LINK: https://marketplace.yoyogames.com/assets/5294/aes-for-gamemaker AES for gamemaker is a free asset that anyone can use! It supports: ECB and CBC modes 128, 192 and 256 bit keys Hex and string formatting File encrypting/decrypting* Initialization vectors *Since Gamemaker studio is sandboxed, this will only encrypt/decrypt files in working_directory. With an i7 6700, this code can encrypt/decrypt an average of ~1kb/s. However the GM8 port runs faster at ~2.3kb/s. The GM8 port can be found here.