author | wenzelm |
Wed, 14 Jun 2000 17:59:53 +0200 | |
changeset 9066 | b1e874e38dab |
parent 6333 | b1dec44d0018 |
child 11185 | 1b737b4c2108 |
permissions | -rw-r--r-- |
2002 | 1 |
(* Title: HOL/Auth/OtwayRees_Bad |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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Copyright 1996 University of Cambridge |
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Inductive relation "otway" for the Otway-Rees protocol. |
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The FAULTY version omitting encryption of Nonce NB, as suggested on page 247 of |
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Burrows, Abadi and Needham. A Logic of Authentication. |
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Proc. Royal Soc. 426 (1989) |
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*) |
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OtwayRees_Bad = Shared + |
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Changing "lost" from a parameter of protocol definitions to a constant.
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consts otway :: event list set |
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inductive otway |
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intrs |
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(*Initial trace is empty*) |
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Nil "[]: otway" |
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(*The spy MAY say anything he CAN say. We do not expect him to |
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invent new nonces here, but he can also use NS1. Common to |
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all similar protocols.*) |
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Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
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Fake "[| evs: otway; X: synth (analz (knows Spy evs)) |] |
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==> Says Spy B X # evs : otway" |
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Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
paulson
parents:
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(*A message that has been sent can be received by the |
76f3865a2b1d
Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
paulson
parents:
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intended recipient.*) |
76f3865a2b1d
Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
paulson
parents:
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Reception "[| evsr: otway; Says A B X : set evsr |] |
76f3865a2b1d
Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
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parents:
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==> Gets B X # evsr : otway" |
76f3865a2b1d
Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
paulson
parents:
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2002 | 33 |
(*Alice initiates a protocol run*) |
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Got rid of not_Says_to_self and most uses of ~= in definitions and theorems
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OR1 "[| evs1: otway; Nonce NA ~: used evs1 |] |
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Now with Andy Gordon's treatment of freshness to replace newN/K
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==> Says A B {|Nonce NA, Agent A, Agent B, |
4d68fbe6378b
Now with Andy Gordon's treatment of freshness to replace newN/K
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Crypt (shrK A) {|Nonce NA, Agent A, Agent B|} |} |
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Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
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# evs1 : otway" |
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(*Bob's response to Alice's message. |
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This variant of the protocol does NOT encrypt NB.*) |
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9b4bed3f394c
Got rid of not_Says_to_self and most uses of ~= in definitions and theorems
paulson
parents:
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OR2 "[| evs2: otway; Nonce NB ~: used evs2; |
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Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
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parents:
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Gets B {|Nonce NA, Agent A, Agent B, X|} : set evs2 |] |
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==> Says B Server |
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Now with Andy Gordon's treatment of freshness to replace newN/K
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{|Nonce NA, Agent A, Agent B, X, Nonce NB, |
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Swapped arguments of Crypt (for clarity and because it is conventional)
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Crypt (shrK B) {|Nonce NA, Agent A, Agent B|}|} |
3659
eddedfe2f3f8
Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
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parents:
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# evs2 : otway" |
2002 | 47 |
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(*The Server receives Bob's message and checks that the three NAs |
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match. Then he sends a new session key to Bob with a packet for |
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forwarding to Alice.*) |
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5434
9b4bed3f394c
Got rid of not_Says_to_self and most uses of ~= in definitions and theorems
paulson
parents:
5359
diff
changeset
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OR3 "[| evs3: otway; Key KAB ~: used evs3; |
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Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
paulson
parents:
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Gets Server |
2002 | 53 |
{|Nonce NA, Agent A, Agent B, |
2284
80ebd1a213fd
Swapped arguments of Crypt (for clarity and because it is conventional)
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parents:
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Crypt (shrK A) {|Nonce NA, Agent A, Agent B|}, |
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Nonce NB, |
2284
80ebd1a213fd
Swapped arguments of Crypt (for clarity and because it is conventional)
paulson
parents:
2131
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|
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Crypt (shrK B) {|Nonce NA, Agent A, Agent B|}|} |
3659
eddedfe2f3f8
Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
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parents:
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: set evs3 |] |
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==> Says Server B |
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{|Nonce NA, |
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2516
4d68fbe6378b
Now with Andy Gordon's treatment of freshness to replace newN/K
paulson
parents:
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diff
changeset
|
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Crypt (shrK A) {|Nonce NA, Key KAB|}, |
4d68fbe6378b
Now with Andy Gordon's treatment of freshness to replace newN/K
paulson
parents:
2451
diff
changeset
|
61 |
Crypt (shrK B) {|Nonce NB, Key KAB|}|} |
3659
eddedfe2f3f8
Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
paulson
parents:
3519
diff
changeset
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# evs3 : otway" |
2002 | 63 |
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(*Bob receives the Server's (?) message and compares the Nonces with |
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5434
9b4bed3f394c
Got rid of not_Says_to_self and most uses of ~= in definitions and theorems
paulson
parents:
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diff
changeset
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those in the message he previously sent the Server. |
9b4bed3f394c
Got rid of not_Says_to_self and most uses of ~= in definitions and theorems
paulson
parents:
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diff
changeset
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Need B ~= Server because we allow messages to self.*) |
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76f3865a2b1d
Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
paulson
parents:
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OR4 "[| evs4: otway; B ~= Server; |
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Restored the ciphertext in OR4 in order to make the spec closer to that in
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Says B Server {|Nonce NA, Agent A, Agent B, X', Nonce NB, |
0218c486cf07
Restored the ciphertext in OR4 in order to make the spec closer to that in
paulson
parents:
3683
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changeset
|
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Crypt (shrK B) {|Nonce NA, Agent A, Agent B|}|} |
3659
eddedfe2f3f8
Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
paulson
parents:
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changeset
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: set evs4; |
6308
76f3865a2b1d
Added Bella's "Gets" model for Otway_Rees. Also affects some other theories.
paulson
parents:
5434
diff
changeset
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Gets B {|Nonce NA, X, Crypt (shrK B) {|Nonce NB, Key K|}|} |
3659
eddedfe2f3f8
Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
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parents:
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: set evs4 |] |
eddedfe2f3f8
Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
paulson
parents:
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==> Says B A {|Nonce NA, X|} # evs4 : otway" |
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(*This message models possible leaks of session keys. The nonces |
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identify the protocol run.*) |
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Oops "[| evso: otway; |
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Swapped arguments of Crypt (for clarity and because it is conventional)
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Says Server B {|Nonce NA, X, Crypt (shrK B) {|Nonce NB, Key K|}|} |
3659
eddedfe2f3f8
Renamed "evs" to "evs1", "evs2", etc. in protocol inductive definition
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parents:
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: set evso |] |
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Expressed most Oops rules using Notes instead of Says, and other tidying
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==> Notes Spy {|Nonce NA, Nonce NB, Key K|} # evso : otway" |
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end |