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% 16590 5 Xartrick 10
pas_valide Encoding - UU 23% 13328 5 g0uZ 5
pas_valide Hash - Message Digest 5 24% 14031 5 g0uZ 3
pas_valide Hash - SHA-2 11% 6585 5 koma 2
pas_valide Shift cipher 7% 4043 10 m31z0nyx 4
pas_valide Pixel Madness 6% 3064 15 Ryscrow 8
pas_valide ELF32 - PID encryption 5% 2683 15 Lu33Y 9
pas_valide File - PKZIP 5% 2557 15 g0uZ 4
pas_valide Monoalphabetic substitution - Caesar 7% 3734 15 Arod 3
pas_valide Known plaintext - XOR 4% 2246 20 Ryscrow 3
pas_valide Code - Pseudo Random Number Generator 2% 896 20 Tosh 3
pas_valide File - Insecure storage 1 6% 3153 20 g0uZ 3
pas_valide Polyalphabetic substitution - Vigenère 5% 2625 20 Arod 2
pas_valide System - Android lock pattern 3% 1603 20 Silentd 2
pas_valide Transposition - Rail Fence 3% 1485 20 YellowS4 2
pas_valide AES - ECB 2% 621 25 cez40 1
pas_valide RSA - Decipher Oracle 1% 134 25 Zweisamkeit 2
pas_valide RSA - Factorisation 2% 1029 25 HacKSpider 2
pas_valide Service - Timing attack 2% 887 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1001 25 Armel, koma 3
pas_valide Initialisation Vector 1% 485 25 notfound, manticore 3
pas_valide GEDEFU 1% 154 30 makhno 1
pas_valide RSA - Continued fractions 1% 362 30 sambecks 1
pas_valide RSA - Common modulus 1% 205 30 franb 1
pas_valide Service - Hash length extension attack 1% 224 30 koma 1
pas_valide RSA - Padding 1% 60 35 Tosh 0
pas_valide AES128 - CTR 1% 221 40 Tosh 0
pas_valide Discrete logarithm problem 1% 313 40 Thanat0s, RFC4949 2
pas_valide RSA - Multiple recipients 1% 272 40 franb 0
pas_valide Enigma Machine 1% 49 50 peyman 0
pas_valide ECDHE 1% 42 60 Tosh 1
pas_valide Service - CBC Padding 1% 383 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 181 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 22 75 Revenger 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
Tony Bray   Chiffrement par décalage fr 18 August 2017 at 13:41
artdan   File - Insecure storage 1 en 18 August 2017 at 13:28
b0rneira   RSA - Decipher Oracle es 18 August 2017 at 13:10
AbueloCORP   Monoalphabetic substitution - Polybe en 18 August 2017 at 06:56
AutoCrot   Shift cipher en 18 August 2017 at 06:38
AutoCrot   Hash - SHA-2 en 18 August 2017 at 05:57
Pharisaeus   RSA - Continued fractions en 18 August 2017 at 02:34
Xploadway   Hash - SHA-2 fr 18 August 2017 at 01:41
Xploadway   Hash - Message Digest 5 fr 18 August 2017 at 01:34
Xploadway   Encodage - UU fr 18 August 2017 at 01:32