Polyalphabetic substitution - One Time Pad

60 Points  

A Perfect cipher only if…

Author

Thanat0s,  

Level  Difficulty

Validations

223 Challengers 1%

Note  Notation

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55 Votes
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Solution  Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
cladff10   Polyalphabetic substitution - One Time Pad en 1 October 2018 at 13:47
f286c42f3d9b0b1bb0ce736333a46030   Substitution polyalphabétique - Masque jetable fr 28 September 2018 at 09:14
das   Polyalphabetic substitution - One Time Pad en 24 September 2018 at 17:31
Zeecka   Substitution polyalphabétique - Masque jetable fr 10 September 2018 at 12:13
Baptiste M. (Creased)   Substitution polyalphabétique - Masque jetable fr 28 August 2018 at 15:46
dalifit   Substitution polyalphabétique - Masque jetable fr 26 August 2018 at 23:42
Areizen   Substitution polyalphabétique - Masque jetable fr 24 August 2018 at 11:19
corpsfini   Substitution polyalphabétique - Masque jetable fr 15 August 2018 at 19:54
dali1999   Polyalphabetic substitution - One Time Pad en 2 August 2018 at 18:38
Iptior   Substitution polyalphabétique - Masque jetable fr 6 July 2018 at 10:58

Challenges associated with this section 42 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 26945 5 Xartrick 10
pas_valide Encoding - UU 22% 21573 5 g0uZ 10
pas_valide Hash - Message Digest 5 23% 22293 5 g0uZ 5
pas_valide Hash - SHA-2 12% 11339 5 koma 3
pas_valide Shift cipher 7% 6672 10 m31z0nyx 5
pas_valide Pixel Madness 6% 5428 15 Ryscrow 10
pas_valide ELF32 - PID encryption 4% 3394 15 Lu33Y 10
pas_valide File - PKZIP 5% 4025 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 5373 15 Arod 4
pas_valide Known plaintext - XOR 4% 3397 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1292 20 Tosh 4
pas_valide File - Insecure storage 1 5% 4151 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 3697 20 Arod 3
pas_valide System - Android lock pattern 3% 2359 20 Silentd 3
pas_valide Transposition - Rail Fence 3% 2179 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 97 25 Tie21 1
pas_valide AES - ECB 1% 961 25 cez40 4
pas_valide LFSR - Known plaintext 1% 124 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1499 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 330 25 Zweisamkeit 2
pas_valide Service - Timing attack 2% 1186 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1315 25 koma 6
pas_valide Initialisation Vector 1% 678 25 notfound, manticore 3
pas_valide GEDEFU 1% 216 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 73 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 532 30 sambecks 1
pas_valide RSA - Common modulus 1% 424 30 franb 2
pas_valide Service - Hash length extension attack 1% 326 30 koma 1
pas_valide AES - 4 Rounds 1% 34 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 97 35 Tosh 0
pas_valide AES128 - CTR 1% 307 40 Tosh 1
pas_valide Discrete logarithm problem 1% 411 40 Thanat0s, RFC4949 2
pas_valide RSA - Corrupted key V2 1% 53 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 438 40 franb 3
pas_valide AES - Fault attack #1 1% 15 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 75 50 peyman 0
pas_valide ECDHE 1% 80 60 Tosh 2
pas_valide Service - CBC Padding 1% 501 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 223 60 Thanat0s 0
pas_valide AES - Weaker variant 1% 13 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 39 75 Revenger 1
pas_valide AES - Fault attack #2 1% 9 80 Cryptanalyse 0