Return-Path: william@bourbon.usc.edu Delivery-Date: Sat Apr 21 20:41:29 2007 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on merlot.usc.edu X-Spam-Level: X-Spam-Status: No, score=-3.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00, NO_REAL_NAME autolearn=ham version=3.1.3 Received: from bourbon.usc.edu (bourbon.usc.edu [128.125.9.75]) by merlot.usc.edu (8.13.5/8.13.5) with ESMTP id l3M3fTBV015729 for ; Sat, 21 Apr 2007 20:41:29 -0700 Received: from bourbon.usc.edu (localhost.localdomain [127.0.0.1]) by bourbon.usc.edu (8.13.5/8.13.5) with ESMTP id l3M3fG9O002942 for ; Sat, 21 Apr 2007 20:41:16 -0700 Message-Id: <200704220341.l3M3fG9O002942@bourbon.usc.edu> To: cs551@merlot.usc.edu Subject: Re: Question on DELETE Date: Sat, 21 Apr 2007 20:41:16 -0700 From: william@bourbon.usc.edu Someone wrote: > Since only the user who created a file using store can delete it > from the network. So a user who GOT a file cant delete it even > from his node's permanent storage, right? and its not being asked > for in this assignment? If this user has write privilege in HomeDir, he/she can delete the file from the file system by doing "rm" and there is no way to prevent this user from doing this. Is that what you were asking? The only way specified in the assignment to delete a file is via the DELETE message and your node should verify digital signature before deleting a file. -- Bill Cheng // bill.cheng@usc.edu ----- Original Message ----- From: william@bourbon.usc.edu Date: Friday, April 13, 2007 3:19 pm Subject: Re: Question on DELETE To: cs551@merlot.usc.edu > Someone wrote: > > > Say two nodes have the same copy of a file (filename, nonce, and > > sha1), and one of them try to 'delete'. It first tries to > delete the local > > copy, however the signature verification fails. Should it stop > or continue > > flooding out Delete to other nodes? > > Yes. I guess it's possible that the local copy is somehow corrupted. > -- > Bill Cheng // bill.cheng@usc.edu >