🚀 go-pugleaf

keith.willis@almac.co.uk wrote:
: 
: 
:         I have come across an implementation of RSA distributed by a
:         company in Wales, UK, which claims to perform RSA encryption
:         on the entire file, rather than just on a session key for a
:         conventional algorithm.  The program may be common knowledge,
:         but it is the first time I have come across it.  It is called
:         MCRYPT, and is distributed by a company called Digital
:         Crypto as shareware.
: 
:         What puzzles me is that encryption is very fast - less than 2
:         minutes for a 40k text file using a 250 digit key - but
:         decryption is _glacial_ - over 3 hours for the same file on
:         the same PC.

That's what you would expect if they are using a small encryption
exponent (such as 3 or 65537.)  This is common practice.  Decryption
and authentication require a full length modular exponentiation.

Andrew.