RedXen's Genuine License Service

Author:
RedXen

Language:
.NET

Upload:
2023-03-28 11:04

Download

Platform:
Windows

Difficulty:
1.5

Quality:
4.2

Arch:
x86-64

Downloads:
37

Size:
118.00 KB

Writeups:
1

Comments:
13

Description

This CrackMe is meant to be similar to a real-world license activation system - just for a bit of fun! :). Hope you enjoy it. Rules: YOU MUST MAKE A KEYGEN. PATCHING IS NOT ALLOWED. GOOD LUCK!

Comments (13)
Writeups (1)

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Sm0key on 2023-03-30 15:43: https://pastebin.com/Saj9g0fq

Sm0key on 2023-03-30 15:59: [Click to reveal]

pavler on 2023-04-01 18:12: using System; using System.Security.Cryptography; using System.Text; namespace Genuine_License_Service { class Program { static void Main(string[] args) { Console.Write("username: "); string username = Console.ReadLine(); string licenseKey = GenerateSerialKey(username); Console.WriteLine("ur key : " + licenseKey); Console.ReadKey(); } private static string GenerateSerialKey(string username) { byte[] hash = ComputeHash(username); string key = BitConverter.ToString(hash) .Replace("-", "") .Substring(0, 15) .Insert(5, "-") .Insert(11, "-"); return key; } private static byte[] ComputeHash(string input) { using (SHA256 shA256 = SHA256.Create()) { byte[] bytes = Encoding.UTF8.GetBytes(input); return shA256.ComputeHash(bytes); } } } }

Arkanwhtp on 2023-04-13 08:09: Nice crackme Decision: https://pastebin.com/NtrQgxRY

lylcrackmes on 2023-04-15 07:40: Nice

byclone on 2023-04-15 21:05: [Click to reveal]

Oxygen6 on 2023-04-16 22:50: My keygen: https://pastebin.com/raw/wnAPgykn

Fire_Jasper770 on 2023-04-28 17:52: Simple solution is using dnspy go to activation failed and change MessageBox.Show("Software activation failed. Invalid license key.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Hand); to MessageBox.Show(LicenseManager.GenerateSerialKey(this.userNameTextBox.Text), "Error", MessageBoxButtons.OK, MessageBoxIcon.Hand); it is just changing to error message "Software activation failed. Invalid license key." to LicenseManager.GenerateSerialKey(this.userNameTextBox.Text) which generates a key for the specified username

Tyfo on 2023-05-24 09:12: Keygen code - https://pastebin.com/9pLdriR4 Link password - crackmes.one

DZghost on 2023-06-10 11:04: [Click to reveal]

bang1338 on 2023-08-11 13:52: solved!

AlyAnt0 on 2025-04-16 19:19: i made a keygen in haxe https://pastebin.com/U7gtBTmL

MasterEditor on 2025-07-20 11:49: string GenerateKey(string username) { return BitConverter.ToString(GenerateKeyFromUsernmae(username)).Replace("-", "").Substring(0, 15) .Insert(5, "-") .Insert(11, "-"); } byte[] GenerateKeyFromUsernmae(string input) { byte[] array; using (SHA256 sha = SHA256.Create()) { byte[] bytes = Encoding.UTF8.GetBytes(input); array = sha.ComputeHash(bytes); } return array; }

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Solution by bang1338 on 2023-08-11 13:52:
A writeup of my process and solution. In zip file contain: - Bunch of image instead hosted on Discord - a markdown, which is my writeup and solution. Require a GitHub-like markdown reader like Markdown Monster - Python script for keygen, require Python 3.x

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