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Assume that there is a block cipher ABC that always encrypts block of b=72 bits using key of k= 60 bits. We know that ABC will be broken even using simple brute-force attacking by guessing the encryption key. To enhance the security level, assume that someone proposes to use XYZ by use of 2 encryptions of ABC with 2 different independent keys. Prove that XYZ does not provide a much stronger security than ABC. Prove in detail why this statement is true. (You have to analyze in detail a method attacking XYZ using time that is not much longer than the brute force attacking on ABC.)
Show a message that Alice may have spoofed, and demonstrate that its hash value collides with Bob's original hash.
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.
Servers, administrative and support users 2 subnets with 50 hosts for faculty & student labs 10 or more WAN links for point-to-point home office address. Design the subnet?
User A and B use Diffie-Hellman algorithm to exchange a shared key and generate public keys of their own. Consider a common prime number q=71If user A has private key=5, what is A's public key?
The size of the frame is long enough to guarantee the detection of collision by both stations. Find: The time when station C hears the collision (t3).
Need assistance on how to write a good report on named "comparison of Voice and ear Biometrics as a measure to passport control"
Write a 1-2 page document that describes the options for improving the FTP environment described. Make a recommendation for a single solution for the FTP environment.
Implement both encryption AND decryption of the Vigenere cipher with 26 English letters and 1 space character
Decrypt to recover the plaintext. What is the decryption function, and the recovered plaintext? What type of cipher is this?
Security mechanism, threat, GSM networks, DDoS attacks, IPv4, IPv6, IPsec integrity, authentication and privacy, IPsec AH, ‘single sign-on' in the context of access control, Secure Electronic Transaction (SET) protoco, Encryption
Assume that evil Charlie eavesdropped on Bob's message to server. How can he with the help of his equally evil buddy Don, extract key K that Alice and Bob are using to protect their communications?
Sally generates key KA when required as KA = h(Alice,KS ),with keys KB and KC generated in similar manner. Explain one advantage and one disadvantage of key diversi?cation.
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