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Crypt::OpenSSL::RSA provides the ability to RSA encrypt strings which are somewhat shorter than the block size of a key. It also allows for decryption, signatures and signature verification.

A simple implementation of the RC4 algorithm, developed by RSA Security, Inc. Here is the description from RSA's website: RC4 is a stream cipher designed by Rivest for RSA Data Security (now RSA Security). It is a variable key-size stream cipher with byte-oriented operations. The algorithm is based on the use of a random permutation. Analysis shows that the period of the cipher is overwhelmingly likely to be greater than 10100. Eight to sixteen machine operations are required per output byte, and the cipher can be expected to run very quickly in software. Independent analysts have scrutinized the algorithm and it is considered secure. Based substantially on the "RC4 in 3 lines of perl" found at http://www.cypherspace.org Seamus Venasse <svenasse@polaris.ca>

The axTLS project is an SSL client/server library using the TLSv1 protocol. It is designed to be small and fast, and is suited to embedded projects. A web server is included.

This is a pure perl implementation of the new AES Rijndael. You want to use Crypt::Rijndael where available. This implementation is really slow, but I am working on it.

The current MD5 module is just a wrapper around the Digest::MD5 module. It is provided so that legacy code that rely on the old interface still work and get the speed benefit of the new module.

Digest::DJB is an implementation of D. J. Bernstein's hash which returns a 32-bit unsigned value for any variable-length input string. An equivalent pure Perl version is also available: Digest::DJB::PurePerl.

Provides an interface to the bcrypt digest algorithm. This module subclasses Digest::base and can be used either directly or through the Digest meta-module. Using the latter is recommended. It is mostly a wrapper around Crypt::Eksblowfish::Bcrypt.

Filter::CBC is a Source filter that uses Cipher Block Chaining (CBC) to encrypt your code. The tricky part is that most CBC Algorithms have binary output. The textmode bypasses this obstacle, by converting the data to less scary data.

A Perl module wrapping libzxid. Also zxid.pl, that implements SP in mod_perl environment, is supplied. This module is also available on CPAN at http://search.cpan.org/dist/zxid/.

The pam_krb5 module allows PAM-aware applications to authenticate users by performing an AS exchange with a Kerberos KDC. This module includes many configurable options and provides functionality and features that other pam_krb5 modules do not provide.