2 Users can pay for premium services on a website using their credit card.a Explain why the website uses https at the beginning of the website address instead of http. [4]b Explain symmetric encryption. [2]The journalists working for the website encrypt their emails.c Describe how asymmetric encryption is used with emails. [2]When the users subscribe to premium features, they have to choose a password.d Suggest how verification can be used when entering the password. [1][Total 9]

a) The website uses https at the beginning of the website address instead of http because https stands for Hyper Text Transfer Protocol Secure. This means that the website is encrypted using an SSL certificate. SSL certificates secure all of your data as it is passed from your browser to the website's server. This prevents hackers from being able to see sensitive information such as credit card numbers or passwords. [4]

b) Symmetric encryption is a method of encryption where the same key is used for both encryption and decryption of the data. This means that the sender and receiver must both have access to the same key in order to read the data. This method is fast and efficient, but the key must be kept secret for the data to remain secure. [2]

c) Asymmetric encryption, also known as public key encryption, uses two different keys for encryption and decryption. The public key is used to encrypt the message and can be shared with anyone. The private key is used to decrypt the message and is kept secret by the recipient. This method is used in emails to ensure that only the intended recipient can read the message. [2]

d) Verification can be used when entering the password by asking the user to enter the password twice. This ensures that the user has typed the password correctly and reduces the chance of errors. Additionally, the website could use a password strength meter to encourage the user to choose a strong password. [1] [Total 9]