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 Encoding - ASCII 26% 53075 5 Xartrick 10
pas_valide Encoding - UU 21% 41635 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 41999 5 g0uZ 6
pas_valide Hash - SHA-2 11% 21563 5 koma 4
pas_valide Shift cipher 7% 13167 10 m31z0nyx 8
pas_valide Pixel Madness 6% 10357 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 5526 15 Lu33Y 10
pas_valide File - PKZIP 4% 7765 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 9824 15 Arod 4
pas_valide Known plaintext - XOR 3% 5888 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 2284 20 Tosh 5
pas_valide File - Insecure storage 1 4% 6154 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 6527 20 Arod 3
pas_valide System - Android lock pattern 3% 4289 20 Silentd 4
pas_valide Transposition - Rail Fence 2% 3967 20 YellowS4 3
pas_valide AES - CBC - Bit-Flipping Attack 1% 730 25 Tie21 2
pas_valide AES - ECB 1% 1656 25 cez40 4
pas_valide LFSR - Known plaintext 1% 496 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2783 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 937 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1837 25 g0uZ, koma 4
pas_valide Monoalphabetic substitution - Polybe 2% 2317 25 koma 6
pas_valide Twisted secret 1% 118 25 NonStandardModel 1
pas_valide Initialisation Vector 1% 1264 25 manticore, notfound404 5
pas_valide GEDEFU 1% 414 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 233 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 942 30 sambecks 1
pas_valide RSA - Common modulus 1% 1009 30 franb 2
pas_valide Service - Hash length extension attack 1% 627 30 koma 1
pas_valide AES - 4 Rounds 1% 167 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 138 35 Jrmbt 2
pas_valide RSA - Padding 1% 181 35 Tosh 0
pas_valide RSA - Signature 1% 71 35 s4r 1
pas_valide AES128 - CTR 1% 471 40 Tosh 1
pas_valide Discrete logarithm problem 1% 686 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 157 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 77 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 843 40 franb 3
pas_valide AES - Fault attack #1 1% 90 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 152 50 peyman 2
pas_valide ECDHE 1% 149 60 Tosh 2
pas_valide RSA - Lee cooper 1% 72 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 820 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 299 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 114 60 Cryptanalyse 3
pas_valide AES - Weaker variant 1% 58 70 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 82 75 Revenger 1
pas_valide AES - Fault attack #2 1% 66 80 Cryptanalyse 1
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 21 100 Tosh 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
Einstein   Encoding - ASCII 20 January 2021 at 23:46
juuj   Substitution monoalphabétique - César 20 January 2021 at 23:31
kekout   Clair connu - XOR 20 January 2021 at 23:30
SIPHO   Encodage - ASCII 20 January 2021 at 23:29
skyf0l   Twisted secret 20 January 2021 at 23:26
BaBinX   Encodage - ASCII 20 January 2021 at 23:13
shadoli   Encodage - UU 20 January 2021 at 23:04
shadoli   Encodage - ASCII 20 January 2021 at 23:03
10 EEEEEEEEEE   Encodage - ASCII 20 January 2021 at 22:40
Darmys   Chiffrement par décalage 20 January 2021 at 22:39