Kryptos's Simple login crackme

Author:
Kryptos

Language:
C/C++

Upload:
2026-04-16 19:59

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Platform:
Windows

Difficulty:
2.8

Quality:
5.2

Arch:
x86-64

Downloads:
960

Size:
18.50 KB

Writeups:
4

Comments:
8

Description

This crackme asks for a username and a password. The password is derived from the username by an internal validation routine. The goal is to recover the rule used to generate the correct password for any given username.

Comments (8)
Writeups (4)

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MemoryAgent on 2026-04-17 04:15: [Click to reveal]

liboxin on 2026-04-17 05:33: User: 123 Pass: 49307604 Access granted

@mike on 2026-04-18 00:19: [Click to reveal]

frogolonso on 2026-04-19 14:42: [Click to reveal]

Avios on 2026-04-23 14:44: [Click to reveal]

OmarDecryptX on 2026-04-24 07:22: User: aa Pass: 12832705 Access granted

listn on 2026-05-10 10:03: found the algo in main, it hashes the username with some multiply/xor shit (×1337 then xor 0x5A5A) and that's your password. just used user 123

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Solution by DevVolodya on 2026-04-17 16:18:
This file contains the full details of how I achieved recognition of the algorithm and the ready-made keygen script.

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Solution by Ap0dexMe0 on 2026-04-17 23:23:
https://thatnoteasy.github.io/

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Solution by markoc on 2026-04-27 14:10:
https://github.com/markoglasgow/gemma_crackme_tutorial

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Solution by marco007 on 2026-05-05 11:19:
This was a fun crackme to solve, I wrote a keygen in C++ after I figured out the algorithm used, quite simple but fun

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crackmes.one

crackmes.one

Kryptos's Simple login crackme