References

Bruce Schneier. Applied Cryptography. Wiley, 1996.
NIST PKI Program. Available at: http://csrc.nist.gov/pki/
IETF PKIX Working Group. Available at: http://www.ietf.org/html.charters/pkix-charter.html
Digest SASL Mechanism. Available at: http://www.ietf.org/rfc/rfc2831.txt
Passphrase FAQ. Available at: http://www.stack.nl/~galactus/remailers/passphrase-faq.html
Java references