Anonymous enscribed thusly:

Which is secure block cypher,or stream cypher? Thanks

Yes. In other words... It depends on things other than merely whether it's block cypher or stream cypher. Religious adherents on BOTH sides may differ (and prove the point). Mike -- Michael H. Warfield | (770) 985-6132 | mhw@WittsEnd.com (The Mad Wizard) | (770) 925-8248 | http://www.wittsend.com/mhw/ NIC whois: MHW9 | An optimist believes we live in the best of all PGP Key: 0xDF1DD471 | possible worlds. A pessimist is sure of it!