50 lines
1.1 KiB
Plaintext
50 lines
1.1 KiB
Plaintext
|
# BAN modified version of CCITT X.509 (3)
|
||
|
|
#
|
||
|
|
# Modelled after the description in the SPORE library
|
||
|
|
# http://www.lsv.ens-cachan.fr/spore/ccittx509_3BAN.html
|
||
|
|
#
|
||
|
|
# Note:
|
||
|
|
# The protocol description also states that Xa and Ya should be fresh
|
||
|
|
# this can not be verified using scyther
|
||
|
|
#
|
||
|
|
# Note:
|
||
|
|
# According to SPORE there are no known attacks on this protocol
|
||
|
|
#
|
||
|
|
|
||
|
|
const pk: Function;
|
||
|
|
secret sk: Function;
|
||
|
|
inversekeys(pk,sk);
|
||
|
|
|
||
|
|
protocol ccitt509-ban3(I,R)
|
||
|
|
{
|
||
|
|
role I
|
||
|
|
{
|
||
|
|
const Na,Xa,Ya: Nonce;
|
||
|
|
var Xb,Nb,Yb: Nonce;
|
||
|
|
|
||
|
|
send_1(I,R, I,{Na, R, Xa,{Ya}pk(R)}sk(I));
|
||
|
|
read_2(R,I, R,{Nb, I, Na, Xb,{Yb}pk(I)}sk(R));
|
||
|
|
send_3(I,R, I,{R, Nb}sk(I));
|
||
|
|
claim_4(I,Nisynch);
|
||
|
|
}
|
||
|
|
|
||
|
|
role R
|
||
|
|
{
|
||
|
|
var Na,Xa,Ya: Nonce;
|
||
|
|
const Xb,Yb,Nb: Nonce;
|
||
|
|
|
||
|
|
read_1(I,R, I,{Na, R, Xa,{Ya}pk(R)}sk(I));
|
||
|
|
send_2(R,I, R,{Nb, I, Na, Xb,{Yb}pk(I)}sk(R));
|
||
|
|
read_3(I,R, I,{R, Nb}sk(I));
|
||
|
|
claim_5(R,Nisynch);
|
||
|
|
# There should also be Fresh Xa and Fresh Ya claims here
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const Alice,Bob,Eve: Agent;
|
||
|
|
|
||
|
|
untrusted Eve;
|
||
|
|
const ne: Nonce;
|
||
|
|
compromised sk(Eve);
|
||
|
|
|