Pam_p11 is a pluggable authentication module (PAM)
package for using cryptographic tokens such as
smart cards and USB crypto tokens for
authentication. Pam_p11 is very simple, as it has
no config file, no options other than the PKCS#11
module file, and does not know about certificate
chains, certificate authorities, revocation lists,
or OCSP. There is one module that uses the
$HOME/.eid/authorized_certificates file (like the
old pam_opensc did) and one module that uses the
$HOME/.ssh/authorized_keys file (like ssh does).
