you can encrypt your password using blowfish using a key of your choosing:

cl-user(1): (setq encr (excl:blowfish-encrypt "mypass" :key "decryptkey"))

#(168 215 26 129 6 186 115 28)



When your application starts up it can ask for the key or it can read
it from a file that's only readable by you and then it can recover 
your password

cl-user(2): (excl:blowfish-decrypt 
                (make-array 8 
                    :element-type '(unsigned-byte 8) 
                    :initial-contents '(168 215 26 129 6 186 115 28)) 
                :key "decryptkey" :string t)

"mypass"