Polyalphabetic substitution - One Time Pad

60 Points  

A Perfect cipher only if…

Author

Thanat0s,  

Level  Difficulty

Validations

255 Challengers 1%

Note  Notation

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70 Votes
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Solution  Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
Sacriyana   Substitution polyalphabétique - Masque jetable fr 5 August 2019 at 11:17
Cryptanalyse   Polyalphabetic substitution - One Time Pad en 3 August 2019 at 11:11
alice   Substitution polyalphabétique - Masque jetable fr 1 August 2019 at 16:08
VauDevil   Substitution polyalphabétique - Masque jetable fr 26 July 2019 at 12:03
Slangster   Polyalphabetic substitution - One Time Pad en 26 July 2019 at 11:58
hexabeast   Substitution polyalphabétique - Masque jetable fr 18 July 2019 at 22:32
BOOM   Substitution polyalphabétique - Masque jetable fr 12 July 2019 at 17:57
Bookie   Substitution polyalphabétique - Masque jetable fr 12 July 2019 at 16:37
skopsko   Substitution polyalphabétique - Masque jetable fr 25 June 2019 at 13:43
Skywhi   Substitution polyalphabétique - Masque jetable fr 28 April 2019 at 23:26

Challenges associated with this section 44 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 36657 5 Xartrick 10
pas_valide Encoding - UU 21% 29081 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 29802 5 g0uZ 6
pas_valide Hash - SHA-2 11% 14886 5 koma 4
pas_valide Shift cipher 7% 8802 10 m31z0nyx 5
pas_valide Pixel Madness 5% 7117 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 4104 15 Lu33Y 10
pas_valide File - PKZIP 4% 5251 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 5% 6856 15 Arod 4
pas_valide Known plaintext - XOR 3% 4309 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1630 20 Tosh 5
pas_valide File - Insecure storage 1 4% 4807 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4662 20 Arod 3
pas_valide System - Android lock pattern 3% 2992 20 Silentd 3
pas_valide Transposition - Rail Fence 2% 2821 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 293 25 Tie21 1
pas_valide AES - ECB 1% 1182 25 cez40 4
pas_valide LFSR - Known plaintext 1% 232 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1970 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 531 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1433 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1621 25 koma 6
pas_valide Initialisation Vector 1% 877 25 manticore, notfound 3
pas_valide GEDEFU 1% 276 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 118 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 674 30 sambecks 1
pas_valide RSA - Common modulus 1% 619 30 franb 2
pas_valide Service - Hash length extension attack 1% 406 30 koma 1
pas_valide AES - 4 Rounds 1% 87 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 123 35 Tosh 0
pas_valide AES128 - CTR 1% 374 40 Tosh 1
pas_valide Discrete logarithm problem 1% 499 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key V2 1% 91 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 576 40 franb 3
pas_valide AES - Fault attack #1 1% 45 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 99 50 peyman 1
pas_valide ECDHE 1% 111 60 Tosh 2
pas_valide Service - CBC Padding 1% 611 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 255 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 71 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 31 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 57 75 Revenger 1
pas_valide AES - Fault attack #2 1% 32 80 Cryptanalyse 0
pas_valide AES-PMAC 1% 7 100 Cryptanalyse 0