How was NSA involved in the design of DES?
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How to encrypt swap?
What is a one-time-pad?
What are the most important attacks on stream ciphers ?
How are block ciphers used to encrypt data longer than the block size?
What is differential cryptanalysis?
Which cipher is the strongest one?
What are the properties of product ciphers?
What are some group-theoretic properties of product ciphers?
Can symmetric block ciphers be used for message authentication?
Is DES available in software?
What is a product cipher?
Is DES available in hardware?