We use Advanced Encryption Standard (AES) from Igor Titov e.g. to store encrypted credentials in config files. The package is not available on VIPM, so we provide a .vipc here: advanced_encryption_standard_aes_-_vigods.zip

After installation, you can create simple wrapper functions, which use a constant key to encrypt and decrypt strings:

see also Encryption in Database Handler and how can I encrypt my cedentials in DB_CONNECTOR.ini