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.

 50 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Monoalphabetic substitution - Caesar 5% 9967 15 Arod 4
pas_valide Polyalphabetic substitution - Vigenère 4% 6604 20 Arod 3
pas_valide LFSR - Known plaintext 1% 510 25 Brissouille 1
pas_valide White-Box Cryptography 1% 117 60 Cryptanalyse 3
pas_valide AES-PMAC 1% 12 100 Cryptanalyse 0
pas_valide AES - Fault attack #2 1% 67 80 Cryptanalyse 1
pas_valide AES - Fault attack #1 1% 91 50 Cryptanalyse 1
pas_valide AES - Weaker variant 1% 76 70 Cryptanalyse 1
pas_valide AES - 4 Rounds 1% 169 35 Cryptanalyse 0
pas_valide RSA - Factorisation 2% 2821 25 HacKSpider 5
pas_valide ECDSA - Introduction 1% 141 35 Jrmbt 2
pas_valide ELF64 - PID encryption 3% 5594 15 Lu33Y 10
pas_valide Twisted secret 1% 133 25 NonStandardModel 1
pas_valide Discrete logarithm problem 1% 702 40 Thanat0s, RFC4949 3
pas_valide Hash - SHA-3 1% 86 75 Revenger 1
pas_valide Known plaintext - XOR 3% 5962 20 Ryscrow 5
pas_valide Pixel Madness 6% 10522 15 Ryscrow 10
pas_valide System - Android lock pattern 3% 4359 20 Silentd 4
pas_valide Polyalphabetic substitution - One Time Pad 1% 306 60 Thanat0s 0
pas_valide AES - CBC - Bit-Flipping Attack 1% 753 25 Tie21 2
pas_valide Code - Pseudo Random Number Generator 2% 2319 20 Tosh 5
pas_valide ECDHE 1% 153 60 Tosh 2
pas_valide AES128 - CTR 1% 478 40 Tosh 2
pas_valide RSA - Padding 1% 184 35 Tosh 0
pas_valide ECDSA - Implementation error 1% 22 100 Tosh 0
pas_valide Encoding - ASCII 26% 54045 5 Xartrick 10
pas_valide Transposition - Rail Fence 2% 4032 20 YellowS4 3
pas_valide RSA - Decipher Oracle 1% 963 25 Zweisamkeit 3
pas_valide RSA - Corrupted key 2 1% 160 40 blackndoor 0
pas_valide RSA - Lee cooper 1% 74 60 blackndoor, Synacktiv 1
pas_valide RSA - Corrupted key 3 1% 80 40 blackndoor 0
pas_valide RSA - Corrupted key 1 1% 240 30 blackndoor 2
pas_valide AES - ECB 1% 1677 25 cez40 4
pas_valide RSA - Common modulus 1% 1024 30 franb 2
pas_valide RSA - Multiple recipients 1% 851 40 franb 3
pas_valide Encoding - UU 21% 42354 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 42681 5 g0uZ 6
pas_valide Service - Timing attack 1% 1860 25 g0uZ, koma 4
pas_valide File - Insecure storage 1 3% 6221 20 g0uZ 6
pas_valide File - PKZIP 4% 7899 15 g0uZ 6
pas_valide Monoalphabetic substitution - Polybe 2% 2348 25 koma 6
pas_valide Service - CBC Padding 1% 833 60 koma 1
pas_valide Service - Hash length extension attack 1% 644 30 koma 1
pas_valide Hash - SHA-2 11% 21982 5 koma 4
pas_valide Shift cipher 7% 13413 10 m31z0nyx 9
pas_valide GEDEFU 1% 416 30 makhno 1
pas_valide Initialisation Vector 1% 1278 25 manticore, notfound404 5
pas_valide Enigma Machine 1% 157 50 peyman 2
pas_valide RSA - Signature 1% 74 35 s4r 1
pas_valide RSA - Continued fractions 1% 951 30 sambecks 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
ooggle   Fichier - PKZIP 24 February 2021 at 21:12
zetraesconor   Encodage - ASCII 24 February 2021 at 20:53
3lectro   Système - Android lock pattern 24 February 2021 at 20:36
Iron_Marshal   Substitution polyalphabétique - Vigenère 24 February 2021 at 20:07
bertrand81   Encodage - ASCII 24 February 2021 at 19:49
hippie   Fichier - PKZIP 24 February 2021 at 19:41
garnett   Encodage - ASCII 24 February 2021 at 19:40
Mini_Glome   AES128 - CTR 24 February 2021 at 19:32
Iron_Marshal   Substitution monoalphabétique - César 24 February 2021 at 19:32
CobblePot59   RSA - Oracle de déchiffrement 24 February 2021 at 19:17