http://www.crazytrain.com/seizure.html
All is explained. Trevor Cushen Sysnet Ltd www.sysnet.ie Tel: +353 1 2983000 Fax: +353 1 2960499 -----Original Message----- From: H C [mailto:[EMAIL PROTECTED]] Sent: 19 February 2003 19:15 To: David J. Bianco Cc: Trevor Cushen; [EMAIL PROTECTED] Subject: RE: tools used to examine a computer David, I did say "hashes the file (MD5 and/or SHA-1)"...so do it both before and after you copy it over the network. Just be sure to collect the MAC times *before* you hash it, as hashing causes the file to be accessed, and the last access time changes. --- "David J. Bianco" <[EMAIL PROTECTED]> wrote: > On Tue, 2003-02-18 at 13:02, H C wrote: > > > Also on the point of copying files over the > network > > > first, correct me if > > > I'm wrong but that damages the chain of > evidence. > > > > Now so? If one collects the necessary info (ie, > MAC > > times, NTFS ADSs, permissions, full path, etc), > hashes > > the file (MD5 and/or SHA-1), and then copies the > file > > over the network using something like 'dd' or > type, > > and netcat/cryptcat, how is the chain of evidence > > broken? Especially if it's documented? > > Although Trevor has since posted a clarification to > the effect that > was referring to file copying as opposed to creating > a bit image with > dd, I think it's worth noting that in order to guard > against accidental > or malicious network data tampering, you'd have to > guarantee that the > data traversed the network without being tampered > with, probably by > computing an md5 sum on the data at both ends of the transfer. > Otherwise the chain of evidence would indeed be > broken, since most > networks are not guaranteed to be reliable or secure > from tampering. > > David > > > -- > David J. Bianco <[EMAIL PROTECTED]> > Thomas Jefferson National Accelerator Facility > __________________________________________________ Do you Yahoo!? Yahoo! Shopping - Send Flowers for Valentine's Day http://shopping.yahoo.com ************************************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this message in error please notify SYSNET Ltd., at telephone no: +353-1-2983000 or [EMAIL PROTECTED] **************************************************************************************
