Fig. 2.
Relations between blocks of data are established in a) by linking them together using a one-way hash function, H. If data, d1, is altered in the second block of b), the hashes of all subsequent blocks are altered.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.