scyther/gui/Protocols/otwayrees.spdl

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2006-11-21 13:42:06 +00:00
# Otway Rees
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/otwayRees.html
#
secret const k : Function;
const Fresh: Function;
const Compromised: Function;
usertype String,SessionKey;
protocol otwayRees^KeyCompromise(C)
{
// Read the names of 3 agents and disclose a session between them including
// corresponding session key to simulate key compromise
role C {
const Ni,Nr: Nonce;
const M: String;
const Kir: SessionKey;
var I,R,S: Agent;
read_!C1(C,C, I,R,S);
send_!C2(C,C, M,I,R,{Ni,M,I,R}k(I,S),
2006-11-21 13:42:06 +00:00
{Nr,M,I,R}k(R,S),
{Ni,Kir}k(I,S), {Nr,Kir}k(R,S),
Kir
);
claim_C3(C,Empty, (Compromised,Kir));
}
}
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);
claim_I3(I, Empty, (Fresh,Kir));
}
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);
claim_R3(R, Empty, (Fresh,Kir));
}
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);