Quick Guide to Encryption
Posted January 21, 2025

Encryption: Securing Information
Encryption turns readable data into secret code. Only the right key can unlock it. Here’s a quick guide to how it works and why it matters.
What Is Encryption?
Encryption transforms regular text (plaintext) into unreadable text (ciphertext). Only those with the correct key can turn it back into plaintext. It’s like a secret language for your data.
Why Use Encryption?
To keep data safe. Hackers can’t steal what they can’t read. Encryption protects privacy and secures sensitive information.
How Does It Work?
Encryption relies on algorithms and keys:
- Algorithm: A set of rules to scramble data.
- Key: Like a password to unlock the scrambled data.
Types of Encryption
Symmetric Encryption
Uses one key for both encrypting and decrypting. It’s fast but risky if the key is shared.
Asymmetric Encryption
Uses two keys—a public key to encrypt and a private key to decrypt. Safer, as only the private key can unlock the data.
Common Encryption Methods
- AES: A strong symmetric method with 128, 192, or 256-bit keys. Longer keys are harder to crack.
- RSA: An asymmetric method that uses public and private keys. Common for secure communication.
- DES: An older symmetric method with a 56-bit key. Now mostly replaced by AES.
- ECC: An asymmetric method offering strong security with smaller keys. Ideal for mobile devices.
Everyday Uses of Encryption
- Online Shopping: Protects payment details.
- Messaging Apps: Secures chats so only you and the recipient can read them.
- Email Security: Stops unauthorised access to your emails.
Challenges of Encryption
- Key Management: Lost keys can mean lost data.
- Performance: Encryption needs processing power, which can slow systems.
Staying Safe with Encryption
- Use strong passwords.
- Keep software updated.
- Avoid sensitive activity on public Wi-Fi without a VPN.
Ready to Secure Your Data?
Encryption shields your information from threats. Learn the methods, use them wisely, and keep your data safe. Need help? Get in touch.

Mark Middleton
Mark founded Zaltek in 2019. He loves helping organisations use tech to drive business growth. He leads our technology strategy ensuring we deliver forward-thinking solutions to customers across the UK and beyond.