Definition
Encryption is the process of converting readable data into a scrambled format that can only be decoded by someone with the correct key. Think of it as putting a message into a locked box — anyone can carry the box, but only the person with the right key can open it and read what is inside. Encryption protects data both when it is being sent across the internet (in transit) and when it is stored on a server or device (at rest). Without the decryption key, the scrambled data is meaningless.
Why It Matters
Your business handles sensitive information every day — customer details, payment card numbers, contracts, internal communications. If any of that data is intercepted or stolen without encryption, it is immediately readable and exploitable. With encryption, even if someone gains access to the data, they cannot make sense of it. Encryption is also a legal requirement in many contexts. Regulations like GDPR expect you to protect personal data, and encryption is one of the primary methods for doing so. Getting this wrong can result in fines, legal action, and reputational damage that is difficult to recover from.
Example
A customer enters their credit card details on your online shop. Encryption ensures that as those details travel from their browser to your payment processor, they are scrambled into unreadable text. Even if a hacker intercepts the data mid-journey, they see nothing useful — just a string of random characters. The payment processor, which holds the decryption key, converts it back into the original card details to process the transaction.