Arcade machines rely on robust encryption to protect their software from piracy, tampering, and unauthorized access. The most common types of encryption used in arcade machine software include:

1. AES (Advanced Encryption Standard) – A widely adopted symmetric encryption method that ensures fast and secure data protection, often used for safeguarding game code and assets.

2. RSA (Rivest-Shamir-Adleman) – An asymmetric encryption algorithm used for secure key exchanges and digital signatures, ensuring authenticity and integrity.

3. DES (Data Encryption Standard) – Though older, some legacy arcade systems still use DES for basic encryption needs.

4. Blowfish – A flexible symmetric cipher used in some arcade systems for its speed and efficiency in encrypting game data.

5. Custom Proprietary Encryption – Many arcade manufacturers implement unique encryption methods tailored to their hardware to prevent reverse engineering.

These encryption techniques help maintain the security and longevity of arcade games, ensuring fair play and protecting intellectual property. Understanding these methods is crucial for developers and enthusiasts alike.