scyther/spdl/SPORE/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
#
# Note:
# This protocol uses a ticket so scyther will only be able to verify
# the protocol using the ARACHNE engine (-a)
#
usertype Sessionkey;
usertype Timestamp;
secret k: Function;
protocol kaochow3(I,R,S)
{
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role I
{
const ni: Nonce;
var nr: Nonce;
var kir,kt: Sessionkey;
var T2: Ticket;
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send_1 (I,S, I,R,ni);
read_3 (R,I, R, {I,R,ni,kir,kt}k(I,S), {ni, kir}kt, nr, T2 );
send_4 (I,R, {nr,kir}kt, T2 );
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claim_5 (I, Nisynch);
claim_6 (I, Niagree);
claim_7 (I, Secret, kir);
}
role R
{
var ni: Nonce;
const nr: Nonce;
var kir,kt: Sessionkey;
var T: Ticket;
const tr: Timestamp;
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read_2 (S,R, T, { I,R,ni,kir,kt }k(R,S) );
send_3 (R,I, R, 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) );
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claim_8 (R, Nisynch);
claim_9 (R, Niagree);
claim_10 (R, Secret, kir);
}
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role S
{
var ni: Nonce;
const kir, kt: Sessionkey;
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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);
run kaochow3.I(Agent,Agent,Simon);
run kaochow3.R(Agent,Agent,Simon);
run kaochow3.S(Agent,Agent,Simon);
run kaochow3.I(Agent,Agent,Simon);
run kaochow3.R(Agent,Agent,Simon);
run kaochow3.S(Agent,Agent,Simon);