Danofred's KeygenMe-01

Author:
Danofred

Language:
C/C++

Upload:
2022-02-20 11:53

Download

Platform:
Windows

Difficulty:
2.4

Quality:
3.0

Arch:
x86-64

Downloads:
23

Size:
41.34 KB

Writeups:
1

Comments:
13

Description

Simple KeygenMe for you ! For more about this, see the rules on this program! --- DON'T PATCH IT :) Good luck

Comments (13)
Writeups (1)

You must be logged in to post a comment

DaBaddest on 2022-02-22 15:13: I cant run this because Im on linux. Is this a valid pair? username: crackmes.one password: r.crmesoko.s

chkdsk on 2022-02-22 16:49: DaBaddest : yes, your pair is valid

Danofred on 2022-02-23 14:37: yes, it's valid

yovimi on 2022-02-26 05:15: [Click to reveal]

JamesBond008 on 2022-02-27 00:08: /* Feb-26-2022 By JamesBond008 Solution (KeyGen.cpp) to ***************************** KEYGEN ME By @Danofred Powered by crackmes.one Difficulty : 3.0 ***************************** Examples of the UserName/Key Pairs generated by this KeyGen: JamesBond007 / de7n0s0dooo0 Cool-You-Did-It / t--Iiu-oi-ioi-Y WhatsUpNext / WsaWpaNNptW Thanks Danofred for the nice KeyGenMe to practice one's skill to make a KeyGen. */ #include #include char* keygen(char* UserName) { char Key[256] = ""; int UserNameLength; int EncryptKeyLength; int i; EncryptKeyLength = strlen("tryHarderToMakeAGoodKeyGen"); // = 26 // ONLY length of the EncryptKey string matters! So the following will generate the same key as above. // EncryptKeyLength = strlen("--------------------------"); // = 26 UserNameLength = strlen(UserName); for (i = 0; i NameEntered; std::cout

JamesBond008 on 2022-02-27 00:09: #include #include char* keygen(char* UserName) { char Key[256] = ""; int UserNameLength; int EncryptKeyLength; int i; EncryptKeyLength = strlen("tryHarderToMakeAGoodKeyGen"); // = 26 // ONLY length of the EncryptKey string matters! So the following will generate the same key as above. // EncryptKeyLength = strlen("--------------------------"); // = 26 UserNameLength = strlen(UserName); for (i = 0; i NameEntered; std::cout

DaBaddest on 2022-02-28 14:43: [Click to reveal]

Sidd_Tim on 2022-03-10 10:34: [Click to reveal]

mara on 2022-03-13 14:39: I need to patch the binary. You're allocation is not initialized with zero values. The beaviour the password can not validated correctly.

Edza on 2022-03-19 08:45: [Click to reveal]

1337ReverseEngineer on 2022-07-20 16:48: EASY! My python keygen: [python] seed = "tryHarderToMakeAGoodKeyGen" seed_len = len(seed) username = "dqwd12d12t123t" username_len = len(username) encrypted = "" for i in range(username_len): a = username[i] a = ord(a) ^ seed_len rem = a % username_len encrypted += username[rem] print(encrypted) [/python] 1. use username string of your choice 2. input that string into the crackme too 3. run python program and copy the printed string into the program (password)

jeffli6789 on 2026-01-04 06:25: This crackme had been reviewed when it was originally approved and is likely safe. Crackmes often get flagged by antivirus software, EDR systems, or VirusTotal because they may use the same protection techniques found in malware (packers, anti-debugging, self-modifying code, etc.), or simply a false positive. This does NOT mean the crackme is actually malicious. The only way to confirm whether something is truly malware is to reverse engineer it and find proof of malicious code and/or malicious behavior. If you still believe this is actual malware, please report it to us via email: crackmesone@gmail.com. **We encourage everyone to run crackmes in a VM (virtual machine) and exercise caution when executing unknown binaries.** *Disclaimer: We do our best to review submissions, but mistakes can happen. The administrators and crackmes.one cannot be held liable for any damages or losses resulting from the use of files downloaded from this site. Always exercise caution and use a sandboxed environment.*

Show all spoilers

You must be logged in to submit a writeup

Solution by ThePhilosopher on 2022-03-13 12:21:
A write up and a keygen for this challenge

Download