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(a) Using the extended Euclidean algorithm, find the multiplicative inverse of 504 mod 67.
(b) Decrypt the following ciphertext, which has been encrypted using Caesar cipher:
YMNXJ CFRNS FYNTS UFUJW NXVZN YJJFX D
(c) (i) Construct the Playfair matrix (5x5) using the keyword: cryptology
(ii) Encrypt the following plain text using the above matrix: billa bong
Question : (a) There are two approaches for providing confidentiality for packets in a network using symmetric encryption: End-to-End Encryption and Link Encryption. State wh
Question: (a) What is Network Address Translation (NAT)? Why is it used? (b) Given a following information by your ISP about your newly acquired Frame Relay connection:
Produce a short report of your experiences in installing and using PGP. The report should be written in the form of a journal that contains at least the following items: A de
QUESTION (a) Define and distinguish between Electronic Commerce and Electronic Business (b) According to you what are the benefits that Electronic Commerce can brings to org
VIRTUAL PACKETS These data packets serve same reason in Internet as frames on LAN. Every packet has a header. Routers, which are normally gateways, transfer packets between ph
Question : (a) What is an IDS and what is the basic problem it faces which can be solved by Artificial Intelligence. (b) Identify and describe briefly an Artificial Intell
TOKEN RING Many LAN methods that are ring topology need token passing for synchronized access to the ring. The ring itself is acts as a single shared communication phase. Both
SUCCESS OF IP: IP has accommodated dramatic modification since real design. But basic rules are still appropriate today. There are many new kinds of hardware. SCALING:
discuss the merits and demerits of computers freezing
Question 1: (a) Differentiate between symmetric and asymmetric encryption system. (b) Describe how a digital signature is created. (c) Explain briefly what SSL (secure so
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