Towards a New Algorithm to Optimize IPv6 Neighbor Discovery Security for Small Objects Networks

Table 1

The characteristics of SHA-1 and SHA-512.

	SHA1	SHA512
Message size	2^64 bits maximum	2^128 bits maximum
Block size	512 bits	1024 bits
Word size	32 bits	64 bits
Size of digest	160 bits	512 bits
Security level	Collision in 263 operations	2^128 bits