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From HalfLife 2 Knowledge Base

Introduction

Valve uses encryption on its weapon script files in Counter-Strike: Source and Half-Life 2: Deathmatch. There is really only one reason for this and tahts to prevent clientside tampering of the weapons by modifying the amont of ammo or the player movement while equipped with a weapon. These files are found under the (mod folder)\scripts folder as ctx files.

To perform the this you will need this file: http://www.hl2world.com/bbs/dload.php?action=file&file_id=2615

This file goes into you %sorucesdk%\bin folder

Encrypting

%sourcesdk%\bin\vice.exe -x .abc -k xxxxxxxx "path\file.txt"

-x is stands for the encrypted file extension the standard is CTX, make sure you include the period before the extention

-k is the encryption key to decode the file in game. This key has to be 8 characters long using uper and lower case aphabet and numbers

Decrypting

%sourcesdk%\bin\vice.exe -d -x .txt -k xxxxxxxx "path\file.ctx"

-d designates that you are decrypting

-x is the file extension that the decrypted file is going to be

-k is designating the key that was used for exncryption

Valve keys

By: Omega552003