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 69 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author ↓↑ Note  Notation Solution Date
pas_valide Hash - Message Digest 5 18% 59113 5 g0uZ 7 31 January 2010
pas_valide Encoding - UU 20% 66496 5 g0uZ 10 7 October 2006
pas_valide File - PKZIP 4% 12289 15 g0uZ 6 30 August 2010
pas_valide File - Insecure storage 1 3% 8889 20 g0uZ 7 6 February 2012
pas_valide Known plaintext - XOR 3% 8605 20 Ryscrow 5 3 February 2011
pas_valide Pixel Madness 5% 15303 15 Ryscrow 10 3 February 2011
pas_valide RSA - Factorisation 2% 4643 25 HacKSpider 5 12 September 2010
pas_valide ELF64 - PID encryption 3% 7595 15 Lu33Y 10 8 February 2012
pas_valide ECDSA - Implementation error 1% 56 100 Tosh 0 29 September 2019
pas_valide ECDHE 1% 230 60 Tosh 2 20 November 2016
pas_valide FEAL - Differential Cryptanalysis 1% 41 50 Tosh 0 28 March 2022
pas_valide AES128 - CTR 1% 677 40 Tosh 2 28 August 2015
pas_valide RSA - Padding 1% 276 35 Tosh 0 9 October 2016
pas_valide Code - Pseudo Random Number Generator 1% 3330 20 Tosh 6 19 December 2012
pas_valide Shift cipher 6% 19523 10 m31z0nyx 10 16 February 2011
pas_valide Encoding - ASCII 26% 86210 5 Xartrick 10 4 December 2012
pas_valide GEDEFU 1% 559 30 makhno 1 13 September 2016
pas_valide Monoalphabetic substitution - Caesar 5% 15588 15 Arod 5 22 October 2011
pas_valide Polyalphabetic substitution - Vigenère 3% 9875 20 Arod 3 26 October 2011
pas_valide Side Channel - AES : first round 1% 70 60 walafc0 0 28 March 2022
pas_valide Polyalphabetic substitution - One Time Pad 1% 373 60 Thanat0s 0 2 June 2013
pas_valide Hash - SHA-2 10% 31045 5 koma 4 3 June 2012
pas_valide Monoalphabetic substitution - Polybe 2% 3714 25 koma 6 6 December 2011
pas_valide Service - Hash length extension attack 1% 1143 30 koma 1 19 August 2015
pas_valide Service - CBC Padding 1% 1296 60 koma 1 4 October 2012
pas_valide System - Android lock pattern 2% 6510 20 Silentd 5 23 December 2012
pas_valide RSA - Continued fractions 1% 1387 30 sambecks 1 8 September 2015
pas_valide AES - ECB 1% 2542 25 cez40 4 29 November 2015
pas_valide Transposition - Rail Fence 2% 6106 20 YellowS4 4 6 April 2014
pas_valide AES - CBC - Bit-Flipping Attack 1% 1574 25 Tie21 4 17 June 2018
pas_valide LFSR - Known plaintext 1% 967 25 Brissouille 2 28 November 2017
pas_valide Discrete logarithm problem 1% 1218 40 RFC4949 3 8 June 2014
pas_valide Enigma Machine 1% 249 50 peyman 2 12 October 2016
pas_valide RSA - Corrupted key 3 1% 179 40 blackndoor 0 5 September 2019
pas_valide RSA - Corrupted key 2 1% 305 40 blackndoor 1 11 January 2018
pas_valide RSA - Corrupted key 1 1% 417 30 blackndoor 2 28 November 2017
pas_valide RSA - Common modulus 1% 1897 30 franb 3 24 December 2016
pas_valide RSA - Multiple recipients 1% 1543 40 franb 4 29 November 2015
pas_valide Hill Cipher 1% 174 30 LetMeR00t 0 21 March 2023
pas_valide RSA - Signature 1% 178 35 sar 1 9 March 2020
pas_valide RSA - Decipher Oracle 1% 1896 25 Zweisamkeit 4 11 May 2017
pas_valide Hash - SHA-3 1% 153 75 Revenger 1 10 December 2016
pas_valide ECDSA - Introduction 1% 298 35 Jrmbt 2 22 September 2019
pas_valide Shamir Secret Sharing - Irreducible ? 1% 19 90 Mister7F 0 5 February 2024
pas_valide Hash - DCC 3% 6848 5 Podalirius 1 13 July 2021
pas_valide Hash - DCC2 2% 6387 5 Podalirius 1 13 July 2021
pas_valide OTP - Implementation error 1% 408 30 Podalirius 3 22 March 2021
pas_valide Hash - NT 2% 5507 5 Podalirius 1 13 July 2021
pas_valide Hash - LM 3% 6886 5 Podalirius 1 13 July 2021
pas_valide AES - Fault attack #1 1% 177 50 Cryptanalyse 1 20 September 2018
pas_valide AES-PMAC 1% 36 100 Cryptanalyse 0 26 May 2019
pas_valide AES - 4 Rounds 1% 329 35 Cryptanalyse 0 5 September 2018
pas_valide AES - Fault attack #2 1% 129 80 Cryptanalyse 1 20 September 2018
pas_valide White-Box Cryptography 1% 227 60 Cryptanalyse 3 21 October 2018
pas_valide AES - Weaker variant 1% 131 70 Cryptanalyse 1 29 August 2018
pas_valide Side Channel - AES : CPA 1% 69 50 cb34 0 28 March 2022
pas_valide PHP - mt_rand 1% 144 40 NonStandardModel 0 28 March 2022
pas_valide Twisted secret 1% 457 25 NonStandardModel 1 14 August 2020
pas_valide CISCO - Salted Password 2% 4490 10 Tidusrose 3 13 July 2021
pas_valide Shamir Secret Sharing - Traitor 1% 47 35 Vozec 0 5 February 2024
pas_valide Shamir Secret Sharing - Introduction 1% 216 30 Vozec 1 5 February 2024
pas_valide RSA - H-rabin 1% 68 60 Vozec 0 21 March 2023
pas_valide AES - ECB - Copy Paste 1% 225 25 Vozec 1 5 February 2024
pas_valide Shamir Secret Sharing - Reduction 1% 29 70 Vozec 0 5 February 2024
pas_valide Circular Bit Shift 1% 899 20 BlackRaven 3 21 March 2023
pas_valide Encoding - Codebook 1% 286 20 n3rada 1 21 March 2023
pas_valide Service - Timing attack 1% 2768 25 g0uZ , koma 4 28 October 2012
pas_valide Initialisation Vector 1% 2087 25 manticore , notfound404 6 25 August 2015
pas_valide RSA - Lee cooper 1% 147 60 blackndoor , Synacktiv 1 7 November 2019

Challenge Results Challenge Results

Pseudo Challenge Lang Date
mgrimb Cryptanalyse  RSA - Modules communs fr 15 September 2024 at 21:36
BlackFox Cryptanalysis  Encoding - UU en 15 September 2024 at 21:26
BlackFox Cryptanalysis  Encoding - ASCII en 15 September 2024 at 21:15
tony_frg Cryptanalyse  Chiffrement par décalage fr 15 September 2024 at 20:28
Brtk Cryptanalyse  Code - Pseudo Random Number Generator fr 15 September 2024 at 19:10
Sr_stronium Cryptanalyse  Encodage - ASCII fr 15 September 2024 at 19:04
4D4J Cryptanalyse  Hash - Message Digest 5 fr 15 September 2024 at 18:48
4D4J Cryptanalyse  Encodage - UU fr 15 September 2024 at 18:46
Reborn Cryptanalyse  Hash - DCC2 fr 15 September 2024 at 18:46
Zeirkah Cryptanalyse  Hash - LM fr 15 September 2024 at 18:42