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% 49443 5 Xartrick 10
pas_valide Encoding - UU 21% 38783 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 39227 5 g0uZ 6
pas_valide Hash - SHA-2 11% 20032 5 koma 4
pas_valide Shift cipher 7% 12222 10 m31z0nyx 8
pas_valide Pixel Madness 5% 9626 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 5242 15 Lu33Y 10
pas_valide File - PKZIP 4% 7227 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 9190 15 Arod 4
pas_valide Known plaintext - XOR 3% 5548 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 2125 20 Tosh 5
pas_valide File - Insecure storage 1 4% 5835 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 6153 20 Arod 3
pas_valide System - Android lock pattern 3% 4007 20 Silentd 4
pas_valide Transposition - Rail Fence 2% 3745 20 YellowS4 3
pas_valide AES - CBC - Bit-Flipping Attack 1% 639 25 Tie21 1
pas_valide AES - ECB 1% 1579 25 cez40 4
pas_valide LFSR - Known plaintext 1% 450 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2600 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 847 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1762 25 g0uZ, koma 4
pas_valide Monoalphabetic substitution - Polybe 2% 2178 25 koma 6
pas_valide Twisted secret 1% 53 25 nonstandardmodel 1
pas_valide Initialisation Vector 1% 1190 25 manticore, notfound404 5
pas_valide GEDEFU 1% 394 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 211 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 880 30 sambecks 1
pas_valide RSA - Common modulus 1% 923 30 franb 2
pas_valide Service - Hash length extension attack 1% 578 30 koma 1
pas_valide AES - 4 Rounds 1% 153 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 121 35 Jrmbt 1
pas_valide RSA - Padding 1% 169 35 Tosh 0
pas_valide RSA - Signature 1% 60 35 s4r 1
pas_valide AES128 - CTR 1% 458 40 Tosh 1
pas_valide Discrete logarithm problem 1% 620 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 141 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 69 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 789 40 franb 3
pas_valide AES - Fault attack #1 1% 80 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 143 50 peyman 2
pas_valide ECDHE 1% 143 60 Tosh 2
pas_valide RSA - Lee cooper 1% 61 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 784 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 287 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 104 60 Cryptanalyse 3
pas_valide AES - Weaker variant 1% 49 70 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 79 75 Revenger 1
pas_valide AES - Fault attack #2 1% 57 80 Cryptanalyse 1
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 19 100 Tosh 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
Valentin   Décomposition pixelisée 29 September 2020 at 12:40
Salmon   Encoding - ASCII 29 September 2020 at 12:39
scort   ELF64 - Chiffrement avec le PID 29 September 2020 at 12:39
Valentin   Encodage - UU 29 September 2020 at 12:38
Valentin   Encodage - ASCII 29 September 2020 at 12:37
Darcheville   Hash - Message Digest 5 29 September 2020 at 12:16
hxtninfosec   Hash - Message Digest 5 29 September 2020 at 12:09
hxtninfosec   Encodage - UU 29 September 2020 at 12:09
hxtninfosec   Encodage - ASCII 29 September 2020 at 12:08
Darcheville   Encodage - UU 29 September 2020 at 12:06