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 28% 14435 5 Xartrick 14
pas_valide Encoding - UU 23% 11674 5 g0uZ 5
pas_valide Hash - Message Digest 5 24% 12342 5 g0uZ 3
pas_valide Hash - SHA-2 11% 5591 5 koma 3
pas_valide Shift cipher 7% 3600 10 m31z0nyx 11
pas_valide Pixel Madness 6% 2661 15 Ryscrow 12
pas_valide ELF32 - PID encryption 5% 2486 15 Lu33Y 14
pas_valide File - PKZIP 5% 2282 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 7% 3461 15 Arod 5
pas_valide Known plaintext - XOR 4% 2006 20 Ryscrow 11
pas_valide Code - Pseudo Random Number Generator 2% 790 20 Tosh 7
pas_valide File - Insecure storage 1 6% 2970 20 g0uZ 7
pas_valide Polyalphabetic substitution - Vigenère 5% 2406 20 Arod 5
pas_valide System - Android lock pattern 3% 1443 20 Silentd 4
pas_valide Transposition - Rail Fence 3% 1331 20 YellowS4 5
pas_valide AES - ECB 2% 525 25 cez40 3
pas_valide RSA - Factorisation 2% 932 25 HacKSpider 2
pas_valide Service - Timing attack 2% 817 25 g0uZ, koma 8
pas_valide Monoalphabetic substitution - Polybe 2% 932 25 Armel, koma 4
pas_valide Initialisation Vector 1% 440 25 notfound, manticore 3
pas_valide GEDEFU 1% 135 30 makhno 3
pas_valide RSA - Continued fractions 1% 320 30 sambecks 3
pas_valide RSA - Common modulus 1% 144 30 franb 3
pas_valide Service - Hash length extension attack 1% 202 30 koma 3
pas_valide RSA - Padding 1% 41 35 Tosh 1
pas_valide AES128 - CTR 1% 199 40 Tosh 3
pas_valide Discrete logarithm problem 1% 302 40 Thanat0s, RFC4949 7
pas_valide RSA - Multiple recipients 1% 237 40 franb 6
pas_valide Enigma Machine 1% 33 50 peyman 2
pas_valide ECDHE 1% 29 60 Tosh 1
pas_valide Service - CBC Padding 1% 351 60 koma 7
pas_valide Polyalphabetic substitution - One Time Pad 1% 172 60 Thanat0s 2
pas_valide Hash - SHA-3 1% 18 75 Revenger 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
buiviethoan   Encoding - ASCII en 30 April 2017 at 06:22
Yolan   Encodage - ASCII fr 30 April 2017 at 02:24
x00x101101   Hash - SHA-2 en 30 April 2017 at 02:10
x00x101101   Hash - Message Digest 5 en 30 April 2017 at 01:44
x00x101101   Encoding - UU en 30 April 2017 at 01:42
Melkor   Encoding - ASCII es 30 April 2017 at 01:32
x00x101101   Encoding - ASCII en 30 April 2017 at 01:32
hliana   Encoding - UU en 29 April 2017 at 23:36
hliana   Encoding - ASCII en 29 April 2017 at 23:34
nbsp   Décomposition pixelisée fr 29 April 2017 at 23:22