37 lines
499 B
Plaintext
37 lines
499 B
Plaintext
|
/*
|
||
|
|
Samasc broken
|
||
|
|
*/
|
||
|
|
|
||
|
|
usertype Key;
|
||
|
|
|
||
|
|
const pk: Function;
|
||
|
|
secret sk: Function;
|
||
|
|
|
||
|
|
inversekeys (pk,sk);
|
||
|
|
|
||
|
|
protocol samascbroken(I,R)
|
||
|
|
{
|
||
|
|
role R
|
||
|
|
{
|
||
|
|
const nr: Nonce;
|
||
|
|
var kir: Key;
|
||
|
|
|
||
|
|
read_1a (I,R, { kir,I }pk(R) );
|
||
|
|
send_1b (R,I, {nr,R}pk(I) );
|
||
|
|
|
||
|
|
/* Commenting out these two lines yields an attack: */
|
||
|
|
read_2a (I,R, { nr }kir );
|
||
|
|
send_2b (R,I, { I,R,nr }kir );
|
||
|
|
|
||
|
|
read_3 (I,R, { I,R }kir );
|
||
|
|
|
||
|
|
claim_4 (R, Secret, kir );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const a,b,e: Agent;
|
||
|
|
|
||
|
|
untrusted e;
|
||
|
|
compromised sk(e);
|
||
|
|
const ne: Nonce;
|