Problem R-7.1
It doesn't matter whether a domain name includes uppercase and lowercase letters, as they are considered the same. So, for instance, example.com is the same as ExamPLE.com and eXamplE.com. Is this case insensitivity also true for the rest of a URL? (Note that you can test this question yourself by visiting any web site that has a URL with more than just a domain name.)
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Problem C-7.8
Suppose a web client and web server for a popular shopping web site have performed a key exchange so that they are now sharing a secret session key. Describe a secure method for the web client to then navigate around various pages of the shopping site, optionally placing things into a shopping cart. Your solution is allowed to use one-way hash functions and pseudo-random number generators, but it cannot use HTTPS, so it does not need to achieve confidentiality. In any case, your solution should be resistant to HTTP session hijacking even from someone who can sniff all the packets.



What are the next three numbers in the pseudo-random number generator 3xi +2 mod 11, starting from 5?explain


Problem R-8.12
Bob is arguing that if you use Electronic Codebook (ECB) mode twice in a row to encrypt a long message, M, using the same key each time that it will be more secure. Explain why
Bob is wrong in the case of using a binary one-time pad encryption scheme.



Name two things that the RSA and ElGamal cryptosystems have in common, other than the fact that they are both public-key cryptosystems?
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