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Authen::PluggableCaptcha is a fully modularized and extensible system for making Pluggable Catpcha (Completely Automated Public Turing Test to Tell Computers and Humans Apart) tests. Pluggable? All Captcha objects are instantiated and interfaced via the main module, and then manipulated to require various submodules as plug-ins. Authen::PluggableCaptcha borrows from the functionality in Apache::Session::Flex

Business::PayPal::EWP - Perl extension for PayPal's Encrypted Website Payments with Encrypted Web Payments. It contains a single function, SignAndEncrypt which takes the plaintext form code, private key file, public key file, and PayPal's public certificate, and will return the signed and encrypted code needed by paypal.

The dining cryptographers' protocol is documented in Bruce Schneier's book as a kind of "cryptographic ouija board". It works as follows: A number of cryptographers are dining at a circular table. At the end of the meal, the waiter is summoned and asked for the bill. He replies, "Thank you, sir. The bill has been paid." The cryptographers now have the problem of working out whether someone at the table paid the bill, or whether the NSA has paid it as some sort of veiled threat. The protocol proceeds. Each cryptographer flips a coin, and shows the result ONLY to the participant on his RIGHT. Each cryptographer then compares his coin with that on his LEFT, and raises his hand if they show different faces. If any participant paid the bill, he "cheats" and does the opposite, that is, he raises his hand if the coins show the same face. Now, the hands are counted. An odd number means that someone at the table paid the bill. An even number means that the NSA paid.

Crypt-OpenSSL-CA - Model of an X509v3 Certification Authority This package performs the cryptographic operations necessary to issue X509 certificates and certificate revocation lists (CRLs). It is implemented as a Perl wrapper around the popular OpenSSL library. All certificate and CRL extensions supported by OpenSSL are available, and then some.

This module implements the twofish cipher in a less braindamaged (read: slow and ugly) way than the existing "Crypt::Twofish" module. Although it is "Crypt::CBC" compliant you usually gain nothing by using that module (except generality), since "Crypt::Twofish2" can work in either ECB or CBC mode.

Clamassassin is a simple virus filter wrapper for ClamAV for use in procmail filters and similiar applications. Clamassassin's interface is similiar to that of spamassassin, making it easy to implement for those familiar with that tool. Clamassassin is designed with an emphasis on security, robustness and simplicity.

Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled server applications. Applications built with NSS can support SSL v2 and v3, TLS, PKCS #5, PKCS #7, PKCS #11, PKCS #12, S/MIME, X.509 v3 certificates, and other security standards.

MD5 sums (see RFC 1321 - The MD5 Message-Digest Algorithm) are used as a one-way hash of data. Due to the nature of the formula used, it is impossible to reverse it. This module provides functions to search several online MD5 hashes database and return the results (or return undefined if no match found).

Digest::Pearson::PurePerl is an implementation of Peter K. Pearson's hash algorithm presented in "Fast Hashing of Variable Length Text Strings" - ACM 1990. This hashing technique yields good distribution of hashed results for variable length input strings on the range 0-255, and thus, it is well suited for data load balancing. If you prefer a fast implementation, you might want to consider Digest::Pearson instead.

Dancer::Plugin::Passphrase manages the hashing of passwords for Dancer apps, allowing developers to follow cryptography best practices without having to become a cryptography expert. It uses the bcrypt algorithm as the default, while also supporting any hashing function provided by Digest.