An RSA Security, Inc., Public-Key Cryptography Standards (PKCS) specification that defines an application programming interface (API), called Cryptoki, to devices which hold cryptographic information and perform cryptographic operations. See PCMCIA cards

Public-Key Cryptography Standard #11. The standard developed by RSA Laboratories that governs communication with cryptographic tokens (such as smart cards).

Public key standard which defines communication methods with cryptographic devices such as smart cards.