What is a one-time-pad?
How to make backups?
How are block ciphers used to encrypt data longer than the block size?
What makes a product cipher secure?
What are ECB, CBC, CFB, OFB, and PCBC encryption?
shall we use a journalling filesystem on top of /dev/loop?
Which of the two ciphers have the larger key space?
What are good sources of randomness?
What are the most important attacks on symmetric block ciphers?
Are one-time pads really unbreakable?
What are the most important attacks on stream ciphers ?
what is CBC?
What can be proven about the security of a product cipher?
What are IP Tunnels?
Is ECB cipher mode faster than CBC ?