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 34 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 17869 5 Xartrick 10
pas_valide Encoding - UU 23% 14339 5 g0uZ 5
pas_valide Hash - Message Digest 5 24% 15018 5 g0uZ 3
pas_valide Hash - SHA-2 12% 7153 5 koma 2
pas_valide Shift cipher 7% 4322 10 m31z0nyx 4
pas_valide Pixel Madness 6% 3317 15 Ryscrow 8
pas_valide ELF32 - PID encryption 5% 2756 15 Lu33Y 9
pas_valide File - PKZIP 5% 2663 15 g0uZ 4
pas_valide Monoalphabetic substitution - Caesar 7% 3919 15 Arod 4
pas_valide Known plaintext - XOR 4% 2360 20 Ryscrow 3
pas_valide Code - Pseudo Random Number Generator 2% 934 20 Tosh 3
pas_valide File - Insecure storage 1 5% 3228 20 g0uZ 3
pas_valide Polyalphabetic substitution - Vigenère 5% 2749 20 Arod 2
pas_valide System - Android lock pattern 3% 1676 20 Silentd 2
pas_valide Transposition - Rail Fence 3% 1581 20 YellowS4 2
pas_valide AES - ECB 2% 674 25 cez40 2
pas_valide RSA - Decipher Oracle 1% 164 25 Zweisamkeit 2
pas_valide RSA - Factorisation 2% 1085 25 HacKSpider 2
pas_valide Service - Timing attack 2% 925 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1046 25 Armel, koma 4
pas_valide Initialisation Vector 1% 510 25 notfound, manticore 3
pas_valide GEDEFU 1% 159 30 makhno 1
pas_valide RSA - Continued fractions 1% 394 30 sambecks 1
pas_valide RSA - Common modulus 1% 238 30 franb 2
pas_valide Service - Hash length extension attack 1% 237 30 koma 1
pas_valide RSA - Padding 1% 69 35 Tosh 0
pas_valide AES128 - CTR 1% 236 40 Tosh 1
pas_valide Discrete logarithm problem 1% 332 40 Thanat0s, RFC4949 2
pas_valide RSA - Multiple recipients 1% 302 40 franb 1
pas_valide Enigma Machine 1% 54 50 peyman 0
pas_valide ECDHE 1% 52 60 Tosh 1
pas_valide Service - CBC Padding 1% 415 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 187 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 22 75 Revenger 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
tbenetre   Encodage - ASCII fr 18 October 2017 at 03:08
yusf   Fichier - PKZIP fr 18 October 2017 at 02:09
SIben   RSA - Fractions continues fr 18 October 2017 at 01:53
WhiteHat_CSI   Clair connu - XOR fr 18 October 2017 at 01:45
bapt51101   Hash - SHA-2 en 18 October 2017 at 01:41
bapt51101   Hash - Message Digest 5 en 18 October 2017 at 01:22
bapt51101   Encoding - UU en 18 October 2017 at 01:21
bapt51101   Encoding - ASCII en 18 October 2017 at 01:16
ghost404   Hash - SHA-2 en 18 October 2017 at 01:14
ghost404   Hash - Message Digest 5 en 18 October 2017 at 00:51