What is PKCS #11?
PKCS #11 is a cryptographic token interface standard, which specifies an API, called Cryptoki. With this API, applications can address cryptographic devices as tokens and can perform cryptographic functions as implemented by these tokens. This standard, first developed by the RSA Laboratories in cooperation with representatives from industry, science, and governments, is now an open standard lead-managed by the OASIS PKCS 11 Technical Committee.
It follows an object-based approach, addressing the goals of technology independence (any kind of HW device) and resource sharing. It also presents to applications a common, logical view of the device that is called a cryptographic token. PKCS #11 assigns a slot ID to each token. An application identifies the token that it wants to access by specifying the appropriate slot ID.
For more information about PKCS #11, refer to this URL: