Polyalphabetic substitution - One Time Pad

60 Points  

A Perfect cipher only if…

Author

Thanat0s,  

Level  Difficulty

Validations

234 Challengers 1%

Note  Notation

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61 Votes
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Solution  Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
benoit   Polyalphabetic substitution - One Time Pad en 5 January 2019 at 08:55
$in   Substitution polyalphabétique - Masque jetable fr 5 January 2019 at 00:13
pmonti   Substitution polyalphabétique - Masque jetable fr 4 January 2019 at 23:15
Simon   Polyalphabetic substitution - One Time Pad en 4 January 2019 at 20:55
xvCritical   Substitution polyalphabétique - Masque jetable fr 29 December 2018 at 17:30
r1_   Substitution polyalphabétique - Masque jetable fr 29 December 2018 at 10:16
LazySloth   Substitution polyalphabétique - Masque jetable fr 6 December 2018 at 12:16
2phi   Substitution polyalphabétique - Masque jetable fr 3 December 2018 at 15:00
pouf   Substitution polyalphabétique - Masque jetable fr 3 December 2018 at 07:47
Nofix   Polyalphabetic substitution - One Time Pad en 30 November 2018 at 17:16

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% 30456 5 Xartrick 10
pas_valide Encoding - UU 21% 24288 5 g0uZ 10
pas_valide Hash - Message Digest 5 22% 24974 5 g0uZ 6
pas_valide Hash - SHA-2 11% 12529 5 koma 3
pas_valide Shift cipher 7% 7406 10 m31z0nyx 5
pas_valide Pixel Madness 6% 6002 15 Ryscrow 10
pas_valide ELF64 - PID encryption 4% 3594 15 Lu33Y 10
pas_valide File - PKZIP 4% 4434 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 5862 15 Arod 4
pas_valide Known plaintext - XOR 4% 3705 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1389 20 Tosh 4
pas_valide File - Insecure storage 1 4% 4340 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4002 20 Arod 3
pas_valide System - Android lock pattern 3% 2536 20 Silentd 3
pas_valide Transposition - Rail Fence 3% 2385 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 137 25 Tie21 1
pas_valide AES - ECB 1% 1014 25 cez40 4
pas_valide LFSR - Known plaintext 1% 146 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1634 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 385 25 Zweisamkeit 3
pas_valide Service - Timing attack 2% 1261 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1399 25 koma 6
pas_valide Initialisation Vector 1% 728 25 manticore, notfound 3
pas_valide GEDEFU 1% 232 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 89 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 576 30 sambecks 1
pas_valide RSA - Common modulus 1% 485 30 franb 2
pas_valide Service - Hash length extension attack 1% 342 30 koma 1
pas_valide AES - 4 Rounds 1% 53 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 106 35 Tosh 0
pas_valide AES128 - CTR 1% 335 40 Tosh 1
pas_valide Discrete logarithm problem 1% 431 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key V2 1% 65 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 485 40 franb 3
pas_valide AES - Fault attack #1 1% 26 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 86 50 peyman 0
pas_valide ECDHE 1% 89 60 Tosh 2
pas_valide Service - CBC Padding 1% 528 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 234 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 47 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 21 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 46 75 Revenger 1
pas_valide AES - Fault attack #2 1% 19 80 Cryptanalyse 0