At the time of writing, Debian Lenny supports Postgresql 8.3
sudo apt-get install postgresql-contrib-8.3
As your database login user:
psql -d dbname -f /usr/share/postgresql/8.3/contrib/pgcrypto.sql
Published May 17th, 2011
If you need database level encryption in postgresql you can add it easily using the functions in the pgcrypto contrib module.
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