100 lines
2.2 KiB
Plaintext
100 lines
2.2 KiB
Plaintext
# Lowe modified Wide Mouthed Frog
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#
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# Modelled after the description in the SPORE library
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# http://www.lsv.ens-cachan.fr/spore/wideMouthedFrogLowe.html
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#
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# Note:
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# According to SPORE there are no known attacks on this protocol, scyther
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# finds one however this has to do with the unusual assumption that every
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# agent can recognise and will reject to read messages that it has created
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# itself.
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usertype SessionKey;
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usertype TimeStamp;
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const succ,pred: Function;
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inversekeys (succ,pred);
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const Fresh: Function;
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const Compromised: Function;
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secret k: Function;
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protocol wmfLoweSessionKeyCompromise(C)
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{
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// Read the names of 3 agents and disclose a session between them including
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// corresponding session key to simulate key compromise
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role C {
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const Ni,Nr: Nonce;
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const Kir: SessionKey;
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const Ti,Ts: TimeStamp;
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var I,R,S: Agent;
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read_C1(C,C, I,R,S);
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send_C2(C,C, I, {Ti,R,Kir}k(I,S),
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{Ts,I,Kir}k(R,S),
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{Nr}k(I,S),
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{{Nr}succ}k(I,S),
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Kir
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);
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claim_C3(C,Empty, (Compromised,Kir));
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}
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}
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protocol wmfLowe(I,R,S)
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{
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role I
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{
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const Kir: SessionKey;
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const Ti: TimeStamp;
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var Kr: SessionKey;
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var Nr: Nonce;
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send_1(I,S, I, {Ti, R, Kir}k(I,S));
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read_3(R,I,{Nr}Kir);
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send_4(I,R,{{Nr}succ}Kir);
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claim_I1(I,Secret,Kir);
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claim_I2(I,Nisynch);
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claim_I3(I,Empty,(Fresh,Kir));
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}
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role R
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{
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var Ts: TimeStamp;
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var Kir: SessionKey;
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const Nr: Nonce;
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read_2(S,R, {Ts, I, Kir}k(R,S) );
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send_3(R,I, {Nr}Kir);
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read_4(I,R, {{Nr}succ}Kir);
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claim_R1(R,Secret,Kir);
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claim_R2(R,Nisynch);
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claim_R3(R,Empty,(Fresh,Kir));
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}
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role S
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{
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var Kir: SessionKey;
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const Ts: TimeStamp;
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var Ti: TimeStamp;
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read_1(I,S, I,{Ti, R, Kir}k(I,S) );
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send_2(S,R, {Ts, I, Kir}k(R,S));
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}
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}
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const Alice,Bob,Eve,Simon: Agent;
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const Ke: SessionKey;
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const Te: TimeStamp;
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untrusted Eve;
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compromised k(Eve,Simon);
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run wmfLowe.I (Agent,Agent,Simon);
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run wmfLowe.R (Agent,Agent,Simon);
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run wmfLowe.S (Agent,Agent,Simon);
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