I had some passwords saved in remmina but like it always happen, I wasn’t been able to remember them when needed. Trying to restore them I found that they’re encrypted in .remmina directory.

Then I used this script to the decrypt them 1:

Extract script
import base64
from Crypto.Cipher import DES3

secret = base64.decodestring("<STRING FROM remmina.prefs>")
password = base64.decodestring("<STRING FROM XXXXXXX.remmina>")

print DES3.new(secret[:24], DES3.MODE_CBC, secret[24:]).decrypt(password)