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 40 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 25938 5 Xartrick 10
pas_valide Encoding - UU 22% 20797 5 g0uZ 10
pas_valide Hash - Message Digest 5 23% 21522 5 g0uZ 4
pas_valide Hash - SHA-2 12% 10919 5 koma 3
pas_valide Shift cipher 7% 6434 10 m31z0nyx 5
pas_valide Pixel Madness 6% 5194 15 Ryscrow 10
pas_valide ELF32 - PID encryption 4% 3328 15 Lu33Y 10
pas_valide File - PKZIP 5% 3872 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 5203 15 Arod 4
pas_valide Known plaintext - XOR 4% 3305 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1256 20 Tosh 4
pas_valide File - Insecure storage 1 5% 4062 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 3576 20 Arod 3
pas_valide System - Android lock pattern 3% 2288 20 Silentd 3
pas_valide Transposition - Rail Fence 3% 2120 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 84 25 Tie21 1
pas_valide AES - ECB 1% 945 25 cez40 4
pas_valide LFSR - Known plaintext 1% 117 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1469 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 317 25 Zweisamkeit 2
pas_valide Service - Timing attack 2% 1163 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1293 25 koma 6
pas_valide Initialisation Vector 1% 663 25 notfound, manticore 3
pas_valide GEDEFU 1% 207 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 68 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 524 30 sambecks 1
pas_valide RSA - Common modulus 1% 411 30 franb 2
pas_valide Service - Hash length extension attack 1% 317 30 koma 1
pas_valide AES - 4 Rounds 1% 24 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 95 35 Tosh 0
pas_valide AES128 - CTR 1% 299 40 Tosh 1
pas_valide Discrete logarithm problem 1% 405 40 Thanat0s, RFC4949 2
pas_valide RSA - Corrupted key V2 1% 51 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 428 40 franb 3
pas_valide Enigma Machine 1% 73 50 peyman 0
pas_valide ECDHE 1% 80 60 Tosh 2
pas_valide Service - CBC Padding 1% 496 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 220 60 Thanat0s 0
pas_valide AES - Weaker variant 1% 6 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 38 75 Revenger 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
rastapower05   Hash - SHA-2 fr 19 September 2018 at 15:44
guilhem   Hash - Message Digest 5 fr 19 September 2018 at 15:35
hutchR   Hash - SHA-2 fr 19 September 2018 at 15:34
rastapower05   Hash - Message Digest 5 fr 19 September 2018 at 15:32
rastapower05   Encodage - UU fr 19 September 2018 at 15:31
rastapower05   Encodage - ASCII fr 19 September 2018 at 15:29
piary22   Pixel Madness en 19 September 2018 at 15:27
AreopEnap   AES - 4 tours fr 19 September 2018 at 15:00
Overdrive   Substitution monoalphabétique - César fr 19 September 2018 at 14:59
piary22   Shift cipher en 19 September 2018 at 14:52