scyther/spdl/SPORE/ccitt509-1.spdl
2006-11-21 13:42:06 +00:00

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# CCITT X.509 (1)
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/ccittx509_1.html
#
# Note:
# The attack in SPORE is not found as this is not an attack against
# synchronisation, but an attack against the freshness of Xa and Ya
# which can currently not be modelled in scyther
#
const pk: Function;
secret sk: Function;
inversekeys(pk,sk);
usertype Timestamp;
protocol ccitt509-1(I,R)
{
role I
{
const Ta: Timestamp;
const Na,Xa,Ya: Nonce;
send_1(I,R, I,{Ta, Na, R, Xa,{Ya}pk(R)}sk(I));
# claim_2(I,Nisynch);
# This claim is useless as there are no preceding read events
}
role R
{
var Ta: Timestamp;
var Na,Xa,Ya: Nonce;
read_1(I,R, I,{Ta, Na, R, Xa,{Ya}pk(R)}sk(I));
claim_3(R,Nisynch);
# 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);