Security

• Accidental damage could occur, such as file corruption and human errors • Malicious actions may be taken by other people to view, delete, copy and/or corrupt data without authorisation

• Secure Socket Layer • Provides secure connection between internet browser and websites • Allows transmission of private data • Indicated by padlock sign on the web browser (sometimes the address bar is green) • Uses two keys to encrypt the data: a public key known to everyone and a private key only known to the recipient • URLs that require an SSL connection start with ‘https’ • e.g. e-commerce shops use SSL to keep credit card details secret

A type of encryption where the same key is used to encrypt and decrypt the message. This differs from asymmetric (or public-key) encryption, which uses one key to encrypt a message and another to decrypt the message. Increasing the length of the key increases the strength of the encryption.