Cryptanalysis Cryptanalysis

Break encryption algorithms

These tests will allow you to hone your cryptography skills. You will be faced with an encoded data. The challenge is to find the type of encoding or encryption and revert it back to find the solution.

Prerequisites:

– Knowledge of most common encoding formats.
– Knowledge of most common hash algorithms and ciphers.
– Knowledge of a scripting language.

challenges 75 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution Date ↓↑
pas_valide Encoding - UU 20% 71377 5 g0uZ 10 7 October 2006
pas_valide Hash - Message Digest 5 17% 62308 5 g0uZ 7 31 January 2010
pas_valide File - PKZIP 4% 13457 15 g0uZ 6 30 August 2010
pas_valide RSA - Factorisation 2% 5117 25 HacKSpider 5 12 September 2010
pas_valide Known plaintext - XOR 3% 9481 20 Ryscrow 5 3 February 2011
pas_valide Pixel Madness 5% 16433 15 Ryscrow 10 3 February 2011
pas_valide Shift cipher 6% 21171 10 m31z0nyx 10 16 February 2011
pas_valide Monoalphabetic substitution - Caesar 5% 16962 15 Arod 5 22 October 2011
pas_valide Polyalphabetic substitution - Vigenère 3% 10651 20 Arod 3 26 October 2011
pas_valide Monoalphabetic substitution - Polybe 2% 3995 25 koma 6 6 December 2011
pas_valide File - Insecure storage 1 3% 9453 20 g0uZ 7 6 February 2012
pas_valide ELF64 - PID encryption 3% 8179 15 Lu33Y 10 8 February 2012
pas_valide Hash - SHA-2 9% 32915 5 koma 4 3 June 2012
pas_valide Service - CBC Padding 1% 1382 60 koma 2 4 October 2012
pas_valide Service - Timing attack 1% 2942 25 g0uZ , koma 5 28 October 2012
pas_valide Encoding - ASCII 26% 92726 5 Xartrick 10 4 December 2012
pas_valide Code - Pseudo Random Number Generator 2% 3721 20 Tosh 6 19 December 2012
pas_valide System - Android lock pattern 2% 7070 20 Silentd 5 23 December 2012
pas_valide Polyalphabetic substitution - One Time Pad 1% 386 60 Thanat0s 0 2 June 2013
pas_valide Transposition - Rail Fence 2% 6657 20 YellowS4 4 6 April 2014
pas_valide Discrete logarithm problem 1% 1332 40 RFC4949 3 8 June 2014
pas_valide Service - Hash length extension attack 1% 1193 30 koma 1 19 August 2015
pas_valide Initialisation Vector 1% 2303 25 manticore , notfound404 6 25 August 2015
pas_valide AES128 - CTR 1% 736 40 Tosh 2 28 August 2015
pas_valide RSA - Continued fractions 1% 1522 30 s