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Cryptographie - partie 1 : chiffrement de César
 
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Chapitre "Cryptographie" - Partie 1 : Le chiffrement de César Plan : César a dit... ; Des chiffres et des lettres ; Modulo ; Chiffrer et déchiffrer ; Espace des clés et attaque ; Algorithmes Exo7. Cours et exercices de mathématiques pour les étudiants. Retrouvez le polycopié sur http://exo7.emath.fr
Views: 118524 Exo7Math
Complément : Fonctions de hachage
 
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Cette vidéo complément présente plus en détails les fonctions de hachage cryptographique. Prérequis : - Connaissances de base en maths - Sécurité 2 : Cryptographie symétrique (https://www.youtube.com/watch?v=pxRU8vgzyq4&t=1s) - Sécurité 4 : Cracker des mots de passe (https://www.youtube.com/watch?v=Z8nGpUOQPaA&feature=youtu.be) Contenu : - Propriétés des fonctions de hachage cryptographique - Différentes fonctions et les tailles des empreintes - Merkle-Damgard - Keccak - Preimage attack - Collision attack
Views: 811 L'informateur
Chiffrement affine : comment coder et décoder un message - arithmétique - spé maths - 💡💡💡
 
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Objectifs: - Savoir utiliser les congruences pour coder un message - Savoir trouver un inverse avec des modulos - Savoir décoder un message http://jaicompris.com/lycee/math/arithmetique/congruence-Z.php 💡💡💡: difficulté: type BAC arithmétique - spé maths - terminale S - mathématiques
Views: 11656 jaicompris Maths
Modelisation Affine
 
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Introduction sur les diagrammes de dispersion, la corrélation linéaire et la régression linéaire
Views: 319 Justine C. Barolet
Sécurité 2 : Cryptographie Symétrique
 
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Dans cette 2e vidéo, je présente la base de la cryptographie symétrique utilisée de nos jours dans la confidentialité des communications. Lien vers la vidéo suivante : https://www.youtube.com/watch?v=MuNyEoU5tSo Prérequis : - Sécurité 1 : Introduction à la Cryptographie (https://www.youtube.com/watch?v=V9bTy0gbXIQ) - Encodage de l'information 1 : Représentations binaires (https://www.youtube.com/watch?v=y2e7RuFd5gU&t=389s) Contenu : - Chiffrement de Vernam - Block/Stream ciphers - DES - AES - modes ECB et CBC - RC4 et A5 (brièvement)
Views: 4432 L'informateur
Chiffrement de Hill - coder et décoder un message - matrices et congruences - terminale S spé
 
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Objectifs : - Coder et décoder un message à l'aide d'un chiffrement de Hill - Etudier un exemple de chiffrement polyalphabétique - Calculer avec les matrices - inverse d'une matrice - Calculer avec les congruences Cours de mathématiques, terminale S, spécialité
Views: 2753 jaicompris Maths
Affine Encryption Code
 
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Affine Cipher Code is a method of data encryption. It is stronger than the Caesar Cipher Code. General form of Affine Cipher Function is f(x) = (ax+b) MOD 26. Script and Plan: Dr. Rajib L. Das Personal website: www.rldworld.com
Views: 306 RLD World
Intercepting Messages Solution - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1877 Udacity
Matrices - partie 1 : définition
 
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Chapitre "Matrices" - Partie 1 : Définition Plan : Définition ; Matrices particulières ; Addition de matrices ; Exo7. Cours et exercices de mathématiques pour les étudiants. Retrouvez le polycopié sur http://exo7.emath.fr
Views: 305285 Exo7Math
Primitive Roots Solution - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 676 Udacity
Affine Functions-English-EPIGNOSIS CENTER
 
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I welcome you to this training on Linear Functions. My name is Joan Mouba, I am trainer at Epignosis Center, Epignosis Center is a training center that aims to make the complex concepts of mathematics and computer science, accessible and easy to understand.
Views: 1330 Joan MOUBA
Hill Cipher in Hindi – Complete Algorithm with Example
 
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Hill Cipher in Hindi – Complete Algorithm with Example Like FB Page - https://www.facebook.com/Easy-Engineering-Classes-346838485669475/ Complete Data Structure Videos - https://www.youtube.com/playlist?list=PLV8vIYTIdSna11Vc54-abg33JtVZiiMfg Complete Java Programming Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbL_fSaqiYpPh-KwNCavjIr Previous Years Solved Questions of Java - https://www.youtube.com/playlist?list=PLV8vIYTIdSnajIVnIOOJTNdLT-TqiOjUu Complete DBMS Video Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnYZjtUDQ5-9siMc2d8YeoB4 Previous Year Solved DBMS Questions - https://www.youtube.com/playlist?list=PLV8vIYTIdSnaPiMXU2bmuo3SWjNUykbg6 SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnb7av5opUF2p3Xv9CLwOfbq PL-SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnadFpRMvtA260-3-jkIDFaG Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4
substitution ciphers
 
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substituation ciphers polygraphic ciphers polyalphabetic ciphers example of each case....... submitted as a part of class activity at Christ University Computer Science Department MCA- 3rd sem for the paper Computer Networks
Views: 36136 valent pawar
Matrices et applications linéaires - partie 4 : changement de bases
 
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Chapitre "Matrices et applications linéaires" - Partie 4 : Changement de bases Plan : Application linéaire, matrice, vecteur ; Matrice de passage d'une base à une autre ; Formule de changement de base ; Matrices semblables Exo7. Cours et exercices de mathématiques pour les étudiants. Retrouvez le polycopié sur http://exo7.emath.fr
Views: 89713 Exo7Math
Python - Les fonctions
 
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Création et manipulation des fonctions sous Python
Views: 490 Stéphane Nédélec
Cryptography semantic Security
 
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Cryptography semantic Security To get certificate subscribe: https://www.coursera.org/learn/crypto Playlist URL: https://www.youtube.com/playlist?list=PL2jykFOD1AWYosqucluZghEVjUkopdD1e About this course: Cryptography is an indispensable tool for protecting information in computer systems. In this course you will learn the inner workings of cryptographic systems and how to correctly use them in real-world applications. The course begins with a detailed discussion of how two parties who have a shared secret key can communicate securely when a powerful adversary eavesdrops and tampers with traffic. We will examine many deployed protocols and analyze mistakes in existing systems. The second half of the course discusses public-key techniques that let two parties generate a shared secret key.
Views: 573 intrigano
Décomposer en un produit de facteurs premiers - Troisième
 
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Dans cette vidéo, tu pourras apprendre à décomposer en un produit de facteurs premiers. 👍 Site officiel : http://www.maths-et-tiques.fr Twitter : https://twitter.com/mtiques Facebook : https://www.facebook.com/mathsettiques/ Instagram : https://www.instagram.com/yvanmonka/
Views: 76086 Yvan Monka
Terminale S-Spécialité-Antilles septembre 2015 - sujet bac-chiffrement affine bézout
 
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Terminale S-Spécialité-Antilles septembre 2015 - sujet bac-chiffrement affine bézout - C'est un sujet assez simple .
Méthode de calcul de la complexité d'un algorithme | Rachid Guerraoui
 
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Cette leçon donne une méthode pratique pour déterminer la complexité d'un algorithme. Elle consiste à voir comment l'algorithme évolue en augmentant la taille du paramètre n de l'algorithme. Intervenant: Rachid GUERRAOUI Edition: El Mahdi EL MHAMDI
Views: 108526 Wandida, EPFL
Cryptanalysis
 
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Views: 3133 Internetwork Security
La Magie des Maths de Prépa (1/2) - L'algèbre
 
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Dans cette série, je propose de vous révéler la magie des mathématiques des classes préparatoires aux Grandes Écoles. Ce premier épisode porte sur l'algèbre. Voici le second : https://www.youtube.com/watch?v=DRciHKXWneA. Visiter la chaîne francophone de Science4All :https://www.youtube.com/channel/UC0NCbj8CxzeCGIF6sODJ-7A Chapitre 1 - Al-Jabr (1:13) Chapitre 2 - La géométrie algébrique (12:11) Chapitre 3 - La théorie des nombres (17:51) Chapitre 4 - L'algèbre moderne (29:04) Chapitre 5 - L'algèbre linéaire (40:51) Aidez-moi à m'améliorer en remplissant le questionnaire suivant : https://docs.google.com/forms/d/1asI9wJ1jrnMWjpWaO29XvORSIK-ZQD0G_Ivt5m-It5M/viewform?usp=send_form https://docs.google.com/forms/d/1asI9wJ1jrnMWjpWaO29XvORSIK-ZQD0G_Ivt5m-It5M/viewanalytics Pour en savoir plus, allez-voir ces liens ! La magie de l'algèbre : http://www.science4all.org/le-nguyen-hoang/algebra/ Ellipses, paraboles et hyperboles : http://www.science4all.org/le-nguyen-hoang/ellipses-parabolas-hyperbolas/ Cryptographie et théorie des nombres : http://www.science4all.org/scottmckinney/cryptography-and-number-theory/ Cryptographie et physique quantique : http://www.science4all.org/scottmckinney/cryptography-and-quantum-physics/ P versus NP : http://www.science4all.org/le-nguyen-hoang/pnp/ Théorie de Galois : http://www.science4all.org/le-nguyen-hoang/galois-theory/ Relativité restreinte : http://www.science4all.org/le-nguyen-hoang/spacetime-of-special-relativity/ Relativité générale : http://www.science4all.org/le-nguyen-hoang/spacetime-of-general-relativity/ Algèbre linéaire : http://www.science4all.org/le-nguyen-hoang/linear-algebra/ Programmation linéaire : http://www.science4all.org/le-nguyen-hoang/linear-programming/ Physique quantique : http://www.science4all.org/le-nguyen-hoang/quantum-mechanics/ Merci à toutes les participantes concernées de près ou de loin par ce projet ! Musiques : Jason Shaw (http://www.audionautix.com/index.php) J. Lang, Snowflake, Admiral Bob, Onlymeith, Colab (http://dig.ccmixter.org) Chris Zabriskie, Kevin MacLeod (http://freemusicarchive.org)
Views: 145691 Science4All (english)
Arithmétique - Congruence et clé de contrôle - Bac S - Amérique du nord 2017 - Spé maths 💡💡💡💡
 
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Objectifs: - comprendre une application des congruences aux clés de contrôle qui permettent de détecter des erreurs de frappe lors de saisie 💡💡💡💡: type bac assez difficile arithmétique - spé maths - terminale S - Bac S Amérique du nord 2017 - mathématiques
Views: 2762 jaicompris Maths
Random Oracle Solution - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1310 Udacity
congruence • Savoir calculer avec modulo • Règles à connaitre et erreurs à éviter • arithmétique
 
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Objectifs: - savoir calculer avec des congruences - modulo [n] - Les règles à connaitre , en particulier sur les puissances et équation - Les erreurs à éviter http://www.jaicompris.com/lycee/math/arithmetique/congruence-Z.php mathématiques - terminale S - spécialité maths - arithmétique
Views: 5014 jaicompris Maths
Congruence - Comment déterminer le chiffre des unités de 7^98 - Spé Maths - Terminale S
 
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objectifs: - Savoir calculer avec des congruences et connaitre les règles qu'on a le droit d'utiliser - Savoir utiliser les congruences pour trouver le chiffre des unités http://jaicompris.com/lycee/math/terminaleS-math.php Arithmétique - spé maths - terminale S - mathématiques
Views: 18108 jaicompris Maths
Nombres premiers - Maths - 3e - Les Bons Profs
 
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Un rappel de de 3ème sur les nombres premiers. Où nous trouver ?
Views: 39858 Les Bons Profs
Affine Cipher Encryption Phase - Part 2
 
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This short video consider the Affine Cryptographic Cipher and more importantly the Encryption Phase associated with this cipher.
Views: 854 Maths And Stats
CERIAS Security: Recent Attacks on MD5 3/6
 
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Clip 3/6 Speaker: John Black · University of Colorado at Boulder Cryptology is typically defined as cryptography (the construction of cryptographic algorithms) and cryptanalysis (attacks on these algorithms). Both are important, but the latter is more fun. Cryptographic hash functions are one of the core building blocks within both security protocols and other application domains. In the last few decades a wealth of these functions have been developed, but the two in most widespread usage are MD5 and SHA1. Recently, there has been a great deal of activity regarding the cryptanalysis of MD5. We survey the recent attacks on the MD5 hash function from the modest progress in the mid 90s to the startling recent results instigated by Xiaoyun Wang. We will look at the details of these attacks, some recent improvements, two applications, and discuss the current outlook on cryptographic hashing. For more information go to the Cerias website (http://bit.ly/dsFCBF)
Views: 359 Christiaan008
Théorème des restes chinois et application - arithmétique - spé maths - 💡💡💡💡 - IMPORTANT
 
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Objectifs: - démontrer sur un exemple le théorème des restes chinois - système avec des congruences - savoir utiliser le théorème de Bézout et de Gauss - savoir utiliser le théorème des restes chinois pour traiter un problème concret. http://jaicompris.com/lycee/math/arithmetique/theoreme-gauss.php 💡💡💡💡: difficulté: assez difficile arithmétique - spé maths - terminale S
Views: 19005 jaicompris Maths
Function example: Congruence functions (Screencast 6.1.5)
 
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This video gives another example of function definitions, this time using integer congruence.
Views: 1678 GVSUmath
Identity-Based (Lossy) Trapdoor Functions and Applications.
 
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Talk at eurocrypt 2012. Authors: Mihir Bellare, Eike Kiltz, Chris Peikert, Brent Waters. See http://www.iacr.org/cryptodb/data/paper.php?pubkey=24244
Views: 1154 TheIACR
Cryptanalysis - Boomerang Attack
 
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This scribble-video describes a boomerang attack on FEAL-6. It is a companion to my writeup which can be found here: http://theamazingking.com/crypto-boom.php I recommend that you read through my page on differential cryptanalysis of FEAL-4 first. It will greatly help in understanding this video because I skip over much of the explanation of differentials. Let me know what you think and stay tuned for more cryptanalytic goodness.
Views: 3452 Jon King
Gaël Thomas - Diffusion dans les schémas de Feistel généralisés
 
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Diffusion dans les schémas de Feistel généralisés
Views: 319 Institut Fourier
Solving Linear Congruences with One Unique Solution Solution
 
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Step by step instructions to solve linear congruences with one unique solution.
Views: 4001 Cathy Frey
matrice et évolution • suite • D'après sujet de BAC • spé maths • Terminale S 💡💡💡
 
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Objectifs: - savoir traduire une situation à l'aide de suite et matrice - savoir calculer A^n - savoir étudier U(n+1)=AUn - comportement asymptotique de la suite de matrice: sa limite 💡💡💡: difficulté: normal type BAC http://jaicompris.com/lycee/math/matrice/matrice-suite.php terminale S - exercice type BAC - mathématiques
Views: 5310 jaicompris Maths
Terminale S -spécialité - Asie juin 2016 - Ex4 (2/2) spé -chiffrement de Hill-sujet bac corrigé
 
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Terminale S -spécialité - Asie juin 2016 - Ex4 (2/2) spé -chiffrement de Hill-sujet bac corrigé Partie B matrice codage
What is CRYPTANALYSIS? What does CRYPTANALYSIS mean? CRYPTANALYSIS meaning & explanation
 
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What is CRYPTANALYSIS? What does CRYPTANALYSIS mean? CRYPTANALYSIS meaning - CRYPTANALYSIS pronunciation -CRYPTANALYSIS definition - CRYPTANALYSIS explanation - How to pronounce CRYPTANALYSIS? Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. Cryptanalysis is the study of analyzing information systems in order to study the hidden aspects of the systems. Cryptanalysis is used to breach cryptographic security systems and gain access to the contents of encrypted messages, even if the cryptographic key is unknown. In addition to mathematical analysis of cryptographic algorithms, cryptanalysis includes the study of side-channel attacks that do not target weaknesses in the cryptographic algorithms themselves, but instead exploit weaknesses in their implementation. Even though the goal has been the same, the methods and techniques of cryptanalysis have changed drastically through the history of cryptography, adapting to increasing cryptographic complexity, ranging from the pen-and-paper methods of the past, through machines like the British Bombes and Colossus computers at Bletchley Park in World War II, to the mathematically advanced computerized schemes of the present. Methods for breaking modern cryptosystems often involve solving carefully constructed problems in pure mathematics, the best-known being integer factorization.
Views: 2590 The Audiopedia
cryptography - CPA Secure Encryption from PRFs Block Ciphers
 
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Cryptography To get certificate subscribe: https://www.coursera.org/learn/cryptography ======================== Playlist URL: https://www.youtube.com/playlist?list=PL2jykFOD1AWb07OLBdFI2QIHvPo3aTTeu ============================ Youtube channel: https://www.youtube.com/user/intrigano ============================ https://scsa.ge/en/online-courses/ https://www.facebook.com/cyberassociation/
Views: 987 intrigano
The Natural Riemann Surface Structure on an Algebraic Affine Nonsingular Plane Curve
 
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An Introduction to Riemann Surfaces and Algebraic Curves: Complex 1-Tori and Elliptic Curves by Dr. T.E. Venkata Balaji, Department of Mathematics, IIT Madras. For more details on NPTEL visit http://www.nptel.iitm.ac.in/syllabus/111106044/ Goals of Lecture 44: * To show that the graph of a holomorphic function is naturally a Riemann surface embedded in complex affine 2-space * To use the Implicit Function Theorem to show that the zero locus of a nonsingular polynomial in two complex variables is naturally a Riemann surface embedded in complex affine 2-space * To show that the elliptic algebraic affine cubic plane curve associated to a punctured complex torus, as described in the previous lecture, has a natural Riemann surface structure which is holomorphically isomorphic to the natural Riemann surface structure on the punctured complex torus (inherited from the complex torus) Keywords for Lecture 44: Upper half-plane, complex torus associated to a lattice (or) grid in the plane, fundamental parallelogram associated to a lattice, doubly-periodic meromorphic function (or) elliptic function associated to a lattice, Weierstrass phe-function associated to a lattice, ordinary differential equation satisfied by the Weierstrass phe-function, zeros of the derivative of the Weierstrass phe-function, pole of order two (or) double pole with residue zero, triple pole (or) pole of order three, cubic equation, elliptic algebraic cubic curve, zeros of a polynomial equation, bicontinuous map (or) homeomorphism, open map, order of an elliptic function, elliptic integral, Argument principle, even function, odd function, analytic branch of the square root, simply connected, punctured torus, elliptic algebraic affine cubic plane curve, projective plane cubic curve, complex affine two-space, complex projective two-space, one-point compactification by adding a point at infinity, Implicit function theorem, graph of a holomorphic function, nonsingular (or) smooth polynomial in two variables, zero locus of a polynomial, solving an implicit equation locally for an explicit function, nonsingular (or) smooth point of the zero locus of a polynomial in two variables, Hausdorff, second countable, connected component, nonsingular cubic polynomial, discriminant of a polynomial, cubic discriminant
Views: 1120 nptelhrd
Applied Cryptography: The Permutation Cipher
 
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Previos video: https://youtu.be/nQGh3e_Wa4A Next video: https://youtu.be/BmK2wBMc1mA
Views: 5774 Leandro Junes
What is REMOTE KEYLESS SYSTEM? What does REMOTE KEYLESS SYSTEM mean?
 
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What is REMOTE KEYLESS SYSTEM? What does REMOTE KEYLESS SYSTEM mean? REMOTE KEYLESS SYSTEM meaning - REMOTE KEYLESS SYSTEM definition - REMOTE KEYLESS SYSTEM explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. A keyless entry system is an electronic lock that controls access to a building or vehicle without using a traditional mechanical key. The term keyless entry system originally meant a lock controlled by a keypad located at or near the driver's door, that required pressing a predetermined (or self-programmed) numeric code for entry. These systems, having evolved into a hidden touch-activated keypad, are still available on certain Ford or Lincoln models. The term remote keyless system (RKS), also called keyless entry or remote central locking, refers to a lock that uses an electronic remote control as a key which is activated by a handheld device or automatically by proximity. Widely used in automobiles, an RKS performs the functions of a standard car key without physical contact. When within a few yards of the car, pressing a button on the remote can lock or unlock the doors, and may perform other functions. A remote keyless system can include both a remote keyless entry system (RKE), which unlocks the doors, and a remote keyless ignition system (RKI), which starts the engine. Keyless remotes contain a short-range radio transmitter, and must be within a certain range, usually 5–20 meters, of the car to work. When a button is pushed, it sends a coded signal by radio waves to a receiver unit in the car, which locks or unlocks the door. Most RKEs operate at a frequency of 315 MHz for North America-made cars and at 433.92 MHz for European, Japanese and Asian cars. Modern systems since the mid-1990s implement encryption as well as rotating entry codes to prevent car thieves from intercepting and spoofing the signal. Earlier systems used infrared instead of radio signals to unlock the vehicle, such as systems found on Mercedes-Benz, BMW and other manufacturers. The system signals that it has either locked or unlocked the car usually through some fairly discreet combination of flashing vehicle lamps, a distinctive sound other than the horn, or some usage of the horn itself. A typical setup on cars is to have the horn or other sound chirp twice to signify that the car has been unlocked, and chirp once to indicate the car has been locked. For example, Toyota, Scion, and Lexus use a chirp system to signify the car being locked/unlocked. While two beeps means that driver's door is unlocked, four beeps means all doors are unlocked. One long beep is for the trunk or power tailgate. One short beep signifies that the car is locked and alarm is set. The functions of a remote keyless entry system are contained on a key fob or built into the ignition key handle itself. Buttons are dedicated to locking or unlocking the doors and opening the trunk or tailgate. On some minivans, the power sliding doors can be opened/closed remotely. Some cars will also close any open windows and roof when remotely locking the car. Some remote keyless fobs also feature a red panic button which activates the car alarm as a standard feature. Further adding to the convenience, some cars' engines with remote keyless ignition systems can be started by the push of a button on the key fob (useful in cold weather), and convertible tops can be raised and lowered from outside the vehicle while it's parked.
Views: 907 The Audiopedia
Carlo Gasbarri: Arithmetic of algebraic points on varieties over function fields - Part 1
 
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Find this video and other talks given by worldwide mathematicians on CIRM's Audiovisual Mathematics Library: http://library.cirm-math.fr. And discover all its functionalities: - Chapter markers and keywords to watch the parts of your choice in the video - Videos enriched with abstracts, bibliographies, Mathematics Subject Classification - Multi-criteria search by author, title, tags, mathematical area We will explain some results about the arithmetic structure of algebraic points over a variety defined over a function fields in one variable. In particular we will introduce the weak and strong Vojta conjectures and explain some consequences of them. We will expose some recent developments on the subject : Curves, Varieties with ample cotangent bundle, curves in positive characteirstic, hypersurfaces.... If there is time we will explain some analogues over number fields. Recording during the thematic meeting: «On Lang and Vojta's conjectures» the March 03, 2014 at the Centre International de Rencontres Mathématiques (Marseille, France) Filmmaker: Guillaume Hennenfent
Alena Pirutka: Algebraic cycles on varieties over finite fields
 
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Find this video and other talks given by worldwide mathematicians on CIRM's Audiovisual Mathematics Library: http://library.cirm-math.fr. And discover all its functionalities: - Chapter markers and keywords to watch the parts of your choice in the video - Videos enriched with abstracts, bibliographies, Mathematics Subject Classification - Multi-criteria search by author, title, tags, mathematical area Let X be a projective variety over a field k. Chow groups are defined as the quotient of a free group generated by irreducible subvarieties (of fixed dimension) by some equivalence relation (called rational equivalence). These groups carry many information on X but are in general very difficult to study. On the other hand, one can associate to X several cohomology groups which are "linear" objects and hence are rather simple to understand. One then construct maps called "cycle class maps" from Chow groups to several cohomological theories. In this talk, we focus on the case of a variety X over a finite field. In this case, Tate conjecture claims the surjectivity of the cycle class map with rational coefficients; this conjecture is still widely open. In case of integral coefficients, we speak about the integral version of the conjecture and we know several counterexamples for the surjectivity. In this talk, we present a survey of some well-known results on this subject and discuss other properties of algebraic cycles which are either proved or expected to be true. We also discuss several involved methods. Recording during the thematic meeting: ''Arithmetics, geometry, cryptography and coding theory'' » the May 18, 2015 at the Centre International de Rencontres Mathématiques (Marseille, France) Filmmaker: Guillaume Hennenfent
6  Regular Functions
 
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Views: 2247 Harpreet Bedi
Complex Tori are the same as Elliptic Algebraic Projective Curves
 
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An Introduction to Riemann Surfaces and Algebraic Curves: Complex 1-Tori and Elliptic Curves by Dr. T.E. Venkata Balaji, Department of Mathematics, IIT Madras. For more details on NPTEL visit http://www.nptel.iitm.ac.in/syllabus/111106044/ Goals of Lecture 45B: * In Part A of this lecture, we defined complex projective 2-space and showed how it can be turned into a two-dimensional complex manifold. In Part B, we show that any complex torus is holomorphically isomorphic to the natural Riemann surface structure on the associated elliptic algebraic cubic plane projective curve embedded in complex projective 2-space Keywords for Lecture 45B: Upper half-plane, complex torus associated to a lattice (or) grid in the plane, fundamental parallelogram associated to a lattice, doubly-periodic meromorphic function (or) elliptic function associated to a lattice, Weierstrass phe-function associated to a lattice, ordinary differential equation satisfied by the Weierstrass phe-function, zeros of the derivative of the Weierstrass phe-function, pole of order two (or) double pole with residue zero, triple pole (or) pole of order three, cubic equation, elliptic algebraic cubic curve, zeros of a polynomial equation, bicontinuous map (or) homeomorphism, open map, order of an elliptic function, elliptic integral, Argument principle, even function, odd function, analytic branch of the square root, simply connected, punctured torus, elliptic algebraic affine cubic plane curve, projective plane cubic curve, complex affine two-space, complex projective two-space, one-point compactification by adding a point at infinity, Implicit function theorem, graph of a holomorphic function, nonsingular (or) smooth polynomial in two variables, zero locus of a polynomial, solving an implicit equation locally for an explicit function, nonsingular (or) smooth point of the zero locus of a polynomial in two variables, Hausdorff, second countable, connected component, nonsingular cubic polynomial, discriminant of a polynomial, cubic discriminant, homogeneous coordinates on projective 2-space, punctured complex 3-space, quotient topology, open map, complex two-dimensional manifold (or) complex surface, complex one-dimensional manifold (or) Riemann surface, complex coordinate chart in two complex variables, holomorphic (or) complex analytic function of two complex variables, glueing of Riemann surfaces, glueing of complex planes, zero set of a homogeneous polynomial in projective space, degree of homogeneity, Euler's formula for homogeneous functions, homogenisation, dehomogenisation, a complex curve is a real surface, a complex surface is a real 4-manifold
Views: 1968 nptelhrd
Substitution cipher Meaning
 
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Video shows what substitution cipher means. a method of encryption by which units of plaintext are substituted with ciphertext according to a regular system, the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing an inverse substitution.. Substitution cipher Meaning. How to pronounce, definition audio dictionary. How to say substitution cipher. Powered by MaryTTS, Wiktionary
Views: 210 ADictionary
Cryptography 101 - - XOR Cipher
 
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XOR ciphers take advantage of Ascii encoding and basic bit switching operations. They are extremely fast, but not particularly secure when used alone, without a key exchange algorithm. XOR ciphers make up much of the basis of how modern encryption works. More Crypto 101: ADFVGX - https://www.youtube.com/watch?v=Y5-ory-Z25g Pigpen - https://www.youtube.com/watch?v=bUlIvx0fgV8 Homophonic Cipher - https://www.youtube.com/watch?v=sB_3fcO8G24 Vigenère Cipher - https://www.youtube.com/watch?v=QzizXgWGjcM Cracking Substitution Ciphers - https://www.youtube.com/watch?v=p99Wo_rr7OA Caesar shift and Atbash - https://www.youtube.com/watch?v=BbcYLI_3mNA Support me on Patreon if you are into that - https://www.patreon.com/laingsoft
Views: 6505 Charles Laing
Moduli spaces of elliptic curves in toric varieties - Dhruv Ranganathan
 
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Workshop on Homological Mirror Symmetry: Emerging Developments and Applications Topic: Moduli spaces of elliptic curves in toric varieties Speaker: Dhruv Ranganathan Affiliation: IAS Date: March 16, 2017 For more video, visit http://video.ias.edu

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