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H192077 Pages: 1

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

EIGHTH SEMESTER B.TECH DEGREE EXAMINATION(S), OCTOBER 2019

Course Code: EC468
Course Name: SECURE COMMUNICATION

PARTA

Answer any two full questions, each carries 15 marks.
Discuss different types of attacks.
Differentiate between privacy, integrity and authentication in security services.
Differentiate security mechanisms in detail.
Discuss the properties of Group, Ring and Field. Give examples.
Discuss about GF(2).
Discuss Euclidean algorithm.
Discuss attacks on availability.

PART B
Answer any two full questions, each carries 15 marks.

Encrypt the word COMMUNICATION with key as CRYPTO using Play fair cipher.
Discuss the security of OTP.
Explain differential cryptanalysis.
With necessary diagrams, explain AES.
Discuss any poly-alphabetic cipher with an example.
Encrypt the word CRYPTO with key as 4 using Ceaser Cipher.
Discuss any transposition cipher with an example.
PART C
Answer any two full questions, each carries 20 marks.
Explain PKDS with PKCS. Give comparison.
What is the difference between symmetric encryption and asymmetric encryption?
Discuss the steps for RSA. Perform the encryption and decryption for = 7, 4 = 14, ९ =
4 and M = 5.
Explain statistical anomaly detection.
Give a few password selection strategies.
How is Public Key Certificates Validated?

Discuss intrusion detection exchange format.

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Duration: 3 Hours

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