Service - Hash length extension attack

30 Points  0x0

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

570 Challengers 1%

Note  Notation

1
2
3
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5
51 Votes

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 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
face0xff   Service - Hash length extension attack 14 September 2020 at 18:37
Arky   Service - Hash length extension attack 13 September 2020 at 23:57
floflos   Service - Hash length extension attack 13 September 2020 at 21:51
Xlitoni   Service - Hash length extension attack 11 September 2020 at 08:41
CyBeer   Service - Hash length extension attack 6 September 2020 at 16:22
rbtw   Service - Hash length extension attack 30 August 2020 at 17:51
0xSs0rZ   Service - Hash length extension attack 29 August 2020 at 12:43
John Russel   Service - Hash length extension attack 26 August 2020 at 18:11
psaladin   Service - Hash length extension attack 26 August 2020 at 11:59
juleko   Service - Hash length extension attack 26 August 2020 at 10:42

 50 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 49089 5 Xartrick 10
pas_valide Encoding - UU 21% 38519 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 38994 5 g0uZ 6
pas_valide Hash - SHA-2 11% 19893 5 koma 4
pas_valide Shift cipher 7% 12120 10 m31z0nyx 8
pas_valide Pixel Madness 5% 9563 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 5210 15 Lu33Y 10
pas_valide File - PKZIP 4% 7184 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 9142 15 Arod 4
pas_valide Known plaintext - XOR 3% 5515 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 2107 20 Tosh 5
pas_valide File - Insecure storage 1 4% 5807 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 6123 20 Arod 3
pas_valide System - Android lock pattern 3% 3982 20 Silentd 4
pas_valide Transposition - Rail Fence 2% 3728 20 YellowS4 3
pas_valide AES - CBC - Bit-Flipping Attack 1% 625 25 Tie21 1
pas_valide AES - ECB 1% 1570 25 cez40 4
pas_valide LFSR - Known plaintext 1% 447 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2586 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 838 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1756 25 g0uZ, koma 4
pas_valide Monoalphabetic substitution - Polybe 2% 2164 25 koma 6
pas_valide Twisted secret 1% 29 25 nonstandardmodel 0
pas_valide Initialisation Vector 1% 1183 25 manticore, notfound404 5
pas_valide GEDEFU 1% 392 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 207 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 876 30 sambecks 1
pas_valide RSA - Common modulus 1% 915 30 franb 2
pas_valide Service - Hash length extension attack 1% 570 30 koma 1
pas_valide AES - 4 Rounds 1% 149 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 120 35 Jrmbt 1
pas_valide RSA - Padding 1% 168 35 Tosh 0
pas_valide RSA - Signature 1% 60 35 s4r 1
pas_valide AES128 - CTR 1% 457 40 Tosh 1
pas_valide Discrete logarithm problem 1% 618 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 139 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 69 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 778 40 franb 3
pas_valide AES - Fault attack #1 1% 79 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 142 50 peyman 2
pas_valide ECDHE 1% 142 60 Tosh 2
pas_valide RSA - Lee cooper 1% 61 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 779 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 287 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 104 60 Cryptanalyse 3
pas_valide AES - Weaker variant 1% 48 70 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 79 75 Revenger 1
pas_valide AES - Fault attack #2 1% 56 80 Cryptanalyse 1
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 18 100 Tosh 0