Before ccds were invented, what was the device most commonly used for imaging with optical telescopes? photographic glass plates polaroid cameras high-speed film video cameras

3. bob is arguing that if you use output feedback (ofb) mode twice in a row to encrypt a long message, m, using the same key each time, it will be more secure. explain why bob is wrong, no matter what encryption algorithm he is using for block encryption (15 points).

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service

Retype the statements, correcting the syntax errors. system.out.println("num: " + songnum); system.out.println(int songnum); system.out.println(songnum " songs"); note: these activities may test code with different test values. this activity will perform two tests: the first with songnum = 5, the second with songnum = 9. see how to use zybooks.