76 lines
1.6 KiB
Plaintext
76 lines
1.6 KiB
Plaintext
# Denning-Sacco shared key
|
|
#
|
|
# Modelled after the description in the SPORE library
|
|
# http://www.lsv.ens-cachan.fr/spore/denningSacco.html
|
|
#
|
|
# Note:
|
|
# This protocol uses a ticket so scyther will only be able to verify
|
|
# the protocol using the ARACHNE engine (-a)
|
|
#
|
|
|
|
usertype Key;
|
|
usertype SessionKey;
|
|
usertype TimeStamp;
|
|
secret k: Function;
|
|
const Fresh: Function;
|
|
|
|
protocol denningSacco(I,R,S)
|
|
{
|
|
role I
|
|
{
|
|
var W: Ticket;
|
|
var Kir: SessionKey;
|
|
var T: TimeStamp;
|
|
|
|
send_1(I,S, I,R );
|
|
read_2(S,I, {R, Kir, T, W}k(I,S) );
|
|
send_3(I,R, W);
|
|
claim_I1(I,Niagree);
|
|
claim_I2(I,Nisynch);
|
|
claim_I3(I,Secret,Kir);
|
|
claim_I4(I,Empty, (Fresh,Kir));
|
|
}
|
|
|
|
role R
|
|
{
|
|
var Kir: SessionKey;
|
|
var T: TimeStamp;
|
|
|
|
read_3(I,R, {Kir,I,T}k(R,S));
|
|
claim_R1(R,Niagree);
|
|
claim_R2(R,Nisynch);
|
|
claim_R3(R,Secret,Kir);
|
|
claim_R4(R,Empty, (Fresh,Kir));
|
|
}
|
|
|
|
role S
|
|
{
|
|
var W: Ticket;
|
|
const Kir: SessionKey;
|
|
const T: TimeStamp;
|
|
|
|
read_1(I,S, I,R );
|
|
send_2(S,I, {R, Kir, T, {Kir, I,T}k(R,S)}k(I,S));
|
|
}
|
|
}
|
|
|
|
const Alice,Bob,Simon,Eve: Agent;
|
|
|
|
untrusted Eve;
|
|
const kee: SessionKey;
|
|
const tee: TimeStamp;
|
|
compromised k(Eve,Simon);
|
|
|
|
|
|
|
|
# General scenario, 2 parallel runs of the protocol
|
|
# Note because the modelchecker does not support tickets this might not
|
|
# be very useful
|
|
|
|
run denningSacco.I(Agent,Agent,Simon);
|
|
run denningSacco.R(Agent,Agent,Simon);
|
|
run denningSacco.S(Agent,Agent,Simon);
|
|
run denningSacco.I(Agent,Agent,Simon);
|
|
run denningSacco.R(Agent,Agent,Simon);
|
|
run denningSacco.S(Agent,Agent,Simon);
|