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 44 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 34437 5 Xartrick 10
pas_valide Encoding - UU 21% 27357 5 g0uZ 10
pas_valide Hash - Message Digest 5 22% 28111 5 g0uZ 6
pas_valide Hash - SHA-2 11% 13964 5 koma 3
pas_valide Shift cipher 7% 8285 10 m31z0nyx 5
pas_valide Pixel Madness 5% 6661 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 3885 15 Lu33Y 10
pas_valide File - PKZIP 4% 4933 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 5% 6478 15 Arod 4
pas_valide Known plaintext - XOR 4% 4083 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1532 20 Tosh 5
pas_valide File - Insecure storage 1 4% 4627 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4417 20 Arod 3
pas_valide System - Android lock pattern 3% 2815 20 Silentd 3
pas_valide Transposition - Rail Fence 2% 2644 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 218 25 Tie21 1
pas_valide AES - ECB 1% 1112 25 cez40 4
pas_valide LFSR - Known plaintext 1% 188 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1849 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 470 25 Zweisamkeit 3
pas_valide Service - Timing attack 2% 1367 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1542 25 koma 6
pas_valide Initialisation Vector 1% 817 25 manticore, notfound 3
pas_valide GEDEFU 1% 260 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 107 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 636 30 sambecks 1
pas_valide RSA - Common modulus 1% 567 30 franb 2
pas_valide Service - Hash length extension attack 1% 365 30 koma 1
pas_valide AES - 4 Rounds 1% 73 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 115 35 Tosh 0
pas_valide AES128 - CTR 1% 359 40 Tosh 1
pas_valide Discrete logarithm problem 1% 473 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key V2 1% 84 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 537 40 franb 3
pas_valide AES - Fault attack #1 1% 36 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 97 50 peyman 1
pas_valide ECDHE 1% 101 60 Tosh 2
pas_valide Service - CBC Padding 1% 568 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 246 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 60 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 26 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 55 75 Revenger 1
pas_valide AES - Fault attack #2 1% 24 80 Cryptanalyse 0
pas_valide AES-PMAC 0% 0 100 Cryptanalyse 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
UnknownScientist   Hash - Message Digest 5 fr 27 May 2019 at 09:45
Samsam   Encodage - ASCII fr 27 May 2019 at 09:42
UnknownScientist   Encodage - UU fr 27 May 2019 at 09:42
HieuNguyen   Hash - Message Digest 5 en 27 May 2019 at 09:35
HieuNguyen   Encoding - UU en 27 May 2019 at 09:33
drumthing   Encoding - ASCII de 27 May 2019 at 09:23
berdsa   Encoding - UU en 27 May 2019 at 08:34
berdsa   Encoding - ASCII en 27 May 2019 at 08:24
mike47   Hash - Message Digest 5 fr 27 May 2019 at 01:04
mike47   Encodage - UU fr 27 May 2019 at 01:03