1. Write true or false:

Digital signature require the sender to use the private key.

Symmetric encryption is best used for small blocks of data, digital signatures, digital envelopes, and digital certificates.

A cipher is a cryptographic system of symbols that represent words or phrases that may be secret but not always confidential.

Collisions are a well-known weakness in cryptography in which plain text messages can generate identical cipher -text messages using different keys and the same algorithm.

Hypertext Transfer Protocol (http) is a means for transmitting and receiving information across the internet.

2. Fill in the blanks

Full form of CHAP is

Full form of LDAP is

The signal where the watermark is to be embedded is called the

A is a trapset to detect, deflect or in some manner counteract attempts at unauthorized use of information systems.

A is a s/w or h/w based network security system that controls the incoming and outgoing network traffic based on applied rule-set.

3. Write short note on following:

Public Key Infrastructure

Steganography

Distinguish between vulnerabilities, threat and control

Risk Analysis

Session Hijacking

4. Explain, how key distribution is achieved in symmetric key encryption.

5. What is digital signature? Describe a public key method to create and check digital signatures.

6. What is cryptography? Define various encryption terms used.

7. With the help of neat diagram, briefly explain the types of fire walls.

8. Explain Network Layer Attack. Discuss packnet sniffing in detail.

9. Describe different types of Intrusion Detection Systems (IDS).