i could not found exact steps for using pgp_sym_encrypt() and pgp_sym_decrypt()

[tushar nehete <tpnehete@xxxxxxxxx>]

Hi,
 i could not found exact steps for
 using pgp_sym_encrypt() and pgp_sym_decrypt().

I want to encrypt the data of column and then in a
 function  decrypt that column using pgp_sym_encrypt() and pgp_sym_decrypt() functions.
Its working fine with postgres 8.4 eg: select pgp_sym_encrypt('tushar','22');

Version of postgres is 9.0


Regards,
Tushar