Comments on "An Oblivious Transfer Protocol and Its Application for The Exchange of Secrets"

Abstract

Rabin[1] has devised a protocol whereby use A transfer a secret to user B with probability. Thus user B has 50% chance of receiving the secret and a 50% chance of receiving nothing. On the other hand, user B will know whether he has received the secret；user A will not. Clearly, the uncertainty must be agreeable to both users. Called the “oblivious transfer (OT scheme)”.Harn and Lin [2] also proposed an OT scheme which is based on the discrete logaritthm problem. However, protocol errors was found in such scheme. This paper shows an attack to break the scheme.