Service - Hash length extension attack

30 Points  

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

326 Challengers 1%

Note  Notation

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32 Votes
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Solution 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
Sgt. Pepper   Service - Hash length extension attack de 18 October 2018 at 19:10
meadori   Service - Hash length extension attack fr 16 October 2018 at 02:47
Landais   Service - Hash length extension attack en 15 October 2018 at 23:09
Chervaliery   Service - Hash length extension attack fr 15 October 2018 at 15:47
gwel   Service - Hash length extension attack fr 15 October 2018 at 12:56
LazySloth   Service - Hash length extension attack fr 14 October 2018 at 17:50
Hypnoze   Service - Hash length extension attack fr 12 October 2018 at 16:05
nonstandardmodel   Service - Hash length extension attack en 4 October 2018 at 21:38
PiAil   Service - Hash length extension attack en 19 September 2018 at 16:41
dali1999   Service - Hash length extension attack fr 31 August 2018 at 22:46

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% 26971 5 Xartrick 10
pas_valide Encoding - UU 22% 21600 5 g0uZ 10
pas_valide Hash - Message Digest 5 23% 22314 5 g0uZ 5
pas_valide Hash - SHA-2 12% 11344 5 koma 3
pas_valide Shift cipher 7% 6678 10 m31z0nyx 5
pas_valide Pixel Madness 6% 5430 15 Ryscrow 10
pas_valide ELF32 - PID encryption 4% 3394 15 Lu33Y 10
pas_valide File - PKZIP 5% 4027 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 5375 15 Arod 4
pas_valide Known plaintext - XOR 4% 3401 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1292 20 Tosh 4
pas_valide File - Insecure storage 1 5% 4152 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 3698 20 Arod 3
pas_valide System - Android lock pattern 3% 2360 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% 1187 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% 98 35 Tosh 0
pas_valide AES128 - CTR 1% 307 40 Tosh 1
pas_valide Discrete logarithm problem 1% 412 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