Data Flow Diagrams

A. Level 1 DFD:

B. Use Case Diagram:

C. Activity Diagram:

D. Sequence Diagram:

DescriptionUser ->user registration request than it itself checkfor existence of Use And than user login to systemauthentication is done and upload a file and dividethe data into data pieces and than searching the fileto which you want to access . lastly logout processis done.

D. Class Diagram: