EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Question
Chapter 8, Problem R4RQ
Program Plan Intro
An intruder has an encrypted as well as decrypted version of the message.
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Can a message's authentication code alter either the Tag or the ciphertext en route? There can never be a successful assault of this kind since recipients will always be able to identify a modified Tag/ciphertext.
Attacks on a cipher that use letter frequency can be made more difficult by assigning multiple codes to the most frequently used letters in the alphabet. Such a cipher is called a homophonic cipher. Explain why multiple codes cause no increase in the time to decipher a message if the key is known.
Is it feasible for a message authentication code to modify either the Tag or the ciphertext while the message itself is still in transit? This attack can never be successful since recipients will be able to recognize when a tag or ciphertext has been altered.
Chapter 8 Solutions
EBK COMPUTER NETWORKING
Ch. 8 - Prob. R1RQCh. 8 - Prob. R2RQCh. 8 - Prob. R3RQCh. 8 - Prob. R4RQCh. 8 - Prob. R5RQCh. 8 - Prob. R6RQCh. 8 - Prob. R7RQCh. 8 - Prob. R8RQCh. 8 - Prob. R9RQCh. 8 - Prob. R10RQ
Ch. 8 - Prob. R11RQCh. 8 - Prob. R12RQCh. 8 - Prob. R13RQCh. 8 - Prob. R14RQCh. 8 - Prob. R15RQCh. 8 - Prob. R16RQCh. 8 - Prob. R17RQCh. 8 - Prob. R18RQCh. 8 - Prob. R19RQCh. 8 - Prob. R20RQCh. 8 - Prob. R21RQCh. 8 - Prob. R22RQCh. 8 - Prob. R23RQCh. 8 - Prob. R24RQCh. 8 - Prob. R25RQCh. 8 - Prob. R26RQCh. 8 - Prob. R27RQCh. 8 - Prob. R28RQCh. 8 - Prob. R29RQCh. 8 - Prob. R30RQCh. 8 - Prob. R31RQCh. 8 - Prob. R32RQCh. 8 - Prob. R33RQCh. 8 - Prob. P1PCh. 8 - Prob. P2PCh. 8 - Prob. P3PCh. 8 - Prob. P4PCh. 8 - Prob. P5PCh. 8 - Prob. P6PCh. 8 - Prob. P8PCh. 8 - Prob. P12PCh. 8 - Prob. P13PCh. 8 - Prob. P14PCh. 8 - Prob. P18PCh. 8 - Prob. P20PCh. 8 - Prob. P21PCh. 8 - Prob. P22PCh. 8 - Prob. P23P
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Similar questions
- Suppose that an intruder has an encrypted message as well as the decrypted version of that message. Can the intruder mount a ciphertext-only attack, a known-plaintext attack, or a chosen-plaintext attack?arrow_forwardSuppose that when a long string of text is encrypted using a Vigen`ere cipher, the same string is found in the ciphertext starting at several different positions. Explain how this information can be used to help determine the length of the key.arrow_forwardConsider the following scenario: a lengthy string of text is encrypted using a Vigen'ere cypher, and the same string is discovered in the ciphertext beginning at various locations. Demonstrate how this information may be utilised to assist calculate the length of the key by explaining how it is obtained.arrow_forward
- The adversary manipulates the Tag (the encrypted message) by means of the MAC (message authentication code). What are the specific consequences of my action? The victim of such an assault will always be able to detect a modified Tag or ciphertext.arrow_forwardA secret agent successfully intercepts an encrypted message below: Ciphertext 1 Y C P B R I M R E P J T M P V It is found that the encrypted message is encrypted using a Vigenère cipher and can be decrypted into Plaintext 1 M E E T M E A T T H E P A R K What is the key for the above cipher text and if the next cipher text is encrypted using the same key as the previous message, what is the plaintext? Ciphertext 2 A L W G F J F C C N T Y D N Xarrow_forwardWe conduct a known-plaintext attack against an LFSR. Through trial and error we have determined that the number of states is m =4. The plaintext given by when encrypted by the LFSR produced the ciphertext 11111101 What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g 0101 to represent P3 0, P2 = 1, P = 0, Po = 1) !!arrow_forward
- The adversary manipulates the Tag (the encrypted message) by means of the MAC (message authentication code). What exactly are the results that might occur? If this attack is successful, the victim will be able to immediately recognize any ciphertext or Tag that has been tampered with.arrow_forwardSay you find a ciphertext 384 bits long which is encrypted with the one-time pad. How many keys will you have to try to do a brute-force attack to find the plaintext? How will you know when you have found the correct plaintext?arrow_forwardConsider the following cipher text message that was encrypted using an additive cipher with a k = 11. C = Piaz cerz z d h Decrypt to find and show the corresponding plaintext. Show your work or upload a photo of your work with your name and in your own handwriting.arrow_forward
- Use Elgamal encryption with public prime modulus q=11, to encrypt the message m=3 (Find the ciphertext only). Use your own values for not given parameters. Show your steps in details and provide all your assumptions clearly.arrow_forwardA sender sends the message “Allow Saif to read the confidential file X” to the receiver. But the attacker has modified the original message as “Allow Zahir to read the confidential file X”. What type of attack is implemented in the above statement? a. Passive, Modification of messages b. Passive, Masquerade c. Active, Masquerade d. Active, Modification of messagesarrow_forward6.3 Consider the following threats to Web security and describe how each is countered by a particular feature of SL. a. Brute-Force Cryptanalytic Attack: An exhaustive search of the key space for a conventional encryption algorithm. b. Known Plaintext Dictionary Attack: Many messages will contain predictable plaintext, such as the HTTP GET command. An attacker constructs a dictionary containing every possible encryption of the known-plaintext message. When an encrypted message is intercepted, the attacker takes the portion containing the encrypted knownarrow_forward
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