1.	Use the command 'openssl s_client' to connect to
	a secure web server: port 443 on www.psg.com.
	Use 'openssl x509' to get a text printout of the certificate.
	What are some of the significant items in the certificate?

2.	You want to secure a WiFi phone.  Each voice sample is
	sent, compressed, as a separate packet, over an unreliable
	wireless net with no error correction or retransmission.
	What mode of encryption would you use?

3.	Suppose you're using a time-based authentication token like
	a SecurID.  The token calculates {T}K where K is a wired-in
	key and T is the time of day.   No other cryptography is used.
	Should the encryption algorithm be a block cipher or a stream cipher?