Cryptanalysis

Break encryption algorithms

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.

 50 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty   Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 51860 5 Xartrick 10
pas_valide Hash - Message Digest 5 21% 41112 5 g0uZ 6
pas_valide Hash - SHA-2 11% 21112 5 koma 4
pas_valide Encoding - UU 21% 40740 5 g0uZ 10
pas_valide Shift cipher 7% 12889 10 m31z0nyx 8
pas_valide File - PKZIP 4% 7588 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 9655 15 Arod 4
pas_valide ECDSA - Introduction 1% 133 35 Jrmbt 2
pas_valide RSA - Continued fractions 1% 922 30 sambecks 1
pas_valide RSA - Common modulus 1% 974 30 franb 2
pas_valide Service - Hash length extension attack 1% 608 30 koma 1
pas_valide AES - 4 Rounds 1% 161 35 Cryptanalyse 0
pas_valide Discrete logarithm problem 1% 670 40 Thanat0s, RFC4949 3
pas_valide RSA - Padding 1% 177 35 Tosh 0
pas_valide RSA - Signature 1% 68 35 s4r 1
pas_valide AES128 - CTR 1% 466 40 Tosh 1
pas_valide Initialisation Vector 1% 1233 25 manticore, notfound404 5
pas_valide RSA - Corrupted key 2 1% 147 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 75 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 825 40 franb 3
pas_valide GEDEFU 1% 404 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 223 30 blackndoor 2
pas_valide Twisted secret 1% 103 25 NonStandardModel 1
pas_valide System - Android lock pattern 3% 4195 20 Silentd 4
pas_valide Pixel Madness 6% 10122 15 Ryscrow 10
pas_valide Monoalphabetic substitution - Polybe 2% 2276 25 koma 6
pas_valide Known plaintext - XOR 3% 5798 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 2225 20 Tosh 5
pas_valide File - Insecure storage 1 4% 6036 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 6422 20 Arod 3
pas_valide ELF64 - PID encryption 3% 5453 15 Lu33Y 10
pas_valide Transposition - Rail Fence 2% 3876 20 YellowS4 3
pas_valide AES - ECB 1% 1624 25 cez40 4
pas_valide LFSR - Known plaintext 1% 476 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2724 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 907 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1808 25 g0uZ, koma 4
pas_valide AES - CBC - Bit-Flipping Attack 1% 694 25 Tie21 2
pas_valide White-Box Cryptography 1% 112 60 Cryptanalyse 3
pas_valide AES - Fault attack #2 1% 64 80 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 81 75 Revenger 1
pas_valide AES - Weaker variant 1% 57 70 Cryptanalyse 1
pas_valide ECDHE 1% 147 60 Tosh 2
pas_valide Polyalphabetic substitution - One Time Pad 1% 295 60 Thanat0s 0
pas_valide Service - CBC Padding 1% 808 60 koma 1
pas_valide RSA - Lee cooper 1% 66 60 blackndoor, Synacktiv 0
pas_valide Enigma Machine 1% 149 50 peyman 2
pas_valide AES - Fault attack #1 1% 86 50 Cryptanalyse 1
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 20 100 Tosh 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
Harment   Hash - Message Digest 5 3 December 2020 at 08:53
NaN   Encoding - ASCII 3 December 2020 at 08:44
Skynet   Monoalphabetic substitution - Polybe 3 December 2020 at 08:37
dracula012   Hash - SHA-2 3 December 2020 at 08:30
d35ync_   Polyalphabetic substitution - Vigenère 3 December 2020 at 08:05
Skynet   Known plaintext - XOR 3 December 2020 at 07:53
d35ync_   Transposition - Rail Fence 3 December 2020 at 07:48
Assem Nurzhankyzy   Encoding - UU 3 December 2020 at 07:41
dracula012   Hash - Message Digest 5 3 December 2020 at 07:35
Skynet   Pixel Madness 3 December 2020 at 07:30