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 Polyalphabetic substitution - One Time Pad 1% 295 60 Thanat0s 0
pas_valide AES - ECB 1% 1623 25 cez40 4
pas_valide RSA - Corrupted key 2 1% 147 40 blackndoor 0
pas_valide GEDEFU 1% 404 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 223 30 blackndoor 2
pas_valide File - PKZIP 4% 7585 15 g0uZ 6
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 20 100 Tosh 0
pas_valide AES - Fault attack #2 1% 64 80 Cryptanalyse 1
pas_valide Monoalphabetic substitution - Caesar 5% 9648 15 Arod 4
pas_valide RSA - Factorisation 2% 2723 25 HacKSpider 5
pas_valide Shift cipher 7% 12878 10 m31z0nyx 8
pas_valide Hash - SHA-2 11% 21081 5 koma 4
pas_valide Discrete logarithm problem 1% 667 40 Thanat0s, RFC4949 3
pas_valide Transposition - Rail Fence 2% 3873 20 YellowS4 3
pas_valide LFSR - Known plaintext 1% 474 25 Brissouille 1
pas_valide Enigma Machine 1% 149 50 peyman 2
pas_valide Pixel Madness 6% 10114 15 Ryscrow 10
pas_valide AES - Weaker variant 1% 57 70 Cryptanalyse 1
pas_valide Polyalphabetic substitution - Vigenère 4% 6417 20 Arod 3
pas_valide File - Insecure storage 1 4% 6030 20 g0uZ 5
pas_valide Hash - SHA-3 1% 81 75 Revenger 1
pas_valide Monoalphabetic substitution - Polybe 2% 2275 25 koma 6
pas_valide AES - CBC - Bit-Flipping Attack 1% 691 25 Tie21 2
pas_valide Initialisation Vector 1% 1233 25 manticore, notfound404 5
pas_valide AES128 - CTR 1% 466 40 Tosh 1
pas_valide Service - Timing attack 1% 1808 25 g0uZ, koma 4
pas_valide RSA - Multiple recipients 1% 825 40 franb 3
pas_valide AES - 4 Rounds 1% 161 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 133 35 Jrmbt 2
pas_valide ELF64 - PID encryption 3% 5450 15 Lu33Y 10
pas_valide System - Android lock pattern 3% 4193 20 Silentd 4
pas_valide RSA - Decipher Oracle 1% 907 25 Zweisamkeit 3
pas_valide RSA - Signature 1% 68 35 s4r 1
pas_valide Known plaintext - XOR 3% 5793 20 Ryscrow 5
pas_valide Service - CBC Padding 1% 808 60 koma 1
pas_valide Code - Pseudo Random Number Generator 2% 2223 20 Tosh 5
pas_valide AES - Fault attack #1 1% 86 50 Cryptanalyse 1
pas_valide RSA - Lee cooper 1% 66 60 blackndoor, Synacktiv 0
pas_valide Hash - Message Digest 5 21% 41069 5 g0uZ 6
pas_valide RSA - Continued fractions 1% 922 30 sambecks 1
pas_valide Service - Hash length extension attack 1% 608 30 koma 1
pas_valide RSA - Padding 1% 177 35 Tosh 0
pas_valide Encoding - UU 21% 40698 5 g0uZ 10
pas_valide White-Box Cryptography 1% 112 60 Cryptanalyse 3
pas_valide Twisted secret 1% 103 25 NonStandardModel 1
pas_valide ECDHE 1% 147 60 Tosh 2
pas_valide Encoding - ASCII 26% 51818 5 Xartrick 10
pas_valide RSA - Common modulus 1% 974 30 franb 2
pas_valide RSA - Corrupted key 3 1% 75 40 blackndoor 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
drake   ELF64 - PID encryption 2 December 2020 at 07:25
raffy514   Substitution monoalphabétique - César 2 December 2020 at 04:24
Sam0x90   Substitution monoalphabétique - Polybe 2 December 2020 at 02:45
SlimJimGrim   Hash - SHA-2 2 December 2020 at 02:34
HelloWorld   Hash - SHA-2 2 December 2020 at 02:24
VanNam212   Hash - SHA-2 2 December 2020 at 02:22
nguyenbang   Hash - SHA-2 2 December 2020 at 02:10
VanNam212   Hash - Message Digest 5 2 December 2020 at 02:04
nghiemduong1809   Encoding - ASCII 2 December 2020 at 01:56
VanNam212   Encoding - UU 2 December 2020 at 01:55