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% 12976 5 Xartrick 10
pas_valide Encoding - UU 23% 10581 5 g0uZ 4
pas_valide Hash - Message Digest 5 25% 11211 5 g0uZ 2
pas_valide Hash - SHA-2 11% 4982 5 koma 2
pas_valide Shift cipher 8% 3263 10 m31z0nyx 3
pas_valide Pixel Madness 6% 2380 15 Ryscrow 7
pas_valide ELF32 - PID encryption 6% 2372 15 Lu33Y 9
pas_valide File - PKZIP 5% 2116 15 g0uZ 2
pas_valide Monoalphabetic substitution - Caesar 8% 3272 15 Arod 3
pas_valide Known plaintext - XOR 4% 1829 20 Ryscrow 3
pas_valide Code - Pseudo Random Number Generator 2% 752 20 Tosh 2
pas_valide File - Insecure storage 1 7% 2863 20 g0uZ 3
pas_valide Polyalphabetic substitution - Vigenère 5% 2242 20 Arod 1
pas_valide System - Android lock pattern 3% 1341 20 Silentd 1
pas_valide Transposition - Rail Fence 3% 1244 20 YellowS4 1
pas_valide AES - ECB 2% 486 25 cez40 1
pas_valide RSA - Factorisation 2% 880 25 HacKSpider 2
pas_valide Service - Timing attack 2% 786 25 g0uZ, koma 2
pas_valide Monoalphabetic substitution - Polybe 2% 891 25 Armel, koma 1
pas_valide Initialisation Vector 1% 423 25 notfound, manticore 3
pas_valide GEDEFU 1% 118 30 makhno 1
pas_valide RSA - Continued fractions 1% 290 30 sambecks 1
pas_valide RSA - Common modulus 1% 111 30 franb 0
pas_valide Service - Hash length extension attack 1% 189 30 koma 0
pas_valide RSA - Padding 1% 31 35 Tosh 0
pas_valide AES128 - CTR 1% 190 40 Tosh 0
pas_valide Discrete logarithm problem 1% 289 40 Thanat0s, RFC4949 1
pas_valide RSA - Multiple recipients 1% 209 40 franb 0
pas_valide Enigma Machine 1% 29 50 peyman 0
pas_valide ECDHE 1% 25 60 Tosh 1
pas_valide Service - CBC Padding 1% 338 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 166 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 16 75 Revenger 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
t4rsky   Hash - SHA-2 en 23 February 2017 at 01:10
t4rsky   Hash - Message Digest 5 en 23 February 2017 at 00:54
t4rsky   Encoding - UU en 23 February 2017 at 00:53
t4rsky   Encoding - ASCII en 23 February 2017 at 00:50
alariot   Hash - Message Digest 5 en 23 February 2017 at 00:46
alariot   Encoding - UU en 23 February 2017 at 00:45
alariot   Encoding - ASCII en 23 February 2017 at 00:43
JACK_LAPIQUETE   Fichier - PKZIP fr 23 February 2017 at 00:35
Orion   Fichier - PKZIP fr 22 February 2017 at 23:42
JACK_LAPIQUETE   Substitution polyalphabétique - Vigenère fr 22 February 2017 at 23:38