Silva97's login-cipher

Author:
Silva97

Language:
C/C++

Upload:
2019-10-24 00:26

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Platform:
Unix/linux etc.

Difficulty:
3.0

Quality:
4.0

Arch:
x86-64

Downloads:
13

Size:
13.98 KB

Writeups:
5

Comments:
8

Description

ELF64 program. You have to insert the correct password. To submit your solution, explain what you did to get the password or write a script to decrypt it. Don't patch! Your hand go break if you do it.

Comments (8)
Writeups (5)

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BinaryNewbie on 2019-11-10 21:30: Done, i will publish my solution soon. It isn't lv3, it's lv2, but nice crackme at all.

BinaryNewbie on 2019-11-10 21:33: cat password.txt |./login Don't patch it! Insert your password: Correct!

drunkenmyno on 2019-11-21 13:13: Breakpoint on 0x555555555434: cmp DWORD PTR [rbp-0x4],eax Comapre each byte with cipher or use decrypt Routine [root@web ~]# cat ciper.txt | ./login Don't patch it! Insert your password: Correct! [root@web ~]#

Mukesh on 2019-11-25 05:21: Any one say please how to change ELf File to normal understanding file or source code file .

Vadym on 2019-12-21 11:26: I found password, but I can't find button to submit solution. https://crackmes.one/faq Then, you can upload your solution on the crackme page. How can I do it ? Or simply leave comment ?

Vadym on 2019-12-21 11:32: I found tab "Solution"

rustymagnet on 2020-02-21 13:51: Excellent crackme @Silva97

jeffli6789 on 2020-04-04 05:15: nice one! Though the algorithm is not complex.

You must be logged in to submit a writeup

Solution by BinaryNewbie on 2019-11-10 23:47:
It contains a simple write-up, the correct password and 2 python scripts.

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Solution by Vadym on 2019-12-21 11:59:
It contains a simple write-up, the correct password

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Solution by yakovdk on 2020-02-11 02:58:
I used a debugger to run the string decode function on each of the encoded strings until I found the password value. Details in the attached text file.

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Solution by 4rr4y on 2020-02-27 02:50:
thanks for nice crackme, learnt something :) ~

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Solution by karcher on 2020-07-01 21:25:
RE with Ghydra, decoder implementation in python

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