Service - Hash length extension attack

30 Points  

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

311 Challengers 1%

Note  Notation

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30 Votes
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Solution 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
r1_   Service - Hash length extension attack fr 14 August 2018 at 19:10
LordRoke   Service - Hash length extension attack fr 14 August 2018 at 13:56
corpsfini   Service - Hash length extension attack fr 11 August 2018 at 12:04
yehuju   Service - Hash length extension attack fr 10 August 2018 at 09:25
VioletBaudelaire   Service - Hash length extension attack fr 8 August 2018 at 16:32
zemissa   Service - Hash length extension attack en 8 August 2018 at 14:21
Macmod   Service - Hash length extension attack en 6 August 2018 at 20:21
Max   Service - Hash length extension attack en 1 August 2018 at 23:37
Cryptanalyse   Service - Hash length extension attack fr 30 July 2018 at 14:12
TraaaxX   Service - Hash length extension attack fr 29 July 2018 at 17:03

Challenges associated with this section 38 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 25194 5 Xartrick 10
pas_valide Encoding - UU 22% 20200 5 g0uZ 9
pas_valide Hash - Message Digest 5 23% 20909 5 g0uZ 4
pas_valide Hash - SHA-2 12% 10565 5 koma 3
pas_valide Shift cipher 7% 6262 10 m31z0nyx 5
pas_valide Pixel Madness 6% 5021 15 Ryscrow 10
pas_valide ELF32 - PID encryption 4% 3282 15 Lu33Y 10
pas_valide File - PKZIP 5% 3763 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 5099 15 Arod 4
pas_valide Known plaintext - XOR 4% 3226 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1230 20 Tosh 4
pas_valide File - Insecure storage 1 5% 3979 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 3504 20 Arod 3
pas_valide System - Android lock pattern 3% 2225 20 Silentd 2
pas_valide Transposition - Rail Fence 3% 2062 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 67 25 Tie21 0
pas_valide AES - ECB 1% 916 25 cez40 4
pas_valide LFSR - Known plaintext 1% 112 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1436 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 309 25 Zweisamkeit 2
pas_valide Service - Timing attack 2% 1143 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1267 25 koma 6
pas_valide Initialisation Vector 1% 654 25 notfound, manticore 3
pas_valide GEDEFU 1% 201 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 65 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 518 30 sambecks 1
pas_valide RSA - Common modulus 1% 400 30 franb 2
pas_valide Service - Hash length extension attack 1% 311 30 koma 1
pas_valide RSA - Padding 1% 90 35 Tosh 0
pas_valide AES128 - CTR 1% 294 40 Tosh 1
pas_valide Discrete logarithm problem 1% 398 40 Thanat0s, RFC4949 2
pas_valide RSA - Corrupted key V2 1% 45 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 419 40 franb 3
pas_valide Enigma Machine 1% 65 50 peyman 0
pas_valide ECDHE 1% 78 60 Tosh 1
pas_valide Service - CBC Padding 1% 492 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 215 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 35 75 Revenger 1