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 Encoding - ASCII 26% 87560 5 Xartrick 10 4 December 2012
pas_valide Encoding - UU 20% 67507 5 g0uZ 10 7 October 2006
pas_valide Hash - DCC 3% 7266 5 Podalirius 1 13 July 2021
pas_valide Hash - DCC2 2% 6745 5 Podalirius 1 13 July 2021
pas_valide Hash - LM 3% 7237 5 Podalirius 1 13 July 2021
pas_valide Hash - Message Digest 5 18% 59729 5 g0uZ 7 31 January 2010
pas_valide Hash - NT 2% 5806 5 Podalirius 1 13 July 2021
pas_valide Hash - SHA-2 10% 31391 5 koma 4 3 June 2012
pas_valide Shift cipher 6% 19818 10 m31z0nyx 10 16 February 2011
pas_valide CISCO - Salted Password 2% 4735 10 Tidusrose 3 13 July 2021
pas_valide Pixel Madness 5% 15529 15 Ryscrow 10 3 February 2011
pas_valide ELF64 - PID encryption 3% 7698 15 Lu33Y 10 8 February 2012
pas_valide File - PKZIP 4% 12470 15 g0uZ 6 30 August 2010
pas_valide Monoalphabetic substitution - Caesar 5% 15805 15 Arod 5 22 October 2011
pas_valide Circular Bit Shift 1% 1076 20 BlackRaven 3 21 March 2023
pas_valide Known plaintext - XOR 3% 8741 20 Ryscrow 5 3 February 2011
pas_valide Code - Pseudo Random Number Generator 1% 3382 20 Tosh 6 19 December 2012
pas_valide Encoding - Codebook 1% 308 20 n3rada 1 21 March 2023
pas_valide File - Insecure storage 1 3% 8994 20 g0uZ 7 6 February 2012
pas_valide Polyalphabetic substitution - Vigenère 3% 10013 20 Arod 3 26 October 2011
pas_valide System - Android lock pattern 2% 6600 20 Silentd 5 23 December 2012
pas_valide Transposition - Rail Fence 2% 6184 20 YellowS4 4 6 April 2014
pas_valide AES - CBC - Bit-Flipping Attack 1% 1596 25 Tie21 5 17 June 2018
pas_valide AES - ECB 1% 2584 25 cez40 4 29 November 2015
pas_valide AES - ECB - Copy Paste 1% 252 25 Vozec 1 5 February 2024
pas_valide LFSR - Known plaintext 1% 991 25 Brissouille 2 28 November 2017
pas_valide RSA - Factorisation 2% 4724 25 HacKSpider 5 12 September 2010
pas_valide RSA - Decipher Oracle 1% 1939 25 Zweisamkeit 4 11 May 2017
pas_valide Service - Timing attack 1% 2801 25 g0uZ , koma 4 28 October 2012
pas_valide Monoalphabetic substitution - Polybe 2% 3756 25 koma 6 6 December 2011
pas_valide Twisted secret 1% 466 25 NonStandardModel 1 14 August 2020
pas_valide Initialisation Vector 1% 2131 25 manticore , notfound404 6 25 August 2015
pas_valide Hill Cipher 1% 185 30 LetMeR00t 0 21 March 2023
pas_valide GEDEFU 1% 559 30 makhno 1 13 September 2016
pas_valide OTP - Implementation error 1% 423 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% 1412 30 sambecks 1 8 September 2015
pas_valide RSA - Common modulus 1% 1939 30 franb 3 24 December 2016
pas_valide Service - Hash length extension attack 1% 1146 30 koma 1 19 August 2015
pas_valide Shamir Secret Sharing - Introduction 1% 248 30 Vozec 1 5 February 2024
pas_valide AES - 4 Rounds 1% 337 35 Cryptanalyse 0 5 September 2018
pas_valide ECDSA - Introduction 1% 303 35 Jrmbt 2 22 September 2019
pas_valide RSA - Padding 1% 281 35 Tosh 0 9 October 2016
pas_valide RSA - Signature 1% 185 35 sar 1 9 March 2020
pas_valide Shamir Secret Sharing - Traitor 1% 64 35 Vozec 1 5 February 2024
pas_valide AES128 - CTR 1% 685 40 Tosh 2 28 August 2015
pas_valide PHP - mt_rand 1% 146 40 NonStandardModel 0 28 March 2022
pas_valide Discrete logarithm problem 1% 1236 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% 181 40 blackndoor 0 5 September 2019
pas_valide RSA - Multiple recipients 1% 1569 40 franb 4 29 November 2015
pas_valide AES - Fault attack #1 1% 182 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% 70 50 cb34 0 28 March 2022
pas_valide ECDHE 1% 233 60 Tosh 2 20 November 2016
pas_valide RSA - H-rabin 1% 75 60 Vozec 0 21 March 2023
pas_valide RSA - Lee cooper 1% 152 60 blackndoor , Synacktiv 1 7 November 2019
pas_valide Service - CBC Padding 1% 1303 60 koma 1 4 October 2012
pas_valide Side Channel - AES : first round 1% 71 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% 228 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% 34 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% 24 90 Mister7F 0 5 February 2024
pas_valide AES-PMAC 1% 37 100 Cryptanalyse 0 26 May 2019
pas_valide ECDSA - Implementation error 1% 60 100 Tosh 0 29 September 2019

Challenge Results Challenge Results

Pseudo Challenge Lang Date
raitchu Cryptanalyse  Encodage - ASCII fr 31 October 2024 at 20:40
rether Cryptanalyse  Encodage - Codebook fr 31 October 2024 at 20:07
deiteristia Cryptanalyse  Substitution polyalphabétique - Vigenère fr 31 October 2024 at 20:01
SaraS Cryptanalyse  File - Insecure storage 1 fr 31 October 2024 at 19:28
DarkMK692 Cryptanalysis  Hash - SHA-2 en 31 October 2024 at 19:25
DarkMK692 Cryptanalysis  Hash - Message Digest 5 en 31 October 2024 at 19:14
DarkMK692 Cryptanalysis  Encoding - UU en 31 October 2024 at 19:09
DarkMK692 Cryptanalysis  Encoding - ASCII en 31 October 2024 at 19:04
syndir Cryptanalyse  Hash - NT fr 31 October 2024 at 18:56
syndir Cryptanalyse  Hash - Message Digest 5 fr 31 October 2024 at 18:49