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 33 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 29% 12146 5 Xartrick 10
pas_valide Encoding - UU 24% 9951 5 g0uZ 4
pas_valide Hash - Message Digest 5 25% 10561 5 g0uZ 2
pas_valide Hash - SHA-2 11% 4669 5 koma 2
pas_valide Shift cipher 8% 3094 10 m31z0nyx 3
pas_valide Pixel Madness 6% 2245 15 Ryscrow 7
pas_valide ELF32 - PID encryption 6% 2304 15 Lu33Y 9
pas_valide File - PKZIP 5% 2022 15 g0uZ 2
pas_valide Monoalphabetic substitution - Caesar 8% 3151 15 Arod 3
pas_valide Known plaintext - XOR 5% 1739 20 Ryscrow 3
pas_valide Code - Pseudo Random Number Generator 2% 715 20 Tosh 2
pas_valide File - Insecure storage 1 7% 2789 20 g0uZ 3
pas_valide Polyalphabetic substitution - Vigenère 6% 2152 20 Arod 1
pas_valide System - Android lock pattern 3% 1272 20 Silentd 1
pas_valide Transposition - Rail Fence 3% 1175 20 YellowS4 1
pas_valide AES - ECB 2% 455 25 cez40 1
pas_valide RSA - Factorisation 2% 827 25 HacKSpider 2
pas_valide Service - Timing attack 2% 752 25 g0uZ, koma 2
pas_valide Monoalphabetic substitution - Polybe 3% 857 25 Armel, koma 1
pas_valide Initialisation Vector 1% 397 25 notfound, manticore 3
pas_valide GEDEFU 1% 99 30 makhno 1
pas_valide RSA - Continued fractions 1% 272 30 sambecks 1
pas_valide RSA - Common modulus 1% 61 30 franb 0
pas_valide Service - Hash length extension attack 1% 188 30 koma 0
pas_valide RSA - Padding 1% 27 35 Tosh 0
pas_valide AES128 - CTR 1% 178 40 Tosh 0
pas_valide Discrete logarithm problem 1% 277 40 Thanat0s, RFC4949 1
pas_valide RSA - Multiple recipients 1% 193 40 franb 0
pas_valide Enigma Machine 1% 21 50 peyman 0
pas_valide ECDHE 1% 20 60 Tosh 1
pas_valide Service - CBC Padding 1% 327 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 162 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 9 75 Revenger 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
Julien   Monoalphabetic substitution - Caesar en 16 January 2017 at 13:38
dbourdon42   Chiffrement par décalage fr 16 January 2017 at 13:00
Yaxh   Hash - SHA-2 fr 16 January 2017 at 12:48
FNFDNDFJ   Chiffrement par décalage fr 16 January 2017 at 12:44
Yobaieu   Hash - Message Digest 5 fr 16 January 2017 at 12:42
Yobaieu   Encodage - UU fr 16 January 2017 at 12:40
Yobaieu   Encodage - ASCII fr 16 January 2017 at 12:37
dbourdon42   Hash - SHA-2 fr 16 January 2017 at 12:32
Rlyeh   Substitution monoalphabétique - César fr 16 January 2017 at 11:49
Damien   File - Insecure storage 1 fr 16 January 2017 at 11:27