Gnupg-pkcs11-scd is a drop-in replacement for the smart-card daemon (scd) shipped with GnuPG. The daemon interfaces to smart-cards by using RSA Security Inc. PKCS#11 Cryptographic Token Interface (Cryptoki).

The daemon is a proxy into gnupg-pkcs11-scd-proxy-server which can be run within different security context to load the gnupg-pkcs11-scd smart-card daemon.