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

Algorithm 5

Role specification in HLPSL for the session of our scheme.

role session(𝑈_𝑖, 𝑆_𝑗: agent, 𝑆𝐾_{𝑢𝑖𝑠𝑗}: symmetric_key,

     𝐻: hash_func)

def =

local SI, SJ, RI, RJ: channel (dy)

composition

    alice(𝑈_𝑖, 𝑆_𝑗, 𝑆𝐾_{𝑢𝑖𝑠𝑗}, 𝐻, SI, RI)

    ∧ bob(𝑈_𝑖, 𝑆_𝑗, 𝑆𝐾_{𝑢𝑖𝑠𝑗}, 𝐻, SJ, RJ)

end role