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The S/390 CMOS Cryptographic Coprocessor is an integrated high performance, physically secure cryptographic coprocessor available standard on S/390 CMOS Enterprise Servers. High performance functions utilizing DES, Triple DES, MAC, SHA-1, DSS, RSA Signature Generation and Verification, and various hashing, PIN, Key Management, Secure Master Key entry, and Random Number Generation are available in a secure and robust fault tolerant design.