FIPS standards for cryptographic security. FIPS 140-2 provides four security levels, each adding functions to the previous level. See FIPS
Level 1 - Basic encryption such as a PC encryption board.
Level 2 - Provides evidence of elementary tampering.
Level 3 - Prevents access to critical security parameters (CSPs) such as passwords.
Level 4 - Provides evidence of all attempts at tampering.