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.
