scyther/testing/ibe-ns.spdl

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// 12/05/06
// S. Mauw
// Using Identity Based Encryption primitive to make NSL authentication.
// The only requirement on the server communications is that the
// sending of the private key is secret.
const ibepublic: Function; //publicly known key construction from server
//parameters and recipient name
secret ibesecret: Function;//secret key determined by server for recipient
const param: Function; //public security parameter of server
inversekeys (ibepublic,ibesecret);
protocol ibe(I,R,S)
{
role I
{
fresh ni: Nonce;
var nr: Nonce;
//Note that we are not interested in the order of server messages.
recv_!1(S,I, param(S) );
send_3(I,R, {I,ni}ibepublic(param(S),R) );
recv_4(R,I, {ni,nr,R}ibepublic(param(S),I) );
send_5(I,R, {nr}ibepublic(param(S),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;
recv_!2(S,R, {ibesecret(param(S),R)}pk(R) );
recv_3(I,R, {I,ni}ibepublic(param(S),R) );
send_4(R,I, {ni,nr,R}ibepublic(param(S),I) );
recv_5(I,R, {nr}ibepublic(param(S),R) );
claim_r1(R,Secret,ni);
claim_r2(R,Secret,nr);
claim_r3(R,Niagree);
claim_r4(R,Nisynch);
}
role S
{
recv_!0(S,S, R,S); // workaround for the fact that R & S are roles, so Scyther should not jump to conclusions (remove it and see what happens)
send_!1(S,I, param(S) );
send_!2(S,R, {ibesecret(param(S),R)}pk(R) );
claim_s1(S,Secret,ibesecret(param(S),R));
}
}
compromised ibesecret(param(Eve),Alice);
compromised ibesecret(param(Eve),Bob);
compromised ibesecret(param(Eve),Carol);