scyther/gui/Protocols/splice-as-cj.spdl

# Clark and Jacob modified Hwang and Chen modified SPLICE/AS
#
# Modelled after the description in the SPORE library
# http://www.lsv.ens-cachan.fr/spore/spliceas3.html
#
# Note:
# The assumptions made here do not comply with those in SPORE 
# SPORE assumes that the agents do not know the pk function, but only
# their own public key values. 
# This can currently not be modelled.


usertype TimeStamp, LifeTime;

const inc,dec: Function;
inversekeys (inc,dec);

protocol spliceAS-CJ(I,R,S)
{
        role I
    {
        fresh N1,N2: Nonce;
        fresh T: TimeStamp;
        fresh L: LifeTime;

        send_1(I,S,  I, R, N1 );
        read_2(S,I,  S, {S, I, N1, R, pk(R)}sk(S) );
        send_3(I,R,  I, R, {T, L, {I, N2}pk(R)}sk(I) );
        read_6(R,I,  R, I, {{N2}inc}pk(I) );

        claim_7(I, Secret, N2);
        claim_9(I, Niagree);
        claim_10(I, Nisynch);
    }

    role S
    {
        var N1,N3: Nonce;

        read_1(I,S,  I, R, N1 );
        send_2(S,I,  S, {S, I, N1, R, pk(R)}sk(S) );
        read_4(R,S, R, I, N3 );
        send_5(S,R,  S, {S, R, N3, pk(I)}sk(S) );
    }

    role R
    {
        fresh N3: Nonce;
        var N2: Nonce;
        var T: TimeStamp;
        var L: LifeTime;

        var ni: Nonce;
        fresh nr: Nonce;

        read_3(I,R, I, R, {T, L, {I, N2}pk(R)}sk(I) );
        send_4(R,S, R, I, N3 );
        read_5(S,R, S, {S, R, N3, pk(I)}sk(S) );
        send_6(R,I, R, I, {{N2}inc}pk(I) );

        claim_8(R, Secret, N2);
        claim_11(R, Niagree);
        claim_12(R, Nisynch);
    }
}