Lecture 13 Many-time Signatures 1 One-time Signatures
نویسندگان
چکیده
Constructing a scheme that satisfies such a strong security notion is very involved, so we start with an easier goal: unforgeability under a one-time chosen-message attack (uf-1cma). The definition is syntactically identical to the one above, but F is restricted to make (at most) one query to its signing oracle. Here we describe Lamport’s one-time signature scheme OTS for messages of length ` = poly(n), which is based on a one-way function f :
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