3.1 BackupKey Remote Server Details

A server implementation of the BackupKey Remote Protocol MUST fully support at least one of its two subprotocols, as specified in section 3.1.4.1. Server implementations SHOULD fully support both subprotocols. If a server supports the wrapping operation of a subprotocol, it MUST also support the unwrapping operation of that subprotocol. A server MAY support the unwrapping operation of a subprotocol even if it does not support the wrapping operation.<5>