deb..deb cryptohackery

[Nick Herring <nickh@hyperlink.com>]

ddd 3.0 core dumps when I select programs > run menu for command line
arguements, so I have obtained a binary copy of ddd version 3.2.1 which
is encrypted as a file with deb..deb extention -

ddd_3.2.1-3.deb..deb

the website (http://cgi.debian.org/cgi-bin/download.pl) has posted a
md5sum code for this file

How do I extract the file from this? 

I have already downloaded the source but it won't configure because lex
is missing. So I can't build. And our systems dept have a load of work
on so it won't get done for a while by them. So I need the binary.

Thanx

Nick