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1. A particular cipher is implemented by combining the ASCII representation of plaintext characters with pseudorandom bytes (eight-bit binary strings of 1s and 0s) using the XOR function. In the process of encrypting a message, a character in the plaintext, a capital H, is XORed with the pseudorandom byte 10111100.
a. What is the ciphertext (in binary form) generated by the encryption of the character D? (Please show your work.)b. How is the plaintext for this encrypted D recovered? (show your work.)
2. Consider the following plaintext message: THE REDSKINS ARE A NFL TEAM.
a.If this message is sent unencrypted and successfully received, what is its entropy?b.If this message is encrypted with DES using a random 56-bit key, what is the encrypted message's entropy?
3. You are Alice. You have agreed with your friend Bob that you will use the Diffie-Hellman public-key algorithm to exchange secret keys. You and Bob have agreed to use the public base g = 3 and public modulus p = 809. You have secretly picked the value SA = 17. You begin the session by sending Bob your calculated value of TA. Bob responds by sending you the value TB = 291. What is the value of your shared secret key?
CS 470: Cryptography and Network Security, Compare the RSA and EIGamal signature schemes' performance in terms of efficiency of the verification operation, ability to pre-compute most of the signature operation in advance.
Need assistance on how to write a good report on named "comparison of Voice and ear Biometrics as a measure to passport control"
phase 1 communication between Alice and Bob. Suppose the raw keys consist of k bits each. What is the expected number of bits on which Alice's and Bob's raw keys agree? Explain your answer.
You have secretly picked value SA = 17. You begin session by sending Bob your computed value of TA. Bob responds by sending you value TB = 291. What is the value of your shared secret key?
You are investigating a case involving an employee who is allegedly sending inappropriate photos via e-mail in attachments that have been compressed with a zip utility.
concept of Message Digest, File Carving, MD5, Locard's Exchange, Parker's categories, computer-related crime as suggested by Donn Parker, computer systems as sources of digital evidence
cryptography assignment: Consider the following problems: (P1) computing the output p from an input n; (P2) computing the output phi(n) from an input n. Which one of the following statements is true?
In Diffie-Helman protocol, the common modulus is selected as n = 19 and the generator g is chosen to be 2. Alice and Bob select numbers 6 and 10 privately.
Give the security levels Top SECRET,SECRET,CONFIDENTIAL, and UNCLASSIFIED (order from highest to lowest), and catergories A, B,C, specify what type of access (read,write, both or neither) is allowed in each of the following situations .
The initial state is not output (in contrast to the example). Is this version of two-bit system noninterference-secure with respect to Lucy? Why or why not?
You were given the following plaintext and cipertext, and you are needed to find key used by them. plaintext: Using Vigene table, find key used by them to encrypt the message.
How will your company ensure adequate destruction of the materials thus ensuring an individual's privacy? Will any state-wide, national, or industry standards be met? If so, which ones and how?
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