iGCSE Encryption Computer Science

What is symmetric encryption?

• A type of encryption where different keys are used for encryption and decryption

• A type of encryption that only works for text messages

• A type of encryption that doesn't require a key

• A type of encryption where the same key is used for both encryption and decryption

Give an example of a symmetric encryption algorithm.

• RSA (Rivest-Shamir-Adleman)

• AES (Advanced Encryption Standard)

• MD5 (Message-Digest Algorithm 5)

• SHA-1 (Secure Hash Algorithm 1)

What is asymmetric encryption?

• A method of encryption that uses a combination of numbers and letters to encrypt data.

• A method of encryption using a pair of keys (public and private) to encrypt and decrypt data.

• A method of encryption that does not involve any keys.

• A method of encryption using only one key to encrypt and decrypt data.

What is key management in the context of encryption?

• The management of password policies

• The management of encryption keys

• The management of software updates

• The management of network protocols

What are the advantages of symmetric encryption over asymmetric encryption?

• Faster and more efficient

• Slower and less efficient

• Less secure and more vulnerable to attacks

• More complex and difficult to implement

What are the advantages of asymmetric encryption over symmetric encryption?

• Better security with the use of two different keys

• More vulnerable to hacking and unauthorized access

• Less secure due to the use of two different keys

• Faster encryption and decryption process

Explain the process of key exchange in asymmetric encryption.

• The process involves using the same key for both encryption and decryption

• The process only involves using a public key for encryption

• The keys are randomly generated and not shared between parties

• Public and private keys are used to securely share a session key between two parties.

What are the potential security risks associated with public key infrastructure?

• Software updates, password strength, and firewall configuration

• Physical security, biometric authentication, and data encryption

• Phishing attacks, social engineering, and malware infections

• Key compromise, certificate authority compromise, and man-in-the-middle attacks

How does encryption contribute to data security in computer systems?

• By scrambling data into an unreadable format, making it difficult for unauthorized users to access the information.

• By organizing data into easily accessible files

• By allowing open access to all users

• By creating duplicate copies of the data

What is the main advantage of using public key infrastructure for encryption?

• Increased speed of encryption and decryption

• Enhanced security through secure key exchange

• Reduced complexity in encryption algorithms

• Improved compatibility with legacy systems