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Problem
(a) Using Vigenère cipher and given the key abc, find the ciphertext for the message:
simplicity
Only the 26 lower-case alphabetical characters are used in messages.
(b) Compare and contrast Data Encryption Standard (DES) with Advanced Encryption Standard (AES) with respect to:
(i) their classification (ii) their encryption/decryption structure and algorithm (iii) their cryptographic strength (iv) types of attacks (v) hardware/software implementation
(c) Consider a Diffie-Hellman scheme with a common prime q = 11 and a primitive root α = 2.
(i) If user A has public key YA = 9, what is A's private key XA? (ii) If user B has public key YB = 3, what is the shared secret key K, shared with A?
(d) What are the characteristics of the ‘one-time pad' cryptosystem as compared to Vigenère Cipher.
Give one advantage and two problems with one-time pad cryptosystems.
(e) S/MIME (Secure / Multipurpose Internet Mail Extensions) is a standard for public key encryption and signing of e-mail encapsulated in MIME. What are the cryptographic security services for electronic messaging applications provided by S/MIME?
Techniques for combating Spam mails Many anti spam products are commercially available in market. But it should also be noted that no one technique is a complete solution to
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Q. Explain about Security aware protocols? The security-Aware ad hoc Routing (SAR) protocol based on the security attributes integrated into the ad hoc route discovery provides
ADDRESS RESOLUTION PROTOCOL (ARP) TCP/IP can use any of the three address resolution functions relaying on the addressing procedure used by the underlying hardware. To guarant
QUESTION: (a) Ethernet has grown in popularity in the recent years and is now used in LANs. Give three reasons for the success behind Ethernet. (b) Ethernet uses the CSMA/CD
(a) Describe the concept of zero knowledge proofs. Give a practical example. (b) Explain how a one way hash function works. (c) What are message authentication codes? (d)
The world has to deal with newly released vulnerabilities on a daily basis. These vulnerabilities eventually lead to active exploits of systems, and it is our job as cyber securit
What questions should Iris ask Charlie about the new job, about Kelvin''s team, and about the future of the company?
Question (a) In relation to a TCP segment structure, provide the fields responsible for: i. Connection Management ii. Flow Control iii. Error Control iv. Reliable, in-order
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