scyther/testing/ns3.spdl

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/*
* Needham-Schroeder protocol
*/
// PKI infrastructure
const pk: Function;
secret sk: Function;
inversekeys (pk,sk);
// The protocol description
protocol ns3(I,R)
{
role I
{
fresh ni: Nonce;
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var nr: Nonce;
send_1(I,R, {I,ni}pk(R) );
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recv_2(R,I, {ni,nr}pk(I) );
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send_3(I,R, {nr}pk(R) );
claim_i1(I,Secret,ni);
claim_i2(I,Secret,nr);
claim_i3(I,Niagree);
claim_i4(I,Nisynch);
}
role R
{
var ni: Nonce;
fresh nr: Nonce;
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recv_1(I,R, {I,ni}pk(R) );
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send_2(R,I, {ni,nr}pk(I) );
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recv_3(I,R, {nr}pk(R) );
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claim_r1(R,Secret,ni);
claim_r2(R,Secret,nr);
claim_r3(R,Niagree);
claim_r4(R,Nisynch);
}
}
// The agents in the system
// An untrusted agent, with leaked information
// The runs (only needed for the modelchecker algorithm)