Encryption Methods

Encryption Methods

The methods listed below are known algorithms of encryption/decryption and obfuscation employed by CatSystem2 in one or more file types. Exposed class structures are included in many pages to facilitate the use of these algorithms in code samples.

Entry	Topic
Beaufort cipher	Symmetric cipher to encrypt CatSystem2 text data.
Blowfish cipher	Symmetric cipher to encrypt CatSystem2 binary data.
CRC‐32/CS2	Modified CRC-32 checksum to convert V_CODEs to seeds for Mersenne Twister.
Mersenne Twister	Pseudo-Random number generator used to create random cipher keys.
XOR cipher	Simple encryption method of XOR'ing individual bytes or values, has various uses

Structures using encryption

The topics below cover formats and information CatSystem2 performs encryption on.

Entry	Topic
V_CODEs	Game ID strings used to generate seeds for Mersenne Twister.
Key Files	Verification files checked on launch by CatSystem2.
KIF Archive	Game archives containing all assets, and the brunt of most encryption.
CsPack Archive	Old game archives, using XOR encryption for file data offsets
Brute Forcing KIF Archives	Discussion on the possibilities of brute forcing the the filename encryption in KIF Archives, due to the simplicity of Beaufort ciphers.