Types of signatures Arbitrated digital signature - involves a trusted third party or arbiter v Every signed message from sender. X, to receiver, Y, goes to an arbiter, A, first v A subjects message signature to number of tests to check origin content v a dates the message and sends it to y with indication that it has been verified to its satisfaction8 Types of Signatures • Arbitrated digital signature – involves a trusted third party or arbiter ✓Every signed message from sender, X, to receiver, Y, goes to an arbiter, A, first. ✓A subjects message + signature to number of tests to check origin & content ✓A dates the message and sends it to Y with indication that it has been verified to its satisfaction