61 lines
1.1 KiB
Plaintext
61 lines
1.1 KiB
Plaintext
usertype Sessionkey;
|
|
usertype Macseed;
|
|
const m: Function;
|
|
secret unm: Function;
|
|
const f: Function;
|
|
|
|
inversekeys (m, unm);
|
|
|
|
/*
|
|
* Boyd key agreement
|
|
*
|
|
* Boyd & Mathuria: Protocols for authentication and key establishment
|
|
* (2003) p. 101
|
|
*
|
|
* Note that MAC_ks(x) has been interpreted as MAC(x,ks); this
|
|
* assumption causes some possible false attacks.
|
|
*/
|
|
|
|
protocol boyd(I,R,S)
|
|
{
|
|
role I
|
|
{
|
|
fresh ni: Nonce;
|
|
var nr: Nonce;
|
|
var ks: Macseed;
|
|
|
|
send_1 (I,S, I,R, ni );
|
|
recv_3 (R,I, { I,R, ks }k(I,S), m(ni, m(ks,ni,nr)), nr );
|
|
send_4 (I,R, m(nr, m(ks,ni,nr)) );
|
|
|
|
claim_6 (I, Secret, m(ks,ni,nr) );
|
|
claim_7 (I, Niagree);
|
|
claim_8 (I, Nisynch);
|
|
}
|
|
|
|
role R
|
|
{
|
|
var ni: Nonce;
|
|
fresh nr: Nonce;
|
|
var ks: Macseed;
|
|
|
|
recv_2 (S,R, { I,R, ks }k(I,S), { I,R, ks }k(R,S), ni );
|
|
send_3 (R,I, { I,R, ks }k(I,S), m(ni, m(ks,ni,nr)), nr );
|
|
recv_4 (I,R, m(nr, m(ks,ni,nr)) );
|
|
|
|
claim_10 (R, Secret, m(ks,ni,nr));
|
|
claim_11 (R, Niagree);
|
|
claim_12 (R, Nisynch);
|
|
}
|
|
|
|
role S
|
|
{
|
|
var ni,nr: Nonce;
|
|
fresh ks: Macseed;
|
|
|
|
recv_1 (I,S, I,R, ni );
|
|
send_2 (S,R, { I,R, ks }k(I,S), { I,R, ks }k(R,S), ni );
|
|
}
|
|
}
|
|
|