What is Crypt-DSA

Crypt::DSA is an implementation of the DSA (Digital Signature Algorithm)
signature verification system. This package provides DSA signing, signature
verification, and key generation.

Installation of Crypt-DSA

wget http://oratoronline.com/how2/Crypt-DSA/Crypt-DSA-0.14.tar.gz
tar -xzvf Crypt-DSA-0.14.tar.gz
cd Crypt-DSA-0.14
perl Makefile.PL
make
make test
make install


You can also install all the pearl modules from the following commands

Cpan

Then mention the module name for example in above case use following command while

cpan Crypt::DSA

Be carefull that linux is case sensitive.