NPTEL Cryptography And Network Security ASSIGNMENT 1 Answers:- Hello students in this article we are going to share NPTEL Cryptography And Network Security assignment week 1 answers. All the Answers provided below to help the students as a reference, You must submit your assignment at your own knowledge.
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NPTEL Cryptography And Network Security Assignment 1 Answers 2022:-
Q1. A traditional cryptosystem consists of.
(a) three tuple.
(b) four tuple.
(c) five tuple.
(d) six tuple.
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2. Let P,C, K denote plaintext space, ciphertext space and key space re- spectively. In Shift Cipher, P = C = K = Z26. If the key for Shift Cipher is k = 12 and plaintext is 21 then ciphertext is
3. Caesar Cipher is an example of
(a) Poly-alphabetic Cipher
(b) Mono0-alphabetic Cipher
(c) both (a) and (b)
(d) neither (a) nor (b)
Q4. Shift cipher is secure. The above statement is …
e.It cannot be determined from the information given
5. The key-space for vigenere cipher of length m (mn is a positive integer) S
(d) None of the above
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6. Which are the most frequently found letters in the English language ?
Q7. If the sender and receiver use different keys, the system is referred to as
(a) symmetric system.
(b) asymmetric system.
(c) none of these.
8. ……………………………….. is the concept that tells us about the replacement of every alphabet and the entire series gets ‘shifted’ by some fixed quantity.
(a) Block cipher.
(b) Playfair cipher.
(c) Vegenere cipher
(d) Shift cipher.
Answer:- 9. Suppose the ciphertext for caeser cipher is “SDUWB”. Which of the following is the corresponding plaintext? (a) parti (b) block (c) party (d) none of these. Answer:- Q10. Cryptography works for (a) only Entity authentication (b) only Non repudiation of message (c) only Confidentiality (d) All of them. Answer:-
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