scyther/gui/Protocols/andrew-ban.spdl

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# BAN modified Andrew Secure RPC
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/andrewBAN.html
#
# Note:
# The shared key between I and R is modelled as k(I,R) currently
# there is no way to express that this key is equal to k(R,I)
# So it is possile that certain attacks that use this property are not found
#
# Note:
# According to SPORE there are no known attacks on this protocol
#
usertype SessionKey;
const Fresh: Function;
const Compromised: Function;
protocol andrew-Ban(I,R)
{
role I
{
fresh ni: Nonce;
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var nr,nr2: Nonce;
var kir: SessionKey;
send_1(I,R, I,{ni}k(I,R) );
read_2(R,I, {ni,nr}k(I,R) );
send_3(I,R, {nr}k(I,R) );
read_4(R,I, {kir,nr2,ni}k(I,R) );
claim_I1(I,Nisynch);
claim_I2(I,Niagree);
claim_I3(I,Secret, kir);
claim_I4(I,Secret, k(I,R));
claim_I5(I,Empty, (Fresh,kir));
}
role R
{
var ni: Nonce;
fresh nr,nr2: Nonce;
fresh kir: SessionKey;
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read_1(I,R, I,{ni}k(I,R) );
send_2(R,I, {ni,nr}k(I,R) );
read_3(I,R, {nr}k(I,R) );
send_4(R,I, {kir,nr2,ni}k(I,R) );
claim_R1(R,Nisynch);
claim_R2(R,Niagree);
claim_R3(R,Secret, kir);
claim_R4(R,Secret, k(I,R));
claim_R5(R,Empty, (Fresh,kir));
}
}