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Let DES(x, K) represent the encryption of plaintext x with key K using the DES cryptosystem. Suppose y = DES(x, K) and y’ = DES(c(x), c(K)), where c(·) denotes the bitwise complement of its argument [i.e. changing all the 1’s to 0’s and all the 0’s to 1’s.
For example, if t = 10000110, then c(t) = 01111001; equivalently, c(t) = t ? 11111111].
Prove that y’ = c(y) (i.e., if we complement the plaintext and the key, then the ciphertext is also complemented). [This is Question 3.3 of the textbook. Hint: this can be proved using the “high-level” description of DES encryption Feistel structure algorithm.
Search the Internet for good examples of cases that involve ethical issues and the abuse of privacy. Provide a review and analysis of your findings.
Create the statements to make an overloaded constructor for the class named Car. The constructors should support 0, 1, or 2 arguments. The 1st argument will denote engine size and contain an Integer.
You are an ISP that has been assigned a class B network with the address 145.34.0.0. You know you will service 200 to 250 small companies.
Need a research paper on "What is the single most important new technology that has affected digital forensics in the last five years and why?" The paper has to be well referenced.
Need a 1000 word paper on the various recent/news on the United States (particular the group known as Anonymous and Lulzsec). Also need the various strategies to prevent such cyber warfare attacks and prevention techniques.
Explain why asynchronous I/O activity is a problem with many memory protection schemes, including base/bounds and paging. Suggest a solution to the problem.
At ABC Institute, researchers are unsure about type of key (Asymmetric or Symmetric) to be used. Formulate possible solution and explain advantages and disadvantages of any solution employed.
Computer Security is very important for organizations and if not impliedproperly it may have a very big impact on its overall working system.
Using blocks of 4 encrypt the message I AM AN MSC STUDENT MAJORING IN SECURITY using the public key above. Similarly use the private key above to decrypt the cipher text.
Study how the database and web services can be protected against unauthorized use while maintaining access for authorized users by using firewall and VPN techniques
Implement both encryption AND decryption of the Vigenere cipher with 26 English letters and 1 space character "_" in its tableau as shown in class.
What does privacy mean to you? Is privacy a right or a privilege? How should one's privacy be legally protected or secured, especially when using the Internet?
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