From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Salomon To: 9fans@cse.psu.edu Message-Id: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Subject: [9fans] compare-by-hash Date: Thu, 31 Jul 2003 13:24:33 -0400 Topicbox-Message-UUID: 0cf9990e-eacc-11e9-9e20-41e7f4b1d025 This is a bit late, but... A 160-bit hash (assuming "strong" hashing) has a 50% probabilty of collisions after 2^80 entries. Google "birthday paradox" for the math. --Joel