Attacks on Computer And Computer Security 1.1 Introduction

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What does encryption do in cryptography?

Converts cipher text to plain text

Protects data by encoding it (correct)

Decodes encrypted data

Randomizes data to make it unreadable

What is the purpose of encryption systems using a pseudo-random encryption key?

To decode messages without a key

To simplify the encryption process

To speed up the decryption process

To ensure security and prevent unauthorized decryption (correct)

Which type of encryption is ideal for real-time communications?

Block ciphers

Symmetric key cryptography

Stream ciphers (correct)

Asymmetric key cryptography

What is required for successful decryption of encrypted data?

The correct encryption key Signup and view all the answers

What is the main function of decryption in cryptography?

Reversing the encryption process Signup and view all the answers

What distinguishes symmetric key cryptography from asymmetric key cryptography?

Use of a single key for both encryption and decryption Signup and view all the answers

Why is encryption necessary for secure transmission and storage of sensitive data?

To protect data from unauthorized access Signup and view all the answers

When does the decryption process take place in communication?

At the receiver's end Signup and view all the answers

What is one way to decrypt encrypted data?

Use a secret key or password Signup and view all the answers

Why does encryption not prevent interference in itself?

It hinders unauthorized access but does not stop interference completely Signup and view all the answers

What is the process of converting encrypted or cipher text back into plain text called?

Decryption Signup and view all the answers

In cryptography, what is the primary purpose of encryption?

To convert plain text to cipher text Signup and view all the answers

What distinguishes stream ciphers from block ciphers in terms of data encryption?

The size of data chunks encrypted at a time Signup and view all the answers

Why does decryption require a secret key or password?

To decode encrypted information Signup and view all the answers

What is the advantage of symmetric key cryptography over asymmetric key cryptography?

Ease of key management Signup and view all the answers

Which type of key is used in symmetric key cryptography for both encryption and decryption?

Individual key Signup and view all the answers

What operation is used to combine plaintext with the key stream in RC4 encryption?

Bitwise XOR Signup and view all the answers

What does the Key-Scheduling Algorithm (KSA) do in RC4 encryption?

Generates the permutation of available bytes Signup and view all the answers

Why has there been a call to stop using RC4 encryption algorithms?

Proof of flaws and cyber attacks Signup and view all the answers

What is a drawback identified in the usage of RC4 encryption with small data streams?

Cannot operate efficiently with tiny data streams Signup and view all the answers

What technology or protocol banned the usage of RC4 in its TLS protocols in 2015?

Internet Engineering Task Force (IETF) Signup and view all the answers

What is a benefit of using RC4 encryption compared to other ciphers?

Simple construction Signup and view all the answers

In RC4 encryption, what is required for successful decryption?

'Robust MAC' Signup and view all the answers

What distinguishes RC4A+ from the basic RC4 algorithm?

'A more complex key schedule' Signup and view all the answers

In RC4 encryption, what is combined one byte at a time with the plaintext stream cipher using XOR operation?

Key stream Signup and view all the answers

Which organization issued recommendations to limit the use of RC4 due to threat vulnerabilities?

Mozilla Signup and view all the answers