scyther/gui/Protocols/ccitt509-3.spdl
2007-05-19 17:10:46 +02:00

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# CCITT X.509 (3)
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/ccittx509_3.html
#
# Note:
# The protocol description also states that Xa and Ya should be fresh
# this can not be verified using scyther
#
const pk: Function;
secret sk: Function;
inversekeys(pk,sk);
usertype Timestamp;
protocol ccitt509-3(I,R)
{
role I
{
const Ta: Timestamp;
var Tb: Timestamp;
const Na,Xa,Ya: Nonce;
var Xb,Nb,Yb: Nonce;
send_1(I,R, I,{Ta, Na, R, Xa,{Ya}pk(R)}sk(I));
read_2(R,I, R,{Tb, Nb, I, Na, Xb,{Yb}pk(I)}sk(R));
send_3(I,R, I, {Nb}sk(I));
claim_I1(I,Nisynch);
claim_I2(I,Secret,Ya);
claim_I3(I,Secret,Yb);
}
role R
{
var Ta: Timestamp;
const Tb: Timestamp;
var Na,Xa,Ya: Nonce;
const Xb,Yb,Nb: Nonce;
read_1(I,R, I,{Ta, Na, R, Xa,{Ya}pk(R)}sk(I));
send_2(R,I, R,{Tb, Nb, I, Na, Xb,{Yb}pk(I)}sk(R));
read_3(I,R, I, {Nb}sk(I));
claim_R1(R,Nisynch);
claim_R2(R,Secret,Ya);
claim_R3(R,Secret,Yb);
# There should also be Fresh Xa and Fresh Ya claims here
}
}
const Alice,Bob,Eve: Agent;
untrusted Eve;
const ne: Nonce;
const te: Timestamp;
compromised sk(Eve);