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.

 56 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution Date
pas_valide AES - 4 Rounds 1% 190 35 Cryptanalyse 0 5 September 2018
pas_valide AES - CBC - Bit-Flipping Attack 1% 880 25 Tie21 3 17 June 2018
pas_valide AES - ECB 1% 1776 25 cez40 4 29 November 2015
pas_valide AES - Fault attack #1 1% 103 50 Cryptanalyse 1 20 September 2018
pas_valide AES - Fault attack #2 1% 72 80 Cryptanalyse 1 20 September 2018
pas_valide AES - Weaker variant 1% 84 70 Cryptanalyse 1 29 August 2018
pas_valide AES-PMAC 1% 16 100 Cryptanalyse 0 26 May 2019
pas_valide AES128 - CTR 1% 504 40 Tosh 2 28 August 2015
pas_valide CISCO - Salted Password 1% 13 10 Tidusrose 1 13 July 2021
pas_valide Code - Pseudo Random Number Generator 2% 2464 20 Tosh 6 19 December 2012
pas_valide Discrete logarithm problem 1% 758 40 RFC4949 3 8 June 2014
pas_valide ECDHE 1% 166 60 Tosh 2 20 November 2016
pas_valide ECDSA - Implementation error 1% 27 100 Tosh 0 29 September 2019
pas_valide ECDSA - Introduction 1% 174 35 Jrmbt 2 22 September 2019
pas_valide ELF64 - PID encryption 3% 5864 15 Lu33Y 10 8 February 2012
pas_valide Encoding - ASCII 26% 58415 5 Xartrick 10 4 December 2012
pas_valide Encoding - UU 21% 45494 5 g0uZ 10 7 October 2006
pas_valide Enigma Machine 1% 169 50 peyman 2 12 October 2016
pas_valide File - Insecure storage 1 3% 6534 20 g0uZ 6 6 February 2012
pas_valide File - PKZIP 4% 8434 15 g0uZ 6 30 August 2010
pas_valide GEDEFU 1% 436 30 makhno 1 13 September 2016
pas_valide Hash - DCC 1% 243 5 Shutdown 1 13 July 2021
pas_valide Hash - DCC2 1% 244 5 Shutdown 1 13 July 2021
pas_valide Hash - LM 1% 298 5 Shutdown 1 13 July 2021
pas_valide Hash - Message Digest 5 21% 45560 5 g0uZ 7 31 January 2010
pas_valide Hash - NT 1% 224 5 Shutdown 1 13 July 2021
pas_valide Hash - SHA-2 11% 23474 5 koma 4 3 June 2012
pas_valide Hash - SHA-3 1% 111 75 Revenger 1 10 December 2016
pas_valide Initialisation Vector 1% 1379 25 manticore 5 25 August 2015
pas_valide Known plaintext - XOR 3% 6324 20 Ryscrow 5 3 February 2011
pas_valide LFSR - Known plaintext 1% 572 25 Brissouille 1 28 November 2017
pas_valide Monoalphabetic substitution - Caesar 5% 10651 15 Arod 5 22 October 2011
pas_valide Monoalphabetic substitution - Polybe 2% 2540 25 koma 6 6 December 2011
pas_valide OTP - Implementation error 1% 102 30 Podalirius 2 22 March 2021
pas_valide Pixel Madness 6% 11326 15 Ryscrow 10 3 February 2011
pas_valide Polyalphabetic substitution - One Time Pad 1% 315 60 Thanat0s 0 2 June 2013
pas_valide Polyalphabetic substitution - Vigenère 4% 7036 20 Arod 3 26 October 2011
pas_valide RSA - Common modulus 1% 1128 30 franb 2 24 December 2016
pas_valide RSA - Continued fractions 1% 1012 30 sambecks 1 8 September 2015
pas_valide RSA - Corrupted key 1 1% 266 30 blackndoor 2 28 November 2017
pas_valide RSA - Corrupted key 2 1% 174 40 blackndoor 1 11 January 2018
pas_valide RSA - Corrupted key 3 1% 92 40 blackndoor 0 5 September 2019
pas_valide RSA - Decipher Oracle 1% 1070 25 Zweisamkeit 3 11 May 2017
pas_valide RSA - Factorisation 2% 3025 25 HacKSpider 5 12 September 2010
pas_valide RSA - Lee cooper 1% 82 60 blackndoor 1 7 November 2019
pas_valide RSA - Multiple recipients 1% 930 40 franb 3 29 November 2015
pas_valide RSA - Padding 1% 192 35 Tosh 0 9 October 2016
pas_valide RSA - Signature 1% 88 35 sar 1 9 March 2020
pas_valide Service - CBC Padding 1% 885 60 koma 1 4 October 2012
pas_valide Service - Hash length extension attack 1% 699 30 koma 1 19 August 2015
pas_valide Service - Timing attack 1% 1981 25 g0uZ 4 28 October 2012
pas_valide Shift cipher 7% 14407 10 m31z0nyx 9 16 February 2011
pas_valide System - Android lock pattern 3% 4677 20 Silentd 4 23 December 2012
pas_valide Transposition - Rail Fence 2% 4342 20 YellowS4 3 6 April 2014
pas_valide Twisted secret 1% 183 25 NonStandardModel 1 14 August 2020
pas_valide White-Box Cryptography 1% 128 60 Cryptanalyse 3 21 October 2018

Challenge Results Challenge Results

Pseudo Challenge Lang Date
CubeEndy   Décomposition pixelisée 27 July 2021 at 00:35
r3d2@   Hash - LM 27 July 2021 at 00:00
pyraun   Hash - LM 26 July 2021 at 23:50
pyraun   Hash - NT 26 July 2021 at 23:48
GBayard   Encodage - UU 26 July 2021 at 23:36
GBayard   Encodage - ASCII 26 July 2021 at 23:31
cloeperrin71   Encoding - ASCII 26 July 2021 at 23:20
Xerox   Encodage - UU 26 July 2021 at 23:14
Xerox   Encodage - ASCII 26 July 2021 at 23:13
hades2000   Hash - Message Digest 5 26 July 2021 at 22:54