scyther/gui/Protocols/woo-lam-pi.spdl

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# Woo and Lam Pi
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/wooLamPi.html
#
# Note:
# Scyther finds an attack that appears to be legit, but is not present in
# SPORE.
#
protocol woolamPi(I,R,S)
{
role I
{
var Nr: Nonce;
send_1(I,R, I);
read_2(R,I, Nr);
send_3(I,R, {Nr}k(I,S));
}
role R
{
fresh Nr: Nonce;
var T: Ticket;
read_1(I,R, I);
send_2(R,I, Nr);
read_3(I,R, T);
send_4(R,S, {I, T}k(R,S));
read_5(S,R, {Nr}k(R,S));
claim_R1(R,Nisynch);
}
role S
{
var Nr: Nonce;
read_4(R,S, {I,{Nr}k(I,S)}k(R,S));
send_5(S,R, {Nr}k(R,S));
}
}