https://github.com/EasyCrypt/easycrypt
Tip revision: 8bceccd0cf22999f88e5e30e1269c6153b519729 authored by Cécile BARITEL-RUET on 13 December 2017, 16:30:02 UTC
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Tip revision: 8bceccd
CPA.eca
(* --------------------------------------------------------------------
* Copyright (c) - 2012--2016 - IMDEA Software Institute
* Copyright (c) - 2012--2017 - Inria
*
* Distributed under the terms of the CeCILL-B-V1 license
* -------------------------------------------------------------------- *)
require import Bool Core.
require (*--*) DBool NewSKE.
clone include NewSKE.
module type CPA = {
proc enc(p: plain): cipher option
}.
module type Adv_CPA (O : CPA) = {
proc choose(): plain * plain
proc guess(c: cipher): bool
}.
module IND_CPA ( S : SKE, A : Adv_CPA) = {
module O = Wrap(S)
module A = A(O)
proc main(): bool = {
var b, b', c, p0, p1, p;
O.init();
(p0,p1) = A.choose();
b = ${0,1};
p = b ? p1 : p0; (* FIXME: need to check whether plaintexts are both valid or both invalid *)
c = O.enc(p);
b' = A.guess(oget c);
return b = b';
}
}.