Cryptanalysis

You can test your cryptanalysis skills here.

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 associated with this section 36 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 19730 5 Xartrick 10
pas_valide Encoding - UU 23% 15834 5 g0uZ 6
pas_valide Hash - Message Digest 5 24% 16484 5 g0uZ 3
pas_valide Hash - SHA-2 12% 8018 5 koma 2
pas_valide Shift cipher 7% 4709 10 m31z0nyx 5
pas_valide Pixel Madness 6% 3634 15 Ryscrow 8
pas_valide ELF32 - PID encryption 5% 2891 15 Lu33Y 9
pas_valide File - PKZIP 5% 2885 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 4189 15 Arod 4
pas_valide Known plaintext - XOR 4% 2548 20 Ryscrow 3
pas_valide Code - Pseudo Random Number Generator 2% 1012 20 Tosh 3
pas_valide File - Insecure storage 1 5% 3358 20 g0uZ 4
pas_valide Polyalphabetic substitution - Vigenรจre 5% 2921 20 Arod 3
pas_valide System - Android lock pattern 3% 1771 20 Silentd 2
pas_valide Transposition - Rail Fence 3% 1682 20 YellowS4 2
pas_valide AES - ECB 2% 740 25 cez40 2
pas_valide LFSR - Known plaintext 1% 34 25 Brissouille 0
pas_valide RSA - Factorisation 2% 1174 25 HacKSpider 2
pas_valide RSA - Decipher Oracle 1% 193 25 Zweisamkeit 2
pas_valide Service - Timing attack 2% 972 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1090 25 Armel, koma 5
pas_valide Initialisation Vector 1% 544 25 notfound, manticore 3
pas_valide GEDEFU 1% 168 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 15 30 blackndoor 0
pas_valide RSA - Continued fractions 1% 428 30 sambecks 1
pas_valide RSA - Common modulus 1% 279 30 franb 2
pas_valide Service - Hash length extension attack 1% 247 30 koma 1
pas_valide RSA - Padding 1% 70 35 Tosh 0
pas_valide AES128 - CTR 1% 247 40 Tosh 1
pas_valide Discrete logarithm problem 1% 345 40 Thanat0s, RFC4949 2
pas_valide RSA - Multiple recipients 1% 332 40 franb 1
pas_valide Enigma Machine 1% 55 50 peyman 0
pas_valide ECDHE 1% 54 60 Tosh 1
pas_valide Service - CBC Padding 1% 436 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 191 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 22 75 Revenger 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
AAA   Encodage - ASCII fr 15 December 2017 at 23:24
AAA   Hash - Message Digest 5 fr 15 December 2017 at 23:18
dinomerci   Hash - SHA-2 fr 15 December 2017 at 22:52
Fedestark2   Encoding - UU en 15 December 2017 at 22:37
dinomerci   Hash - Message Digest 5 fr 15 December 2017 at 22:31
dinomerci   Encodage - UU fr 15 December 2017 at 22:26
ratnik   Encoding - UU es 15 December 2017 at 22:20
homard11   Hash - SHA-2 fr 15 December 2017 at 22:20
ratnik   Encoding - ASCII es 15 December 2017 at 22:10
flosers   Chiffrement par dรฉcalage fr 15 December 2017 at 21:57