Public-Key Cryptography Standard number 11 is one of the family of standards called Public-Key Cryptography Standards (PKCS). It defines a platform-independent API to cryptographic tokens, such as hardware security modules (HSM) and smart cards.

The PKCS #11 standard names the API "Cryptoki" which is an amalgamation of "cryptographic token interface" and is pronounced as "crypto-key", but "PKCS #11" is often used to refer to the API as well as the standard that defines it.

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