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 43 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 27910 5 Xartrick 10
pas_valide Encoding - UU 22% 22364 5 g0uZ 10
pas_valide Hash - Message Digest 5 23% 23118 5 g0uZ 6
pas_valide Hash - SHA-2 12% 11770 5 koma 3
pas_valide Shift cipher 7% 6914 10 m31z0nyx 5
pas_valide Pixel Madness 6% 5651 15 Ryscrow 10
pas_valide ELF64 - PID encryption 4% 3470 15 Lu33Y 10
pas_valide File - PKZIP 5% 4179 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 5549 15 Arod 4
pas_valide Known plaintext - XOR 4% 3516 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1325 20 Tosh 4
pas_valide File - Insecure storage 1 5% 4202 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 3812 20 Arod 3
pas_valide System - Android lock pattern 3% 2409 20 Silentd 3
pas_valide Transposition - Rail Fence 3% 2262 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 114 25 Tie21 1
pas_valide AES - ECB 1% 980 25 cez40 4
pas_valide LFSR - Known plaintext 1% 132 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1552 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 350 25 Zweisamkeit 2
pas_valide Service - Timing attack 2% 1212 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1347 25 koma 6
pas_valide Initialisation Vector 1% 691 25 notfound, manticore 3
pas_valide GEDEFU 1% 220 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 78 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 547 30 sambecks 1
pas_valide RSA - Common modulus 1% 442 30 franb 2
pas_valide Service - Hash length extension attack 1% 328 30 koma 1
pas_valide AES - 4 Rounds 1% 42 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 100 35 Tosh 0
pas_valide AES128 - CTR 1% 314 40 Tosh 1
pas_valide Discrete logarithm problem 1% 416 40 Thanat0s, RFC4949 2
pas_valide RSA - Corrupted key V2 1% 56 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 450 40 franb 3
pas_valide AES - Fault attack #1 1% 18 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 76 50 peyman 0
pas_valide ECDHE 1% 81 60 Tosh 2
pas_valide Service - CBC Padding 1% 505 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 223 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 32 60 Cryptanalyse 1
pas_valide AES - Weaker variant 1% 15 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 40 75 Revenger 1
pas_valide AES - Fault attack #2 1% 12 80 Cryptanalyse 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
Ghost1050   Système - Android lock pattern fr 14 November 2018 at 17:30
sr_v1n   Hash - SHA-2 fr 14 November 2018 at 17:29
TPUHA   Hash - SHA-2 fr 14 November 2018 at 17:25
oleg99   Système - Android lock pattern fr 14 November 2018 at 17:17
Rabougris   Encodage - UU fr 14 November 2018 at 17:16
Oxmoo   Hash - Message Digest 5 en 14 November 2018 at 17:15
sr_v1n   Hash - Message Digest 5 fr 14 November 2018 at 17:14
sr_v1n   Encodage - UU fr 14 November 2018 at 17:14
Oxmoo   Encoding - UU en 14 November 2018 at 17:14
Rabougris   Encodage - ASCII fr 14 November 2018 at 17:14