Computer Networks (4th Edition) - Problem Solutions by Andrew S. Tanenbaum

By Andrew S. Tanenbaum

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Computer Networks (4th Edition) - Problem Solutions

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39. , that ‘‘e’’ is the most common letter in English text). In effect, it converts the plaintext into junk, increasing the amount of work the cryptanalyst must do to break the message. 46 PROBLEM SOLUTIONS FOR CHAPTER 8 40. No. Suppose the address was a mailing list. Each person would have his or her own public key. Encrypting the IDEA key with just one public key would not work. It would have to be encrypted with multiple public keys. 41. com and it is never supplied. It would be better to supply the IP address to be less conspicuous.

All this scheme does is increase her workload by a factor of two. 35. The two random numbers are used for different purposes. RA is used to convince Alice she is talking to the KDC. RA 2 is used to convince Alice she is talking to Bob later. Both are needed. 36. If AS goes down, new legitimate users will not be able to authenticate themselves, that is, get a TGS ticket. So, they will not be able to access any servers in the organization. Users that already have a TGS ticket (obtained from AS before it went down) can continue to access the servers until their TGS ticket lifetime expires.

406. 21. , 32) spaces in the letter, and potentially replace each one by space, backspace, space. When viewed on the terminal, all variants will look alike, but all will have different message digests, so the birthday attack still works. Alternatively, adding spaces at the end of lines, and interchanging spaces and tabs can also be used. 22. It is doable. Alice encrypts a nonce with the shared key and sends it to Bob. Bob sends back a message encrypted with the shared key containing the nonce, his own nonce, and the public key.

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