scyther/protocols/misc/five-run-bound.spdl

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const pk: Function;
secret sk: Function;
inversekeys (pk,sk);
protocol r5bound(I,R)
{
role R
{
var k1: Nonce;
var ni: Nonce;
fresh k2: Nonce;
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recv_!1 (I,R, ni );
send_!2 (R,I, { ni }sk(R) );
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recv_!3 (I,R, {{{ {k1}pk(R) }sk(I)}sk(I)}sk(I) );
send_!4 (R,I, {k2}k1 );
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claim_6 (R, Secret, k2);
}
}