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.

 51 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution Date
pas_valide Encoding - ASCII 26% 56168 5 Xartrick 10 4 December 2012
pas_valide Encoding - UU 21% 43830 5 g0uZ 10 7 October 2006
pas_valide Hash - Message Digest 5 21% 44075 5 g0uZ 7 31 January 2010
pas_valide Hash - SHA-2 11% 22659 5 koma 4 3 June 2012
pas_valide Shift cipher 7% 13830 10 m31z0nyx 9 16 February 2011
pas_valide Pixel Madness 6% 10917 15 Ryscrow 10 3 February 2011
pas_valide ELF64 - PID encryption 3% 5715 15 Lu33Y 10 8 February 2012
pas_valide File - PKZIP 4% 8138 15 g0uZ 6 30 August 2010
pas_valide Monoalphabetic substitution - Caesar 5% 10257 15 Arod 5 22 October 2011
pas_valide Known plaintext - XOR 3% 6121 20 Ryscrow 5 3 February 2011
pas_valide Code - Pseudo Random Number Generator 2% 2380 20 Tosh 5 19 December 2012
pas_valide File - Insecure storage 1 3% 6347 20 g0uZ 6 6 February 2012
pas_valide Polyalphabetic substitution - Vigenère 4% 6815 20 Arod 3 26 October 2011
pas_valide System - Android lock pattern 3% 4473 20 Silentd 4 23 December 2012
pas_valide Transposition - Rail Fence 2% 4158 20 YellowS4 3 6 April 2014
pas_valide AES - CBC - Bit-Flipping Attack 1% 806 25 Tie21 3 17 June 2018
pas_valide AES - ECB 1% 1708 25 cez40 4 29 November 2015
pas_valide LFSR - Known plaintext 1% 534 25 Brissouille 1 28 November 2017
pas_valide RSA - Factorisation 2% 2914 25 HacKSpider 5 12 September 2010
pas_valide RSA - Decipher Oracle 1% 1015 25 Zweisamkeit 3 11 May 2017
pas_valide Service - Timing attack 1% 1919 25 g0uZ 4 28 October 2012
pas_valide Monoalphabetic substitution - Polybe 2% 2438 25 koma 6 6 December 2011
pas_valide Twisted secret 1% 157 25 NonStandardModel 1 14 August 2020
pas_valide Initialisation Vector 1% 1311 25 manticore 5 25 August 2015
pas_valide GEDEFU 1% 425 30 makhno 1 13 September 2016
pas_valide OTP - Implementation error 1% 13 30 Podalirius 2 22 March 2021
pas_valide RSA - Corrupted key 1 1% 251 30 blackndoor 2 28 November 2017
pas_valide RSA - Continued fractions 1% 978 30 sambecks 1 8 September 2015
pas_valide RSA - Common modulus 1% 1074 30 franb 2 24 December 2016
pas_valide Service - Hash length extension attack 1% 666 30 koma 1 19 August 2015
pas_valide AES - 4 Rounds 1% 180 35 Cryptanalyse 0 5 September 2018
pas_valide ECDSA - Introduction 1% 158 35 Jrmbt 2 22 September 2019
pas_valide RSA - Padding 1% 188 35 Tosh 0 9 October 2016
pas_valide RSA - Signature 1% 79 35 s4r 1 9 March 2020
pas_valide AES128 - CTR 1% 490 40 Tosh 2 28 August 2015
pas_valide Discrete logarithm problem 1% 726 40 RFC4949 3 8 June 2014
pas_valide RSA - Corrupted key 2 1% 167 40 blackndoor 0 11 January 2018
pas_valide RSA - Corrupted key 3 1% 87 40 blackndoor 0 5 September 2019
pas_valide RSA - Multiple recipients 1% 896 40 franb 3 29 November 2015
pas_valide AES - Fault attack #1 1% 95 50 Cryptanalyse 1 20 September 2018
pas_valide Enigma Machine 1% 162 50 peyman 2 12 October 2016
pas_valide ECDHE 1% 160 60 Tosh 2 20 November 2016
pas_valide RSA - Lee cooper 1% 75 60 blackndoor 1 7 November 2019
pas_valide Service - CBC Padding 1% 855 60 koma 1 4 October 2012
pas_valide Polyalphabetic substitution - One Time Pad 1% 312 60 Thanat0s 0 2 June 2013
pas_valide White-Box Cryptography 1% 122 60 Cryptanalyse 3 21 October 2018
pas_valide AES - Weaker variant 1% 80 70 Cryptanalyse 1 29 August 2018
pas_valide Hash - SHA-3 1% 108 75 Revenger 1 10 December 2016
pas_valide AES - Fault attack #2 1% 69 80 Cryptanalyse 1 20 September 2018
pas_valide AES-PMAC 1% 14 100 Cryptanalyse 0 26 May 2019
pas_valide ECDSA - Implementation error 1% 22 100 Tosh 0 29 September 2019

Challenge Results Challenge Results

Pseudo Challenge Lang Date
Gazed   ELF64 - PID encryption 21 April 2021 at 16:01
zbyszkok   File - PKZIP 21 April 2021 at 15:54
Emma   Chiffrement par décalage 21 April 2021 at 15:54
MoMVO   Chiffrement par décalage 21 April 2021 at 15:53
h4lt0d3   Shift cipher 21 April 2021 at 15:44
s8ght   Hash - SHA-2 21 April 2021 at 15:32
Ybu   Hash - Message Digest 5 21 April 2021 at 15:21
D0pp3lgang3r   Transposition - Rail Fence 21 April 2021 at 15:00
h4lt0d3   Hash - SHA-2 21 April 2021 at 14:57
XioniX   File - Insecure storage 1 21 April 2021 at 14:55