0f54f2ed23
SPORE:
- pk is not known to all agents, only pk(Simon) is known
- Use new naming convention:
- Protocol name starting with an @ means internal protocol
- For non internal protocols naming is as follows:
protocolname-variant^subprotocol
For example: yahalom-Lowe^KeyCompromise meaning the key compromise sub
protocol of the Lowe variant of the Yahalom protocol.
96 lines
2.4 KiB
Plaintext
96 lines
2.4 KiB
Plaintext
# Lowe modified BAN concrete Andrew Secure RPC
|
|
#
|
|
# Modelled after the description in the SPORE library
|
|
# http://www.lsv.ens-cachan.fr/spore/andrewLowe.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:
|
|
# Read 4 by the Initatior has been placed after the synchronisation claim
|
|
# as it allows trivial synchronisation attacks otherwise (the message is
|
|
# completely fresh and can therefore always be replaced by an arbitrary value
|
|
# created by the intruder) which are not considered in SPORE
|
|
#
|
|
# Note:
|
|
# According to SPORE there are no known attacks on this protocol
|
|
#
|
|
|
|
usertype SessionKey;
|
|
secret k: Function;
|
|
const Fresh: Function;
|
|
const Compromised: Function;
|
|
|
|
protocol andrew-LoweBan^KeyCompromise(C)
|
|
{
|
|
// Read the names of 2 agents and disclose a session between them including
|
|
// corresponding session key to simulate key compromise
|
|
role C {
|
|
const ni,nr: Nonce;
|
|
const kir: SessionKey;
|
|
var I,R: Agent;
|
|
|
|
read_C1(C,C, I,R);
|
|
send_C2(C,C, (I,ni),
|
|
{ni,kir,R}k(I,R),
|
|
{ni}kir,
|
|
nr,
|
|
kir
|
|
);
|
|
claim_C3(C,Empty, (Compromised,kir));
|
|
}
|
|
}
|
|
|
|
protocol andrew-LoweBan(I,R)
|
|
{
|
|
role I
|
|
{
|
|
const ni: Nonce;
|
|
var nr: Nonce;
|
|
var kir: SessionKey;
|
|
|
|
send_1(I,R, I,ni );
|
|
read_2(R,I, {ni,kir,R}k(I,R) );
|
|
send_3(I,R, {ni}kir );
|
|
claim_I1(I,Nisynch);
|
|
claim_I2(I,Secret, kir);
|
|
claim_I3(I,Empty, (Fresh,kir));
|
|
read_4(R,I, nr );
|
|
}
|
|
|
|
role R
|
|
{
|
|
var ni: Nonce;
|
|
const nr: Nonce;
|
|
const kir: SessionKey;
|
|
|
|
read_1(I,R, I,ni );
|
|
send_2(R,I, {ni,kir,R}k(I,R) );
|
|
read_3(I,R, {ni}kir );
|
|
send_4(R,I, nr );
|
|
claim_R1(R,Nisynch);
|
|
claim_R2(R,Secret, kir);
|
|
claim_R3(R,Empty, (Fresh,kir));
|
|
}
|
|
}
|
|
|
|
const Alice,Bob,Eve: Agent;
|
|
|
|
untrusted Eve;
|
|
const ne: Nonce;
|
|
const kee: SessionKey;
|
|
compromised k(Eve,Eve);
|
|
compromised k(Eve,Alice);
|
|
compromised k(Eve,Bob);
|
|
compromised k(Alice,Eve);
|
|
compromised k(Bob,Eve);
|
|
|
|
|
|
|
|
run andrew-LoweBan.I(Agent,Agent);
|
|
run andrew-LoweBan.R(Agent,Agent);
|
|
run andrew-LoweBan.I(Agent,Agent);
|
|
run andrew-LoweBan.R(Agent,Agent);
|