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The most commonly used public key cryptographic means are Rivest-Shamir-Adleman (RSA) and Elliptic Curve Cryptography (ECC). RSA calculates the product of two large prime numbers and tries to find difficulty of factoring it. However, ECC is a comparatively newer approach in the field of public key cryptography which is based on the algebraic structure of elliptic curves over finite fields. In the matter of performance, ECC is accessed to be faster than RSA. Hence it has become a default choice for the public key cryptosystem for resource constrained systems like IoT.

In the recent times Cryptographic Hash function has emerged as a new approach towards security by converting a bit string of variable length into a fixed-length hash value. Significantly the conversion function is a one way conversation function only, which cannot have any reverse function mechanism. The Hash functions maintains following four vital characteristics in terms of mathematics and algorithm: (i) Function of low computing complexity. (ii) It is an irreversible or “one-way” function. (iii) Non-feasibility for modifying input value with non-alternation of the hash (iv) As a matter of rule it must be followed by using a common and one hash, it must not be possible to have multiple corresponding inputs.