scyther/gui/Protocols/kaochow-v3.spdl

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# Kao Chow Authentication v.3
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/kaoChow3.html
#
usertype SessionKey;
usertype ExpiredTimeStamp;
usertype TimeStamp;
secret k: Function;
const Fresh: Function;
const Compromised: Function;
protocol kaochow-3(I,R,S)
{
role I
{
const ni: Nonce;
var nr: Nonce;
var kir,kt: SessionKey;
var T2: Ticket;
send_1 (I,S, I,R,ni);
read_3 (R,I, {I,R,ni,kir,kt}k(I,S), {ni, kir}kt, nr, T2 );
send_4 (I,R, {nr,kir}kt, T2 );
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,kt: SessionKey;
var T: Ticket;
const tr: TimeStamp;
read_2 (S,R, T, { I,R,ni,kir,kt }k(R,S) );
send_3 (R,I, T, {ni, kir}kt, nr, {I,R,tr,kir}k(R,S) );
read_4 (I,R, {nr,kir}kt, {I,R,tr,kir}k(R,S) );
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, kt: SessionKey;
read_1 (I,S, I,R,ni);
send_2 (S,R, {I,R,ni,kir,kt}k(I,S), { I,R,ni,kir,kt }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);