Data transmitted across the internet can be intercepted by unauthorised users.
Identify one reason why a company would encrypt its customer data before transmitting it over a public network.
To prevent unauthorised users from physically intercepting the network signals.
To ensure that if the data is intercepted, it cannot be understood without the decryption key.
To reduce the file size of the data so that it transmits much faster.
To automatically detect and block the IP addresses of any attackers.
16 exam-style questions on Edexcel IGCSE Computer Science Encryption. Each one has a worked solution and a mark scheme showing where the marks go.