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Cloned from launchpad blueprint https://blueprints.launchpad.net/keystone/+spec/encryption+preferences. Description: Volume encryption is a candidate for Havana. While is possible to specify encryption parameters such as algorithm, key-size, keys etc via nova config file, that would be across all users. It should be possible for clients to specify and save their preferences. When not specified, these should default to strong, industry popular options. For example aes-xts-plain64 for volume encryption. aes-256-cbc for object encryption. The available options should be retrievable from a common openstack component. These settings should be attached to the client accounts with the most specific value used, for example if user has no specification, check any project specification, if none, then check for any domain specification, else use default. Specification URL (additional information): None