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1. A sender needs to send the four data items Ox3456, OxABCC, Ox02BC, and OxEEEE. Answer the following:
a. Find the checksum at the sender site.b. Find the checksum at the receiver site if there is no error.c. Find the checksum at the receiver site if the second data item is changed to OxABCE.d. Find the checksum at the receiver site if the second data item is changed to OxABCE and the third data item is changed to Ox02BA.
2. This problem shows a special case in checksum handling. A sender has two data items to send: Ox4567 and OxBA98. What is the value of the checksum?
Many hackers claim to believe that "access to computers should be unlimited and total" and that "all information should be free." Do you agree with these statements? Why or why not?
Give an example to show that the group of permutations S5 is not commutative and ECB mode with block length 3 and the permutation cipher for the given operation
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Show that a passive eavesdropper that observes a single execution of the protocol can recover key s and impersonate the tag.
From the criminality perspective, do Russia and China do enough in the cyberspace area?
A virus is a program that attaches itself to other programs. An infected user must take some sort of action to spread a virus to others. A worm functions as an independent program
Write a two- page letter to describe what security threats she is facing and how she can decraese these threats. Remember that you are writing for friend, not for a teacher.
Using RSA User1 ciphers his text M with User2 public key and he gets the cipher text C=371 he sends the Ciphertext to User2 who decrypts the cophertext with his private key.
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