84 lines
1.8 KiB
Plaintext
84 lines
1.8 KiB
Plaintext
# Denning-Sacco shared key
|
|
#
|
|
# Modelled after the description in the SPORE library
|
|
# http://www.lsv.ens-cachan.fr/spore/denningSacco.html
|
|
#
|
|
|
|
usertype Key;
|
|
usertype SessionKey;
|
|
usertype TimeStamp;
|
|
usertype ExpiredTimeStamp;
|
|
secret k: Function;
|
|
const Fresh: Function;
|
|
const Compromised: Function;
|
|
|
|
protocol denningSacco^KeyCompromise(C)
|
|
{
|
|
// Read the names of 3 agents and disclose a session between them including
|
|
// corresponding session key to simulate key compromise
|
|
role C {
|
|
const Ni,Nr: Nonce;
|
|
const Kir: SessionKey;
|
|
const T: ExpiredTimeStamp;
|
|
var I,R,S: Agent;
|
|
|
|
read_C1(C,C, I,R,S);
|
|
send_C2(C,C, (I,R),
|
|
{R,Kir,T,{Kir,I,T}k(R,S)}k(I,S),
|
|
{Kir,I,T}k(R,S),
|
|
Kir
|
|
);
|
|
claim_C3(C,Empty, (Compromised,Kir));
|
|
}
|
|
}
|
|
|
|
protocol denningSacco(I,R,S)
|
|
{
|
|
role I
|
|
{
|
|
var W: Ticket;
|
|
var Kir: SessionKey;
|
|
var T: TimeStamp;
|
|
|
|
send_1(I,S, I,R );
|
|
read_2(S,I, {R, Kir, T, W}k(I,S) );
|
|
send_3(I,R, W);
|
|
claim_I1(I,Niagree);
|
|
claim_I2(I,Nisynch);
|
|
claim_I3(I,Secret,Kir);
|
|
claim_I4(I,Empty, (Fresh,Kir));
|
|
}
|
|
|
|
role R
|
|
{
|
|
var Kir: SessionKey;
|
|
var T: TimeStamp;
|
|
|
|
read_3(I,R, {Kir,I,T}k(R,S));
|
|
claim_R1(R,Niagree);
|
|
claim_R2(R,Nisynch);
|
|
claim_R3(R,Secret,Kir);
|
|
claim_R4(R,Empty, (Fresh,Kir));
|
|
}
|
|
|
|
role S
|
|
{
|
|
var W: Ticket;
|
|
const Kir: SessionKey;
|
|
const T: TimeStamp;
|
|
|
|
read_1(I,S, I,R );
|
|
send_2(S,I, {R, Kir, T, {Kir, I,T}k(R,S)}k(I,S));
|
|
}
|
|
}
|
|
|
|
const Alice,Bob,Simon,Eve: Agent;
|
|
|
|
untrusted Eve;
|
|
const kee: SessionKey;
|
|
const tee: TimeStamp;
|
|
compromised k(Eve,Simon);
|
|
|
|
|
|
|