scyther/spdl/SPORE/otwayrees.spdl

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# Otway Rees
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/otwayRees.html
#
#
# Note:
# This protocol uses a ticket so scyther will only be able to verify
# the protocol using the ARACHNE engine (-a) and type 2 matching (-m2)
#
secret const k : Function;
usertype String,SessionKey,Ticket;
protocol otwayrees(I,R,S)
{
role I
{
const Ni : Nonce;
const M : String;
var Kir : SessionKey;
send_1(I,R, M,I,R,{Ni,M,I,R}k(I,S) );
read_4(R,I, M,{Ni,Kir}k(I,S) );
claim_I1(I, Secret,Kir);
#claim_I2(I, Nisynch);
}
role R
{
var M : String;
const Nr : Nonce;
var Kir : SessionKey;
var T1,T2: Ticket;
read_1(I,R, M,I,R, T1 );
send_2(R,S, M,I,R, T1, { Nr,M,I,R }k(R,S) );
read_3(S,R, M, T2, { Nr,Kir }k(R,S) );
send_4(R,I, M, T2 );
claim_R1(R, Secret,Kir);
#claim_R2(R, Nisynch);
}
role S
{
var Ni,Nr : Nonce;
var M : String;
const Kir : SessionKey;
read_2(R,S, M,I,R, { Ni,M,I,R}k(I,S), { Nr,M,I,R }k(R,S) );
send_3(S,R, M, { Ni,Kir }k(I,S) , { Nr,Kir }k(R,S) );
}
}
const Alice, Bob, Eve, Simon: Agent;
untrusted Eve;
compromised k(Eve,Simon);
run otwayrees.A(Alice, Agent, Simon);
run otwayrees.B(Agent, Bob, Simon);
run otwayrees.S(Agent, Agent, Simon);
run otwayrees.A(Agent, Agent, Simon);
run otwayrees.B(Agent, Agent, Simon);
run otwayrees.S(Agent, Agent, Simon);