ISO One-Pass Unilateral Authentication Protocol with CCFs (Cryptographic Check Functions)

Purpose

The keyed function fKab(X) returns hashed value for data X in a manner determined by the key Kab.

Informal Specification

  1. A -> B: [Ta|Na],B,text2,fKab([Ta|Na],B,text1)

See Commonly Used Representations

MSR Specification

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--- Author: rishav
--- Date: 10 December 2007
--- ISO One-Pass Unilateral Authentication Protocol with CCFs (Cryptographic Check Functions)
---
---       A -> B: [Ta|Na],B,text2,fKab([Ta|Na],B,text1)
(reset)
(
module ISOPublicCCf
export * .

key : type.
shrk : princ -> princ -> type.          shrk A B <: key.
nonce : type.                           nonce  <: msg.
f : key -> msg -> msg.
text: type.				text <: msg.

net : msg -> state.

initiator:
forall A : princ.
{
  ISOinitRule1:
  forall B : princ.
  forall Kab : shrk A B.
  forall text2 : text.
  forall text1 : text.
    empty
  => exists Na : nonce.
     net (B & Na & text2 & f Kab (Na & B & text1)).
}


receiver:
forall B : princ.
{
  ISORecRule2:
  forall A : princ. 
  forall Kab : shrk A B.
  forall text2 : text.
  forall text1 : text.
    net (B & Na & text2 & f Kab (Na & B & text1))
  => empty.
}

)