scyther/spdl/misc/gong-nonce-b.spdl
2006-11-21 13:40:50 +00:00

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usertype Sessionkey;
usertype Keypart;
secret k: Function;
const f: Function;
/*
* Gong nonce based alternative
*
* Boyd & Mathuria: Protocols for authentication and key establishment
* (2003) p. 101
*/
protocol gongnonceb(I,R,S)
{
role I
{
const ni: Nonce;
var nr: Nonce;
const ki: Keypart;
var kr: Keypart;
send_1 (I,S, I,R, { I,S,I, ki, R }k(I,S), ni );
read_4 (S,I, { S,I,R,kr,I }k(I,S), { R,I,ni }f(ki,kr), nr );
send_5 (I,R, { I,R,nr }f(ki,kr) );
claim_6 (I, Secret, ki);
claim_7 (I, Secret, kr);
claim_8 (I, Nisynch);
claim_9 (I, Niagree);
}
role R
{
var ni: Nonce;
const nr: Nonce;
const kr: Keypart;
var ki: Keypart;
read_2 (S,R, I,R, { S,R,I, ki, R }k(R,S), ni );
send_3 (R,S, { R,S,R,kr,I }k(R,S), { R,I, ni }f(ki,kr), nr );
read_5 (I,R, { I,R,nr }f(ki,kr) );
claim_10 (R, Secret, ki);
claim_11 (R, Secret, kr);
claim_12 (R, Nisynch);
claim_13 (R, Niagree);
}
role S
{
var ni,nr: Nonce;
var ki,kr: Keypart;
var T;
read_1 (I,S, I,R, { I,S,I, ki, R }k(I,S), ni );
send_2 (S,R, I,R, { S,R,I, ki, R }k(R,S), ni );
read_3 (R,S, { R,S,R,kr,I }k(R,S), T, nr );
send_4 (S,I, { S,I,R,kr,I }k(I,S), T, nr );
}
}
const Alice,Bob,Simon,Eve: Agent;
untrusted Eve;
const ne: Nonce;
const kpe: Keypart;
const ke: Sessionkey;
compromised k(Eve,Eve);
compromised k(Eve,Alice);
compromised k(Eve,Bob);
compromised k(Eve,Simon);
compromised k(Alice,Eve);
compromised k(Bob,Eve);
compromised k(Simon,Eve);
run gongnonceb.I(Agent,Agent,Simon);
run gongnonceb.R(Agent,Agent,Simon);
run gongnonceb.S(Agent,Agent,Simon);
run gongnonceb.I(Agent,Agent,Simon);
run gongnonceb.R(Agent,Agent,Simon);
run gongnonceb.S(Agent,Agent,Simon);