45 lines
971 B
Plaintext
45 lines
971 B
Plaintext
|
# CCITT X.509 (1c)
|
||
|
|
#
|
||
|
|
# Modelled after the description in the SPORE library
|
||
|
|
# http://www.lsv.ens-cachan.fr/spore/ccittx509_1c.html
|
||
|
|
#
|
||
|
|
# Note:
|
||
|
|
# According to SPORE there are no known attacks on this protocol
|
||
|
|
#
|
||
|
|
|
||
|
|
const pk,hash: Function;
|
||
|
|
secret sk,unhash: Function;
|
||
|
|
inversekeys (hash,unhash);
|
||
|
|
inversekeys(pk,sk);
|
||
|
|
usertype Timestamp;
|
||
|
|
|
||
|
|
protocol ccitt509-1c(I,R)
|
||
|
|
{
|
||
|
|
role I
|
||
|
|
{
|
||
|
|
const Ta: Timestamp;
|
||
|
|
const Na,Xa,Ya: Nonce;
|
||
|
|
send_1(I,R, I,{Ta, Na, R, Xa,{Ya,{hash(Ya)}sk(I)}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,{hash(Ya)}sk(I)}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);
|
||
|
|
|