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 60 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution Date
pas_valide Encoding - ASCII 26% 69265 5 Xartrick 10 4 December 2012
pas_valide Encoding - UU 21% 53600 5 g0uZ 10 7 October 2006
pas_valide Hash - DCC 1% 2635 5 Podalirius 1 13 July 2021
pas_valide Hash - DCC2 1% 2597 5 Podalirius 1 13 July 2021
pas_valide Hash - LM 2% 3067 5 Podalirius 1 13 July 2021
pas_valide Hash - Message Digest 5 19% 50555 5 g0uZ 7 31 January 2010
pas_valide Hash - NT 1% 2138 5 Podalirius 1 13 July 2021
pas_valide Hash - SHA-2 10% 26077 5 koma 4 3 June 2012
pas_valide Shift cipher 7% 16171 10 m31z0nyx 10 16 February 2011
pas_valide CISCO - Salted Password 1% 1987 10 Tidusrose 3 13 July 2021
pas_valide Pixel Madness 5% 12734 15 Ryscrow 10 3 February 2011
pas_valide ELF64 - PID encryption 3% 6414 15 Lu33Y 10 8 February 2012
pas_valide File - PKZIP 4% 9762 15 g0uZ 6 30 August 2010
pas_valide Monoalphabetic substitution - Caesar 5% 12484 15 Arod 5 22 October 2011
pas_valide Known plaintext - XOR 3% 7147 20 Ryscrow 5 3 February 2011
pas_valide Code - Pseudo Random Number Generator 2% 2795 20 Tosh 6 19 December 2012
pas_valide File - Insecure storage 1 3% 7404 20 g0uZ 7 6 February 2012
pas_valide Polyalphabetic substitution - Vigenère 4% 8180 20 Arod 3 26 October 2011
pas_valide System - Android lock pattern 3% 5412 20 Silentd 5 23 December 2012
pas_valide Transposition - Rail Fence 2% 5055 20 YellowS4 4 6 April 2014
pas_valide AES - CBC - Bit-Flipping Attack 1% 1109 25 Tie21 4 17 June 2018
pas_valide AES - ECB 1% 2009 25 cez40 4 29 November 2015
pas_valide LFSR - Known plaintext 1% 700 25 Brissouille 2 28 November 2017
pas_valide RSA - Factorisation 2% 3595 25 HacKSpider 5 12 September 2010
pas_valide RSA - Decipher Oracle 1% 1367 25 Zweisamkeit 3 11 May 2017
pas_valide Service - Timing attack 1% 2247 25 g0uZ 4 28 October 2012
pas_valide Monoalphabetic substitution - Polybe 2% 2971 25 koma 6 6 December 2011
pas_valide Twisted secret 1% 281 25 NonStandardModel 1 14 August 2020
pas_valide Initialisation Vector 1% 1598 25 manticore 6 25 August 2015
pas_valide GEDEFU 1% 485 30 makhno 1 13 September 2016
pas_valide OTP - Implementation error 1% 220 30 Podalirius 2 22 March 2021
pas_valide RSA - Corrupted key 1 1% 321 30 blackndoor 2 28 November 2017
pas_valide RSA - Continued fractions 1% 1136 30 sambecks 1 8 September 2015
pas_valide RSA - Common modulus 1% 1372 30 franb 3 24 December 2016
pas_valide Service - Hash length extension attack 1% 842 30 koma 1 19 August 2015
pas_valide AES - 4 Rounds 1% 231 35 Cryptanalyse 0 5 September 2018
pas_valide ECDSA - Introduction 1% 217 35 Jrmbt 2 22 September 2019
pas_valide RSA - Padding 1% 221 35 Tosh 0 9 October 2016
pas_valide RSA - Signature 1% 119 35 sar 1 9 March 2020
pas_valide AES128 - CTR 1% 564 40 Tosh 2 28 August 2015
pas_valide PHP - mt_rand 1% 71 40 NonStandardModel 0 28 March 2022
pas_valide Discrete logarithm problem 1% 880 40 RFC4949 3 8 June 2014
pas_valide RSA - Corrupted key 2 1% 215 40 blackndoor 1 11 January 2018
pas_valide RSA - Corrupted key 3 1% 113 40 blackndoor 0 5 September 2019
pas_valide RSA - Multiple recipients 1% 1114 40 franb 3 29 November 2015
pas_valide AES - Fault attack #1 1% 126 50 Cryptanalyse 1 20 September 2018
pas_valide FEAL - Differential Cryptanalysis 1% 11 50 Tosh 0 28 March 2022
pas_valide Enigma Machine 1% 206 50 peyman 2 12 October 2016
pas_valide Side Channel - AES : CPA 1% 17 50 cb34 0 28 March 2022
pas_valide ECDHE 1% 190 60 Tosh 2 20 November 2016
pas_valide RSA - Lee cooper 1% 101 60 blackndoor 1 7 November 2019
pas_valide Service - CBC Padding 1% 1007 60 koma 1 4 October 2012
pas_valide Side Channel - AES : first round 1% 16 60 walafc0 0 28 March 2022
pas_valide Polyalphabetic substitution - One Time Pad 1% 343 60 Thanat0s 0 2 June 2013
pas_valide White-Box Cryptography 1% 170 60 Cryptanalyse 3 21 October 2018
pas_valide AES - Weaker variant 1% 104 70 Cryptanalyse 1 29 August 2018
pas_valide Hash - SHA-3 1% 124 75 Revenger 1 10 December 2016
pas_valide AES - Fault attack #2 1% 90 80 Cryptanalyse 1 20 September 2018
pas_valide AES-PMAC 1% 22 100 Cryptanalyse 0 26 May 2019
pas_valide ECDSA - Implementation error 1% 43 100 Tosh 0 29 September 2019

Challenge Results Challenge Results

Pseudo Challenge Lang Date
H31s3nb3rg Cryptanalysis  Hash - LM en 29 September 2022 at 10:50
neuveee Cryptanalyse  Fichier - PKZIP fr 29 September 2022 at 10:48
H31s3nb3rg Cryptanalysis  Hash - DCC2 en 29 September 2022 at 10:47
Chris_ts Cryptanalyse  Encodage - ASCII fr 29 September 2022 at 10:47
ben Cryptanalyse  Substitution monoalphabétique - César fr 29 September 2022 at 10:44
√¿ßz Cryptanalyse  Hash - LM fr 29 September 2022 at 10:41
mathman Cryptanalysis  Hash - NT en 29 September 2022 at 10:39
√¿ßz Cryptanalyse  Hash - DCC2 fr 29 September 2022 at 10:35
√¿ßz Cryptanalyse  Hash - DCC fr 29 September 2022 at 10:32
H31s3nb3rg Cryptanalysis  Hash - DCC en 29 September 2022 at 10:32