full-stack overflow

cryptopals

• 03 Oct 2017

  Let's Implement a Stream Cipher (CTR)!

  Implementing AES in CTR mode, a Stream Cipher, to solve Cryptopals Set 3 Challenge 18.
• 02 Oct 2017

  CBC Padding Oracle

  Exploring a CBC padding oracle in Cryptopals Set 3 Challenge 17.
• 29 Sep 2017

  CBC Bitflipping Attacks

  Even though CBC is more secure than ECB, it is still vulnerable to attacks without taking additional precautions like using a Message Authentication Code (MAC). Cryptopals Set 2 Challenge 16.
• 28 Sep 2017

  PKCS7 Padding Validation

  Yet Another demonstration of why you shouldn't use ECB, even when some random-sized block of padding is prepended to the message. Cryptopals Set 2 Challenge 15.
• 28 Sep 2017

  ECB Byte At a Time (Harder!)

  Yet Another demonstration of why you shouldn't use ECB, even when some random-sized block of padding is prepended to the message. Cryptopals Set 2 Challenge 14.
• 27 Sep 2017

  ECB Cut and Paste

  Another demonstration of why you shouldn't use ECB! Cryptopals Set 2 Challenge 13.
• 26 Sep 2017

  Byte at a Time ECB Decryption

  We demonstrate how to perform ECB decryption one byte at a time, a good demonstration of why ECB should not be used in practice. Instead, use CBC! Cryptopals Set 2 Challenge 12.
• 24 Sep 2017

  An AES CBC/ECB Detection Oracle!

  We implement an ECB/CBC detection oracle for use in future challenges. This solves Cryptopals Set 2 Challenge 11.
• 24 Sep 2017

  Let's Implement Cipher Block Chaining!

  We implement AES-CBC, a more secure mode of AES than ECB, to solve Cryptopals Set 2 Challenge 10.
• 22 Sep 2017

  Let's Implement PKCS7 Padding!

  We implement PKCS7, a commonly used padding in cryptography. And we solve Cryptopals Set 2 Challenge 9!
• 21 Sep 2017

  Let's Detect AES! (AES in ECB Mode)

  We learn how to detect AES encryption when used in its less-secure form, ECB mode. In the process, we solve Cryptopals Set 1 Challenge 8.
• 21 Sep 2017

  Let's Code AES! (AES in ECB Mode)

  As an exercise, we code AES in ECB mode from scratch in JavaScript, and we use the results to solve Cryptopals Set 1 Challenge 7.
• 16 Sep 2017

  Break Repeating-Key XOR

  How is repeating-key XOR is vulnerable to attack. Find out by Solving Cryptopals Set 1 Challenge 6.
• 14 Sep 2017

  Implement Repeating-Key XOR

  Implement Repeating-key XOR, a slightly more secure version of the single-byte XOR cipher, and solve Cryptopals Set 1 Challenge 5.
• 14 Sep 2017

  Detecting The Single-Byte XOR Cipher

  Find the secret text encrypted using a single-byte XOR cipher and solve Cryptopals Set 1 Challenge 4.
• 14 Sep 2017

  Cracking the Single-Byte XOR Cipher

  Find the secret text encrypted using a single-byte XOR cipher and solve Cryptopals Set 1 Challenge 3.
• 14 Sep 2017

  Calculating Fixed XOR

  Calculate a Fixed XOR between two strings and solve Cryptopals Set 1 Challenge 2.
• 14 Sep 2017

  Convert Hexadecimal String to Base-64

  Calculate a Fixed XOR between two strings and solve Cryptopals Set 1 Challenge 1.