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 70 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution Date
pas_valide Encoding - ASCII 26% 87863 5 Xartrick 10 4 December 2012
pas_valide Encoding - UU 20% 67742 5 g0uZ 10 7 October 2006
pas_valide Hash - DCC 3% 7343 5 Podalirius 1 13 July 2021
pas_valide Hash - DCC2 2% 6804 5 Podalirius 1 13 July 2021
pas_valide Hash - LM 3% 7289 5 Podalirius 1 13 July 2021
pas_valide Hash - Message Digest 5 18% 59881 5 g0uZ 7 31 January 2010
pas_valide Hash - NT 2% 5854 5 Podalirius 1 13 July 2021
pas_valide Hash - SHA-2 10% 31478 5 koma 4 3 June 2012
pas_valide Shift cipher 6% 19903 10 m31z0nyx 10 16 February 2011
pas_valide CISCO - Salted Password 2% 4780 10 Tidusrose 3 13 July 2021
pas_valide Pixel Madness 5% 15568 15 Ryscrow 10 3 February 2011
pas_valide ELF64 - PID encryption 3% 7716 15 Lu33Y 10 8 February 2012
pas_valide File - PKZIP 4% 12511 15 g0uZ 6 30 August 2010
pas_valide Monoalphabetic substitution - Caesar 5% 15843 15 Arod 5 22 October 2011
pas_valide Circular Bit Shift 1% 1103 20 BlackRaven 3 21 March 2023
pas_valide Known plaintext - XOR 3% 8767 20 Ryscrow 5 3 February 2011
pas_valide Code - Pseudo Random Number Generator 1% 3399 20 Tosh 6 19 December 2012
pas_valide Encoding - Codebook 1% 311 20 n3rada 1 21 March 2023
pas_valide File - PKZIP 2 1% 36 20 kevin.mille 1 8 November 2024
pas_valide File - Insecure storage 1 3% 9011 20 g0uZ 7 6 February 2012
pas_valide Polyalphabetic substitution - Vigenère 3% 10044 20 Arod 3 26 October 2011
pas_valide System - Android lock pattern 2% 6626 20 Silentd 5 23 December 2012
pas_valide Transposition - Rail Fence 2% 6206 20 YellowS4 4 6 April 2014
pas_valide AES - CBC - Bit-Flipping Attack 1% 1599 25 Tie21 5 17 June 2018
pas_valide AES - ECB 1% 2588 25 cez40 4 29 November 2015
pas_valide AES - ECB - Copy Paste 1% 256 25 Vozec 1 5 February 2024
pas_valide LFSR - Known plaintext 1% 996 25 Brissouille 2 28 November 2017
pas_valide RSA - Factorisation 2% 4741 25 HacKSpider 5 12 September 2010
pas_valide RSA - Decipher Oracle 1% 1943 25 Zweisamkeit 4 11 May 2017
pas_valide Service - Timing attack 1% 2804 25 g0uZ , koma 4 28 October 2012
pas_valide Monoalphabetic substitution - Polybe 2% 3769 25 koma 6 6 December 2011
pas_valide Twisted secret 1% 467 25 NonStandardModel 1 14 August 2020
pas_valide Initialisation Vector 1% 2137 25 manticore , notfound404 6 25 August 2015
pas_valide Hill Cipher 1% 185 30 LetMeR00t 0 21 March 2023
pas_valide GEDEFU 1% 560 30 makhno 1 13 September 2016
pas_valide OTP - Implementation error 1% 429 30 Podalirius 3 22 March 2021
pas_valide RSA - Corrupted key 1 1% 428 30 blackndoor 2 28 November 2017
pas_valide RSA - Continued fractions 1% 1416 30 sambecks 1 8 September 2015
pas_valide RSA - Common modulus 1% 1943 30 franb 3 24 December 2016
pas_valide Service - Hash length extension attack 1% 1148 30 koma 1 19 August 2015
pas_valide Shamir Secret Sharing - Introduction 1% 252 30 Vozec 1 5 February 2024
pas_valide AES - 4 Rounds 1% 339 35 Cryptanalyse 0 5 September 2018
pas_valide ECDSA - Introduction 1% 304 35 Jrmbt 2 22 September 2019
pas_valide RSA - Padding 1% 281 35 Tosh 0 9 October 2016
pas_valide RSA - Signature 1% 186 35 sar 1 9 March 2020
pas_valide Shamir Secret Sharing - Traitor 1% 66 35 Vozec 1 5 February 2024
pas_valide AES128 - CTR 1% 685 40 Tosh 2 28 August 2015
pas_valide PHP - mt_rand 1% 147 40 NonStandardModel 0 28 March 2022
pas_valide Discrete logarithm problem 1% 1239 40 RFC4949 3 8 June 2014
pas_valide RSA - Corrupted key 2 1% 311 40 blackndoor 1 11 January 2018
pas_valide RSA - Corrupted key 3 1% 182 40 blackndoor 0 5 September 2019
pas_valide RSA - Multiple recipients 1% 1574 40 franb 4 29 November 2015
pas_valide AES - Fault attack #1 1% 183 50 Cryptanalyse 1 20 September 2018
pas_valide FEAL - Differential Cryptanalysis 1% 43 50 Tosh 0 28 March 2022
pas_valide Enigma Machine 1% 251 50 peyman 2 12 October 2016
pas_valide Side Channel - AES : CPA 1% 72 50 cb34 0 28 March 2022
pas_valide ECDHE 1% 234 60 Tosh 2 20 November 2016
pas_valide RSA - H-rabin 1% 77 60 Vozec 0 21 March 2023
pas_valide RSA - Lee cooper 1% 153 60 blackndoor , Synacktiv 1 7 November 2019
pas_valide Service - CBC Padding 1% 1307 60 koma 1 4 October 2012
pas_valide Side Channel - AES : first round 1% 73 60 walafc0 0 28 March 2022
pas_valide Polyalphabetic substitution - One Time Pad 1% 375 60 Thanat0s 0 2 June 2013
pas_valide White-Box Cryptography 1% 230 60 Cryptanalyse 3 21 October 2018
pas_valide AES - Weaker variant 1% 135 70 Cryptanalyse 1 29 August 2018
pas_valide Shamir Secret Sharing - Reduction 1% 35 70 Vozec 0 5 February 2024
pas_valide Hash - SHA-3 1% 154 75 Revenger 1 10 December 2016
pas_valide AES - Fault attack #2 1% 130 80 Cryptanalyse 1 20 September 2018
pas_valide Shamir Secret Sharing - Irreducible ? 1% 26 90 Mister7F 0 5 February 2024
pas_valide AES-PMAC 1% 37 100 Cryptanalyse 0 26 May 2019
pas_valide ECDSA - Implementation error 1% 61 100 Tosh 0 29 September 2019

Challenge Results Challenge Results

Pseudo Challenge Lang Date
Nathan Cryptanalyse  Code - Pseudo Random Number Generator fr 13 November 2024 at 11:38
Pl0uf Cryptanalyse  Substitution monoalphabétique - César fr 13 November 2024 at 11:35
jrjgjk Cryptanalyse  Fichier - PKZIP 2 fr 13 November 2024 at 11:00
Franciscoco Cryptanalyse  Fichier - PKZIP 2 fr 13 November 2024 at 10:58
Rhapsoody Cryptanalysis  File - PKZIP en 13 November 2024 at 10:52
merongida Cryptanalyse  Hash - Message Digest 5 fr 13 November 2024 at 10:52
Nathan Cryptanalyse  Décomposition pixelisée fr 13 November 2024 at 10:40
Orlex Cryptanalyse  Substitution monoalphabétique - César fr 13 November 2024 at 10:31
Nathan Cryptanalyse  Clair connu - XOR fr 13 November 2024 at 10:25
thargis Cryptanalyse  Hash - SHA-2 fr 13 November 2024 at 10:07