A Robust and Effective Smart-Card-Based Remote User Authentication Mechanism Using Hash Function

Algorithm 6

Role specification in HLPSL for the goal and environment of our scheme.

role environment()

def =

const 𝑢_𝑖,  𝑠_𝑗: agent,

 𝑆𝐾_{𝑢𝑖𝑠𝑗}: symmetric_key,

 ℎ: hash_func,

 alice_bob_tc, bob_alice_ts,

 alice_bob_rc, bob_alice_rs,

 subs1, subs2: protocol_id

 intruder_knowledge = {𝑢_𝑖, 𝑠_𝑗, ℎ}

 composition

  session(𝑢_𝑖, 𝑠_𝑗, 𝑆𝐾_{𝑢𝑖𝑠𝑗}, ℎ)

   ∧ session(𝑢_𝑖, 𝑠_𝑗, 𝑆𝐾_{𝑢𝑖𝑠𝑗}, ℎ)

end role

goal

 secrecy_of subs1

 secrecy_of subs2

 authentication_on alice_bob_tc

 authentication_on alice_bob_rc

 authentication_on bob_alice_ts

 authentication_on bob_alice_rs

end goal

environment()