passphrases. An object of this type is a passphrase recogniser: its
job is to recognise whether an offered passphrase is the right one.
For security, such passphrase recognisers usually do not themselves
know the passphrase they are looking for; they can merely recognise it
when they see it. There are many schemes in use to achieve this
effect, and the intent of this class is to provide a consistent
interface to them all, hiding the details.
The CPAN package Authen::Passphrase contains implementations of
several specific passphrase schemes in addition to the base class.
WWW: http://search.cpan.org/dist/Authen-Passphrase/
Approved by: erwin (mentor)
