scyther/protocols/SPORE/kaochow.spdl
2007-05-17 17:28:10 +02:00

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# Kao Chow Authentication v.1
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/kaoChow1.html
#
usertype SessionKey;
secret k: Function;
const Fresh: Function;
const Compromised: Function;
protocol kaochow^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 Kir: SessionKey;
var I,R,S: Agent;
read_!C1(C,C, I,R,S);
send_!C2(C,C, (I,R,Ni),
{I,R,Ni,Kir}k(I,S),
{I,R,Ni,Kir}k(R,S),
{Ni}Kir, Nr,
{Nr}Kir,
Kir
);
claim_C3(C,Empty, (Compromised,Kir));
}
}
protocol kaochow(I,R,S)
{
role I
{
const ni: Nonce;
var nr: Nonce;
var kir: SessionKey;
send_1 (I,S, I,R,ni);
read_3 (R,I, {I,R,ni,kir}k(I,S), {ni}kir, nr );
send_4 (I,R, {nr}kir );
claim_I1 (I, Nisynch);
claim_I2 (I, Niagree);
claim_I3 (I, Secret, kir);
claim_I4 (I, Empty, (Fresh,kir));
}
role R
{
var ni: Nonce;
const nr: Nonce;
var kir: SessionKey;
var T;
read_2 (S,R, T, { I,R,ni,kir }k(R,S) );
send_3 (R,I, T, {ni}kir, nr );
read_4 (I,R, {nr}kir );
claim_R1 (R, Nisynch);
claim_R2 (R, Niagree);
claim_R3 (R, Secret, kir);
claim_R4 (R, Empty, (Fresh,kir));
}
role S
{
var ni: Nonce;
const kir: SessionKey;
read_1 (I,S, I,R,ni);
send_2 (S,R, {I,R,ni,kir}k(I,S), { I,R,ni,kir }k(R,S) );
}
}
const Alice,Bob,Simon,Eve: Agent;
untrusted Eve;
const ne: Nonce;
const te: Ticket;
const ke: SessionKey;
compromised k(Eve,Eve);
compromised k(Eve,Alice);
compromised k(Eve,Bob);
compromised k(Eve,Simon);
compromised k(Alice,Eve);
compromised k(Bob,Eve);
compromised k(Simon,Eve);