Secure Distributed File System : A HIGHLY simplified, secure distributed file system . ThisSecure Distributed File Service (SDFS) stores copies of files created by its users at remote client machines. The system consists of multiple SDFS clients and a server that stores files and handles requests from various clients . To secure communication between clients and the server, and authenticate sources of requests, we assume that certificates are available . Thus, this system sets up a CA (Certificate Authority) that generates certificat es for clients and the server. All nodes trust the CA and have its public key.