Could a standard of time be based on the period of a certain standard pendulum? What advantages and disadvantages would such a standard have compared to the actual present-day standard discussed in Section 1.3?

Leslie Ogu CSCI 4531 09/20/2016 - Chapter 21: Public-Key Encryption and Message Authentication Secure Hash Algorithm ● SHA was originally developed by NIST ● Published as FIPS 180 in 1993 ● Was revised in 1995 as SHA-1 ○ Produces 160-bit hash values ● NIST issued revised FIPS 180-2 in 2002 ○ Adds 3 additional versions of SHA ○ SHA-256, SHA-384, SHA-512 ○ With 256 / 384 / 512-bit hash values ○ Same basic structure as SHA-1 but greater security ● In 2005, NIST announced the intention to phase out approval of SHA-1, and move to a reliance on the other SHA version by 2010 SHA Comparisons on slides N 1024 bits diagram in slides SHA-3 ● SHA-2 shares same str