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 27% 32530 5 Xartrick 10
pas_valide Encoding - UU 21% 25886 5 g0uZ 10
pas_valide Hash - Message Digest 5 22% 26578 5 g0uZ 6
pas_valide Hash - SHA-2 11% 13264 5 koma 3
pas_valide Shift cipher 7% 7877 10 m31z0nyx 5
pas_valide Pixel Madness 6% 6373 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 3736 15 Lu33Y 10
pas_valide File - PKZIP 4% 4703 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 5% 6201 15 Arod 4
pas_valide Known plaintext - XOR 4% 3884 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1467 20 Tosh 5
pas_valide File - Insecure storage 1 4% 4477 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4220 20 Arod 3
pas_valide System - Android lock pattern 3% 2675 20 Silentd 3
pas_valide Transposition - Rail Fence 3% 2512 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 165 25 Tie21 1
pas_valide AES - ECB 1% 1060 25 cez40 4
pas_valide LFSR - Known plaintext 1% 155 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1728 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 421 25 Zweisamkeit 3
pas_valide Service - Timing attack 2% 1310 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1465 25 koma 6
pas_valide Initialisation Vector 1% 765 25 manticore, notfound 3
pas_valide GEDEFU 1% 244 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 97 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 601 30 sambecks 1
pas_valide RSA - Common modulus 1% 517 30 franb 2
pas_valide Service - Hash length extension attack 1% 352 30 koma 1
pas_valide AES - 4 Rounds 1% 64 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 111 35 Tosh 0
pas_valide AES128 - CTR 1% 347 40 Tosh 1
pas_valide Discrete logarithm problem 1% 444 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key V2 1% 74 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 506 40 franb 3
pas_valide AES - Fault attack #1 1% 32 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 94 50 peyman 1
pas_valide ECDHE 1% 97 60 Tosh 2
pas_valide Service - CBC Padding 1% 551 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 241 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 55 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 25 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 53 75 Revenger 1
pas_valide AES - Fault attack #2 1% 23 80 Cryptanalyse 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
Mai Gulatin   Encoding - ASCII en 19 March 2019 at 06:03
m3duz4pwn   Shift cipher en 19 March 2019 at 03:15
m3duz4pwn   Known plaintext - XOR en 19 March 2019 at 02:55
m3duz4pwn   Polyalphabetic substitution - Vigenère en 19 March 2019 at 02:48
duwi   Encoding - ASCII en 19 March 2019 at 02:30
f0x-Tro0t   File - Insecure storage 1 fr 19 March 2019 at 02:25
thegoddesmaria   Hash - SHA-2 fr 19 March 2019 at 00:38
comAT0Zz   RSA - Decipher Oracle en 19 March 2019 at 00:03
Guizmo   AES - CBC - Bit-Flipping Attack fr 18 March 2019 at 23:31
Bharani Moorthy   Encodage - ASCII fr 18 March 2019 at 23:11