Search results “Pycrypto aes initialization vector”
Python AES Encryption/Decryption using PyCrypto Tutorial
In this tutorial, we will learn Encryption/Decryption for AES CBC mode using PyCrypto. All links for source code, text based tutorial and further reading material will be in the description below. Detailed Text Based Tutorial http://www.letscodepro.com/encryption-in-python-using-pycrypto/ Gihub Source Code Link https://github.com/the-javapocalypse/Python-File-Encryptor Further Reading Material http://searchsecurity.techtarget.com/definition/cipher https://defuse.ca/cbcmodeiv.htm https://www.di-mgt.com.au/cryptopad.html http://www.cryptofails.com/post/70059609995/crypto-noobs-1-initialization-vectors Please Subscribe! And like. And comment. That's what keeps me going. Follow Me Facebook: https://www.facebook.com/javapocalypse Instagram: https://www.instagram.com/javapocalypse
Views: 11031 Javapocalypse
Encryption: ECB v CBC
http://asecuritysite.com/subjects/chapter58 I forgot to add the key to each of the stages of CBC.
Views: 14963 Bill Buchanan OBE
AskDeveloper Podcast - 47 - Cryptography - Part 2 - Encryption
الحلقة السابقة https://www.youtube.com/watch?v=FcKxlOuGq2U ○ Encryption (Two Ways) § Symmetric Encryption □ Same key both encrypts and decrypts the data. □ Very fast, yet exchanging key is tricky □ Very Algorithmic □ Examples ® DES Data Encryption Standard (BROKEN) ◊ Uses key of 56 bit length ® Triple DES (3DES) ◊ Uses three keys (or two unique keys) of 56 bit each ® AES Advanced Encryption Standard ◊ Uses keys of 128, 192 or 256 bits long □ Attacks ® Brute force ◊ Usually mitigated via increasing key length, as difficulty increases exponentially as key size increases, for example time to crack given a modern super computer. Key Size Time To Crack 56 bits 399 seconds 128 bits 1.02 * 1018 years 192 bits 1.87 * 1037 years 256 bits 3.31 * 1056 years ◊ Side-Channel Attacks § Asymmetric Encryption □ Key pairs have mathematical relationship □ Each one can decrypt messages encrypted by the other. □ Slow, but exchanging key is trivial □ Very Mathematical □ Anyone can know the Public Key ® The Public key can only be used to encrypt data □ The Private key is kept secret, and never leaves the recipient's side. ® The Private key can only be used to decrypt data □ Examples ® RSA (Rivest, Shamir and Adelman) ® The de-facto standard in the industry ® Public and Private keys are based on large Prime Numbers § Hybrid Encryption □ Uses both Symmetric and Asymmetric encryption at the same time. □ Goals: ® Use the performance of Symmetric Crypto ® Convenience of sharing keys using Asymmetric Crypto ® HMAC for authentication. □ Steps: (Order is very important) ® Party 1 (Alice) 1. Generates a random AES Session Key (32 bytes / 256 bits) 2. Generates a random Initialization Vector (IV) (16 bytes / 128 bits) 3. Encrypt the message to be sent using the AES Session Key & IV 4. Calculate an HMAC of the encrypted message using the AES Session key 5. Encrypt the AES Session Key using the Public Key of Party 2 (Bob) The recipient. 6. Sends a packet of (Encrypted Message, Encrypted Session Key, Initialization Vector, and HMAC) to Bob ® Party 2 (Bob) 1. Decrypts Session key using his Private Key 2. Recalculates the HMAC of the encrypted message (Validates message integrity) } If HMAC check pass – Decrypts the message using the decrypted AES Session Key and Initialization Vector } Otherwise, rejects the message because of integrity check failure. Our facebook Page http://facebook.com/askdeveloper On Sound Cloud http://soundcloud.com/askdeveloper Please Like & Subscribe
Views: 687 Mohamed Elsherif
Introduction to Symmetric Encryption using Openssl
Author: Jeremy Druin Twitter: @webpwnized Description: A light introduction to using OpenSSL to symmetrically encrypt text. The AES cipher is used in the sample with a 256 key, a salt and cipher block chaining mode. The sample is decrypted as well. Encryption theory is not discussed. This is only a practical exercise in performing symmetric encryption. Thank you for watching. Please support this channel. Up vote, subscribe or even donate by clicking "Support" at https://www.youtube.com/user/webpwnized!
Views: 1834 webpwnized
Cipher Block Chaining Mode - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 56121 Udacity
Cryptography in Java. 7- CBC AES128 encryption implementation in Java
Hi guys we will learn in this tutorial series about the basics of cryptography and how to implement it in java. We will start with hashing to encryption and then to encoding. In hashing we will be using SHA-1, in ecryption we will focus on AES-128 and for encoding we will use Apache's Base64 encoder and decoder. Here we will implement the Code Block Chaining or CBC algorithim to understand Encryption in Java. We will understand what is IV parameter and what is its purpose and how to implement it here in java. We will also see the decryption in the same.
C# Keywords AES Cryptography (Advanced Encryption Standard) P1
The AES encryption is a symmetric cipher and uses the same key for encryption and decryption. The AES algorithm supports 128, 192 and 256 bit encryption, which is determined from the key size : 128 bit encryption when the key is 16 bytes, 192 when the key is 24 bytes and 256 bit when the key is 32 bytes. The methods provided by the library accept also a string password instead of a key, which is internally converted to a key with a chosen Hash function. The optional initialization vector (IV) size is 16 bytes, which is the block size of the algorithm. This is summarized in the table below: #selfhostwcf, #p2pnetworkprogramming,#netcorecommerce
AES Encryption - شرح بالعربي
شرح كامل لطريقة التشفير باستخدام Advanced Encryption Standard Block Cipher بطريقة مبسطة مع حل مثال. - سيف بدران Information Security and Privacy - AES Block Cipher Encyption Fully Explained with Example. S-AES , Simplified AES Done By: Saif Badran http://www.facebook.com/saif.badran iTeam Academic Group - JU - Convert from block to state. - Add round key - Sub Byte (S-Box) - Shift Rows - Mix columns multiplication (Hexa)
Views: 50720 iAcademy
File Encryption - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1767 Udacity
3   4  1  More attacks on block ciphers 16 min 001
Coursera Cryptography
Views: 48 Marcel van Vuure
Padding Oracle on AES256-CBC Demo
Demo of a Padding Orcle Attack on AES256-CBC encryption
Views: 1245 Earthnuker13
CBC Implementation - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1026 Udacity
What is AES CBC
What is AES CBC - Find out more explanation for : 'What is AES CBC' only from this channel. Information Source: google
Padding (cryptography)
In cryptography, padding refers to a number of distinct practices. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 1475 Audiopedia
cryptography - Padding Oracle Attacks
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: 5055 intrigano
KRACK - Key Reinstallation Attacks: Forcing Nonce Reuse in WPA2
KRACK: https://www.krackattacks.com Read the paper! https://papers.mathyvanhoef.com/ccs2017.pdf Some interesting discussion about the formal protocol verification: https://blog.cryptographyengineering.com/2017/10/16/falling-through-the-kracks/ -------------------------------------- Twitter: https://twitter.com/LiveOverflow Website: http://liveoverflow.com/ Subreddit: https://www.reddit.com/r/LiveOverflow/ Facebook: https://www.facebook.com/LiveOverflow/
Views: 53133 LiveOverflow
Introduction to CBC Bit-Flipping Attack
Author: Jeremy Druin Twitter: @webpwnized Description: This video shows a solution to the view-user-privilege-level in Mutillidae. Before viewing, review how XOR works and more importantly that XOR is communicative (If A xor B = C then it must be true that A xor C = B and also true that B xor C = A). The attack in the video takes advanatage that the attacker knows the IV (initialization vector) and the plaintext (user ID). The attack works by flipping each byte in the IV to see what effect is produced on the plaintext (User ID). When the correct byte is located, the ciphertext for that byte is recovered followed by a determination of the correct byte to inject. The correct value is injected to cause the User ID to change. Mutillidae is available for download at http://sourceforge.net/projects/mutillidae/. Updates about Mutillidae are tweeted to @webpwnized along with annoucements about video releases. Thank you for watching. Please support this channel. Up vote, subscribe or even donate by clicking "Support" at https://www.youtube.com/user/webpwnized!
Views: 5481 webpwnized
2012 UTOSC - Breaking Encryption (Aaron Toponce)
Encryption is used everywhere. It's critical to many infrastructures. It can secure our banking. It can secure our data on our hard drives. It can secure our email and chat communication. However, it can only protect us if it is implemented correctly. If it is implemented incorrectly, it can leak a great deal of information about the data it is supposed to protect. I will show in this presentation what happens when encryption isn't implemented correctly, and how you can leak data out as a result.The topics that will be covered in this presentation are: * Electronic codeblock * Cipherblock chaining * Initialization vectors * Random versus pseudorandom number generators * AES * RSA * LUKS * Snapshot attackThe presentation will cover a scenario where encrypted drives are being stored offsite as backups. We will see how someone at the backup site can mount an attack against the encrypted backups, and potentially recover data, using this King of attacks. By the end of the presentation, system administrators and users should be familiar enough with how to implement encrypted backups correctly, to prevent data leaks.The presentation is mainly targeted at system administrators, but is straight forward enough for beginners. It will provide a number of commands that can be typed at the terminal, and everything will be documented heavily.
Views: 376 Steve Meyers
Secure Messaging with Steganography
This is a presentation I did of a final project for a Applied Cryptography class I did about Secure Messaging with Stenography. I created the application in python, it has a GUI written using Tkinter. The application defends against the following attacks: replay, tampering, chosen ciphertext attack, chosen plaintext attack, known plaintext attack, known ciphertext attack and against an eavesdropper. These are the things I did to try my best to make this application cryptographically secure: a) pseudo-random data properly seeded to he microsecond b) Uses pseudo-random session tokens and time-stamps to protect against replay attacks c) AES-256 in CBC mode to encrypt the messages d) Encrypted message scattered in bits within the image to hide ciphertext (Steganography in action!) e) Every message is uniquely salted (64 bits) and an Initialization Vector, IV, of 128 bits of pseudo-random data f) The shared secret password is never used directly, instead, a derived key is created from it using a Key Derivation Function (KDF) with 10,240 iterations g) Seals integrity and authenticity information to validate the image the ciphertext travels in into a tamper-proof HMAC message sent to the receiver after sending the steganographic image.
Views: 338 Carlos Villegas
security beginner 2 0 certified hacking training monitoring transmitted  4
Programming Education The best and the most extensive Ethical Hacking Training program on the ... Certified experts (CISS, MCSE:MS, CEH, CISSP) have created courses from Beginner to Advanced level. ... Become CISS – Certified IT Security Specialist by covering the following ... Myths #2 - you don't need any protection software or hardware.
Views: 2056 Sliex Official
Google I/O 2010 - Go Programming
Google I/O 2010 - Go Programming Tech Talks Rob Pike, Russ Cox The Go Programming Language was released as an open source project in late 2009. This session will illustrate how programming in Go differs from other languages through a set of examples demonstrating features particular to Go. These include concurrency, embedded types, methods on any type, and program construction using interfaces. Very little time will be spent waiting for compilation. For all I/O 2010 sessions, please go to http://code.google.com/events/io/2010/sessions.html
Views: 94877 Google Developers
DEF CON 23 - Colin Flynn -   Dont Whisper my Chips: Sidechannel and Glitching for Fun and Profit
If you thought the security practices of regular software was bad, just wait until you start learning about the security of embedded hardware systems. Recent open-source hardware tools have made this field accessible to a wider range of researchers, and this presentation will show you how to perform these attacks for equipment costing $200. Attacks against a variety of real systems will be presented: AES-256 bootloaders, internet of things devices, hardware crypto tokens, and more. All of the attacks can be replicated by the attendees, using either their own tools if such equipped (such as oscilloscopes and pulse generators), the open-hardware ChipWhisperer-Lite, or an FPGA board of their own design. The hands-on nature of this talk is designed to introduce you to the field, and give you the confidence to pick up some online tutorials or books and work through them. Even if you've never tried hardware hacking before, the availability of open-source hardware makes it possible to follow published tutorials and learn all about side-channel power analysis and glitching attacks for yourself. Speaker Bio: Colin O'Flynn has been working with security on embedded systems for several years. He has designed the open-source ChipWhisperer project which won 2nd place in the 2014 Hackaday Prize, and developed an even lower-cost version called the ChipWhisperer-Lite, which was the focus of a Kickstarter in 2015. Twitter: @colinoflynn
Views: 7046 DEFCONConference
Defeat 2FA token because of bad randomness - rhme2 Twistword (Misc 400)
Generating random numbers on computers is not easy. And while the intended solution was really hard, the challenge had a problem with the random number generation, which allowed me to solve it. Clarification from Andres Moreno (riscure) on the challenge: "The "official" challenge solution involved reading the tiny Mersenne twister (tinyMT) paper, writing some equations, and using a solver. The tinyMT is tricky to initialize. Giving a proper seed is not enough. You need to provide initial state matrices with certain properties (there is a generator for this). The challenge used improper initialized matrices (zeros) that reduced the PRNG period. During tests, we found that ~12hr were needed to solve the challenge (solver time only), but we did not test the amount of entropy reduction by improper state initialization. Fortunately, the problem was not in the PRNG." -------------------------------------- Twitter: https://twitter.com/LiveOverflow Website: http://liveoverflow.com/ Subreddit: https://www.reddit.com/r/LiveOverflow/
Views: 13876 LiveOverflow
Crypto Defenses for Real-World System Threats - Kenn White - Ann Arbor
Modern encryption techniques provide several important security properties, well known to most practitioners. Or are they? What are in fact the guarantees of, say, HTTPS TLS cipher suites using authenticated encryption, IPSec vs. SSL VPNs, Property Preserving Encryption, or token vaults? We live in an era of embedded Hardware Security Modules that cost less than $1 in volume, and countless options now exist for encrypting streaming network data, files, volumes, and even entire databases. Let's take a deep dive into the edge of developed practice to discuss real-world threat scenarios to public cloud and IoT data, and look closely at how we can address specific technical risks with our current encryption toolkits. Advanced math not required. Bio: Kenneth White is a security researcher whose work focuses on networks and global systems. He is co-director of the Open Crypto Audit Project (OCAP), currently managing a large-scale audit of OpenSSL on behalf of the Linux Foundation's Core Infrastructure Initiative. Previously, White was Principal Scientist at Washington DC-based Social & Scientific Systems where he led the engineering team that designed and ran global operations and security for the largest clinical trial network in the world, with research centers in over 100 countries. White co-founded CBX Group which provides security services to major organizations including World Health, UNICEF, Doctors without Borders, the US State Department, and BAO Systems. Together with Matthew Green, White co-founded the TrueCrypt audit project, a community-driven initiative to conduct the first comprehensive cryptanalysis and public security audit of the widely used TrueCrypt encryption software. White holds a Masters from Harvard and is a PhD candidate in neuroscience and cognitive science, with applied research in real-time classification and machine learning. His work on network security and forensics and been cited by media including the Wall Street Journal, Forbes, Reuters, Wired and Nature. White is a technical reviewer for the Software Engineering Institute, and publishes and speaks frequently on computational modeling, security engineering, and trust. He tweets @kennwhite.
Views: 838 Duo Security
MouseJack: Injecting Keystrokes into Wireless Mice. Marc Newlin explains MouseJack at DEF CON 24
What if your wireless mouse was an effective attack vector? Research reveals this to be the case for mice from Logitech, Microsoft, Dell, Lenovo, Hewlett-Packard, Gigabyte, and Amazon. Dubbed 'MouseJack', this class of security vulnerabilities allows keystroke injection into non-Bluetooth wireless mice. Imagine you are catching up on some work at the airport, and you reach into your laptop bag to pull out your phone charger. As you glance back at your screen, you see the tail end of an ASCII art progress bar followed by your shell history getting cleared. Before you realize what has happened, an attacker has already installed malware on your laptop. Or maybe they just exfiltrated a git repository and your SSH keys. In the time it took you to plug in your phone, you got MouseJacked. The attacker is camped out at the other end of the terminal, equipped with a commodity USB radio dongle and a directional patch antenna hidden in a backpack, and boards her plane as soon as the deed is done. The reality of MouseJack is that an attacker can inject keystrokes into your wireless mouse dongle from over 200 meters away, at a rate of up to 7500 keystrokes per minute (one every 8ms). Most wireless keyboards encrypt the data going between the keyboard and computer in order to deter sniffing, but wireless mouse traffic is generally unencrypted. The result is that wireless mice and keyboards ship with USB dongles that can support both encrypted and unencrypted RF packets. A series of implementation flaws makes it possible for an attacker to inject keystrokes directly into a victim's USB dongle using easily accessible, cheap hardware, in most cases only requiring that the user has a wireless mouse. The majority of affected USB dongles are unpatchable, making it likely that vulnerable computers will be common in the wild for the foreseeable future. This talk will explain the research process that lead to the discovery of these vulnerabilities, covering specific tools and techniques. Results of the research will be detailed, including protocol behavior, packet formats, and technical specifics of each vulnerability. Additional vulnerabilities affecting 14 vendors are currently in disclosure, and will be revealed during this talk. Marc is a security researcher and software engineer at Bastille Networks, where he focuses on RF/IoT threats present in enterprise environments. He has been hacking on software defined radios since 2013, when he competed as a finalist in the DARPA Spectrum Challenge. In 2011, he wrote software to reassemble shredded documents for the DARPA Shredder Challenge, finishing the competition in third place out of 9000 teams. Twitter: @marcnewlin I reuploaded this video with the YouTube Video Editor (http://www.youtube.com/editor) using the Creative commons license video provided by DEF CON.
Create Key and Certification using OpenSSL
Create Key and Certification using OpenSSL the website : http://www.hacksparrow.com/node-js-https-ssl-certificate.html I used it to Create Server in localhost using nodejs so i needed certification and key to do it. the website which i follow to create https server : https://www.hacksparrow.com/express-js-https-server-client-example.html
Views: 1349 Ahmad Al-Weshahi
What is BIT-FLIPPING ATTACK? What does BIT-FLIPPING ATTACK mean? BIT-FLIPPING ATTACK meaning - BIT-FLIPPING ATTACK definition - BIT-FLIPPING ATTACK explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ A bit-flipping attack is an attack on a cryptographic cipher in which the attacker can change the ciphertext in such a way as to result in a predictable change of the plaintext, although the attacker is not able to learn the plaintext itself. Note that this type of attack is not—directly—against the cipher itself (as cryptanalysis of it would be), but against a particular message or series of messages. In the extreme, this could become a Denial of service attack against all messages on a particular channel using that cipher. The attack is especially dangerous when the attacker knows the format of the message. In such a situation, the attacker can turn it into a similar message but one in which some important information is altered. For example, a change in the destination address might alter the message route in a way that will force re-encryption with a weaker cipher, thus possibly making it easier for an attacker to decipher the message. When applied to digital signatures, the attacker might be able to change a promissory note stating "I owe you $10.00" into one stating "I owe you $10000". Stream ciphers, such as RC4, are vulnerable to a bit-flipping attack, as are some block cipher modes of operation. See stream cipher attack. A keyed message authentication code, digital signature, or other authentication mechanism allows the recipient to detect if any bits were flipped in transit.
Views: 688 The Audiopedia
Best macOS Preview App Features
In this video, we're going to go over some of the best features that the macOS Preview app has to offer. Read More - https://www.macrumors.com/how-to/get-the-most-from-the-macos-preview-app
Views: 18533 MacRumors

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