Version 1.1 (November 2017)
    - Fix a bug of upload and download in Version 1.1.
    - Fix a bug of key management in Version 1.1.
    - Change upload and download interfaces in Version 1.1.
    - Include keygen and rekeying interfaces.
    - Create client.conf for easy configuration.
    - Include protection of stubs.
    - Include SSL communications.
    - Include key regression for policy update.
    - Include similarity-based key generation. 

Version 1.0 (April 2016)
    - First release