What exactly is DES?
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What is a block cipher ? what are various block ciphers?
Can DES be used to protect classified information?
What are some group-theoretic properties of product ciphers?
What is a product cipher?
How to make backups?
shall we use a journalling filesystem on top of /dev/loop?
What are good sources of randomness?
Are one-time pads really unbreakable?
Can symmetric block ciphers be used for message authentication?
How are block ciphers used to encrypt data longer than the block size?
Is DES available in hardware?
What is triple DES?