This popped up on DelphiFeeds.com today http://delphi.about.com/od/objectpascalide/a/delphi-md5-hash.htm
Alister Christie Computers for People Ph: 04 471 1849 Fax: 04 471 1266 http://www.salespartner.co.nz PO Box 13085 Johnsonville Wellington John Bird wrote: > I wish to send a data file either as an email attachment or via FTP and wish > to be able to ensure: > > 1 - it is not altered in transport. > > 2 - It came from where it is supposed to have come from. > > Its a new area for me - what I have figured out so far is to say generate a > hash for the file - using say SHA1 or SHA2 and append that on the file as a > check. Or to be even cleverer for the second part do the sort of trick when > passwords are sent over a network with generating a unique session string > (which never leaves the server), and hash the combination of both. file and > session string This gives something that can be checked back to the server > when the file arrives - ie no-one else could generate the same hash. > > Can anyone suggest any web sites to read up more on - or give ideas on how > they would do this? > > Best hashes to use? > > If SHA hashes are the way to go, anyone know of Delphi implementations? > > John > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: delphi@delphi.org.nz > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: > unsubscribe > > _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: delphi@delphi.org.nz Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: unsubscribe
