scyther/gui/nsl3-broken.spdl
2006-12-13 13:08:33 +00:00

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/*
* Needham-Schroeder-Lowe protocol,
* broken version (wrong role name in first message)
*/
// PKI infrastructure
const pk: Function;
secret sk: Function;
inversekeys (pk,sk);
// The protocol description
protocol nsl3-broken(I,R)
{
role I
{
const ni: Nonce;
var nr: Nonce;
send_1(I,R, {R,ni}pk(R) );
read_2(R,I, {ni,nr,R}pk(I) );
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;
const nr: Nonce;
read_1(I,R, {R,ni}pk(R) );
send_2(R,I, {ni,nr,R}pk(I) );
read_3(I,R, {nr}pk(R) );
claim_r1(R,Secret,ni);
claim_r2(R,Secret,nr);
claim_r3(R,Niagree);
claim_r4(R,Nisynch);
}
}
// An untrusted agent, with leaked information
const Eve: Agent;
untrusted Eve;
compromised sk(Eve);