1. Author(s) Politehnica University of Bucharest Automatic Control and Computers Faculty Computer Science Department SSH-Based Efficient File Synchronization Mihai Neagu mihai.neagu@cti.pub.ro Bachelor Presentation Session - July 2011

2. Content Introduction Architecture Tools Employed Implementation Conclusions Questions 05.12.20152 Bachelor Presentation Session - July 2011

3. Introduction Dropbox (closed source, centralized) Unison (no longer supported, transfer limitations) Develop an open source alternative 05.12.2015Bachelor Presentation Session - July 20103

4. Introduction Contacted csync developers Invited to collaborate on an open source project New goal: define an architecture Design a prototype => Java 05.12.20154 Bachelor Presentation Session - July 2011

5. Architecture 05.12.20155 Bachelor Presentation Session - July 2011

6. Tools Employed Ganymed SSH-2 for Java Jarsync Jnotify JUnit Tests 05.12.20156 Bachelor Presentation Session - July 2011

7. Implementation Test-Driven Development 05.12.20157 Bachelor Presentation Session - July 2011

8. Implementation Change Detection Alteration Storage Delta Encoding Authentication SSH Exception Management User Rights Conflict Management Time Zone Filenames on different OS 05.12.20158 Bachelor Presentation Session - July 2011

9. Implementation 05.12.20159 Bachelor Presentation Session - July 2011

10. Delta Encoding 05.12.201510 Bachelor Presentation Session - July 2011

11. Conclusions Developed a prototype which includes:  Remote synchronization through push and pull operations on an SSH server  Tests for all the important modules Gained experience collaborating on an open source project Room for improvements to be made 05.12.201511 Bachelor Presentation Session - July 2011

12. Questions Synchronization SSH Delta Encoding inotify 05.12.201512 Bachelor Presentation Session - July 2011