The IBM 4758 PCI Cryptographic Coprocessor is a secure cryptoprocessor implemented on a high-security, tamper resistant, programmable PCI expansion card. Specialized cryptographic electronics, microprocessor, memory, and random number generator housed within a tamper-responding environment provide a highly secure subsystem in which data processing and cryptography can be performed.

IBM supplies two cryptographic-system implementations, and toolkits for custom application development:

As of June 2005, the 4758 was discontinued and was replaced by an improved, faster model called the IBM 4764.