Service - Hash length extension attack

30 Points  

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

441 Challengers 1%

Note  Notation

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39 Votes
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Solution 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
petithomme2005   Service - Hash length extension attack fr 12 November 2019 at 20:50
zTeeed   Service - Hash length extension attack fr 12 November 2019 at 12:24
Headorteil   Service - Hash length extension attack fr 12 November 2019 at 02:16
isec   Service - Hash length extension attack en 6 November 2019 at 18:09
@nthr@x   Service - Hash length extension attack en 24 October 2019 at 21:41
teemo   Service - Hash length extension attack fr 23 October 2019 at 18:47
Bmantra   Service - Hash length extension attack en 23 October 2019 at 10:57
Superior   Service - Hash length extension attack en 22 October 2019 at 18:45
H@Ck3!D   Service - Hash length extension attack en 18 October 2019 at 13:43
Djayk   Service - Hash length extension attack fr 16 October 2019 at 12:07

Challenges associated with this section 48 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 39790 5 Xartrick 10
pas_valide Encoding - UU 20% 31539 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 32274 5 g0uZ 6
pas_valide Hash - SHA-2 11% 16153 5 koma 4
pas_valide Shift cipher 7% 9649 10 m31z0nyx 6
pas_valide Pixel Madness 5% 7725 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 4396 15 Lu33Y 10
pas_valide File - PKZIP 4% 5703 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 5% 7378 15 Arod 4
pas_valide Known plaintext - XOR 3% 4580 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1724 20 Tosh 5
pas_valide File - Insecure storage 1 4% 5004 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4985 20 Arod 3
pas_valide System - Android lock pattern 3% 3196 20 Silentd 3
pas_valide Transposition - Rail Fence 2% 3012 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 348 25 Tie21 1
pas_valide AES - ECB 1% 1267 25 cez40 4
pas_valide LFSR - Known plaintext 1% 268 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2082 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 584 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1490 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1720 25 koma 6
pas_valide Initialisation Vector 1% 941 25 manticore, notfound 4
pas_valide GEDEFU 1% 304 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 138 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 719 30 sambecks 1
pas_valide RSA - Common modulus 1% 675 30 franb 2
pas_valide Service - Hash length extension attack 1% 441 30 koma 1
pas_valide AES - 4 Rounds 1% 106 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 55 35 Jrmbt 0
pas_valide RSA - Padding 1% 134 35 Tosh 0
pas_valide AES128 - CTR 1% 390 40 Tosh 1
pas_valide Discrete logarithm problem 1% 515 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 97 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 35 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 603 40 franb 3
pas_valide AES - Fault attack #1 1% 52 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 110 50 peyman 1
pas_valide ECDHE 1% 119 60 Tosh 2
pas_valide RSA - Lee cooper 1% 15 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 633 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 264 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 89 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 36 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 60 75 Revenger 1
pas_valide AES - Fault attack #2 1% 34 80 Cryptanalyse 0
pas_valide AES-PMAC 1% 8 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 12 100 Tosh 0