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You can set an encryption password with the database_cipher_key key in your config/configuration.yml file. After setting this key, you can encrypt existing passwords in your database with this key by running `rake db:encrypt RAILS_ENV=production`.

See the commented example in config/configuration.yml.example:

# Key used to encrypt sensitive data in the database (SCM passwords,
# LDAP passwords, and TOTP (two-factor authentication) secret keys).
# If you don't want to enable data encryption, just leave it blank.
# WARNING: losing/changing this key will make encrypted data unreadable.
#
# If you want to encrypt existing data in your database:
# * set the cipher key here in your configuration file
# * encrypt data using 'rake db:encrypt RAILS_ENV=production'
#
# If you have encrypted data and want to change this key, you have to:
# * decrypt data using 'rake db:decrypt RAILS_ENV=production' first
# * change the cipher key here in your configuration file
# * encrypt data using 'rake db:encrypt RAILS_ENV=production'