Hybrid Secure Authentication and Key Exchange Scheme for M2M Home Networks

Table 5

Notation of the proposed scheme.

Notation	Description
	The secret key of the M2M server
	Mobile user’s ID
	Temporal Mobile User’s ID
	M2M server’s ID
	User’s password
	The session key between User and M2M server
	Home Gateway ID
	Temporal Home Gateway ID
	User State
	Home Gateway State
	concatenation of and
	Most significant bits of string
	Cryptographic SHA256 hash function
	Cryptographic SHA1 hash function
	Using AES function to encrypt a with b as the key
	Using AES function to decrypt a with b as the key
	Keyed Cryptographic Mac and Hash Function
	User ECDH Key Pairing Identifier
	ECDH Secret Key
	ECDH User Public Key
	ECDH User Private Key
	ECDH M2M Server Public Key
	ECDH M2M Server Private Key
	ECDH Key Pair Generation for Entity
	M2M Server ECDH Secret Key Derivation
	ECDH Encryption with input
	ECDH Decryption with input
	Encryption Key
	MAC (Message Authentication Code) Key