While searching a PGP Public Key Server, I realized it would be possible for spammers to get e-mail addresses from a keyserver and send encrypted spam e-mails, which will not be detected by antispam software, as content-analysis would be impossible. Scary.
I have started a new open source project: The Digest Software Project. It’s a small project where I develop two tiny libraries, libdigest and libpam-digestfile.
libpam-digestfile is a Pluggable Authentication Module which lets you use an arbitrarily-named text file similar in structure to /etc/passwd to authenticate users but using digested passwords (see RFC 2617 for more information about the digest algorithm).
Both libraries are stable and in production.