Jawaharlal Nehru Technological University Hyderabad MCA 2018 Information Security Previous Question Paper (June/July - 2018 - R15)

Information is characterized by several key attributes that define its value and utility:

• Accuracy: Information must be correct, reliable, and free from errors.
• Timeliness: Information must be available when it is needed for decision-making.
• Completeness: It should contain all necessary data to provide a full picture of the subject.
• Relevance: Information must be pertinent to the context or problem being addressed.
• Accessibility: It must be easily retrievable by authorized users.

A Stream Cipher is a symmetric key encryption algorithm that encrypts plaintext digits one at a time, typically by combining them with a pseudorandom cipher bit stream (keystream). The encryption process involves an XOR operation between the plaintext bit and the keystream bit. Because they process data bit-by-bit or byte-by-byte, stream ciphers are generally faster than block ciphers and are ideal for real-time communication applications.