What is Encryption?
Encryption scrambles your data into unreadable code, so that even if someone steals it, they get nothing but gibberish — unless they hold the key.
Turning readable data into a locked box
Encryption is the process of using math to scramble information so that it looks like meaningless noise to anyone who does not have permission to read it. The original readable data goes in one end, and out the other comes a jumble of characters that reveals nothing on its own. The only way to turn it back into something readable is with the correct key — a secret value that acts like the combination to a lock.
The beauty of this is that you can store or send encrypted data through completely untrusted places — a stolen laptop, a public network, a cloud server you do not fully control — and it stays protected as long as the key stays secret. Encryption is one of the few security tools that still works even after something has gone wrong, which is why it is a cornerstone of protecting against a data breach.
Keys, and two ways to use them
Every encryption scheme relies on keys. There are two broad approaches, and modern systems usually combine them. With symmetric encryption, the same key both locks and unlocks the data — fast and ideal for encrypting large files or a whole hard drive. The challenge is sharing that one key safely.
Asymmetric encryption solves the sharing problem with a pair of keys: a public key anyone can use to lock a message, and a private key only the recipient holds to unlock it. You can hand out the public key freely; without the matching private key, it is useless to an attacker. This is the magic behind the padlock in your browser — when you see HTTPS, your connection uses asymmetric encryption to set up a secure session, then symmetric encryption to move data quickly. A well-run VPN works on the same principles.
Encryption in everyday business
HTTPS websites
The padlock in your browser means the connection between you and the site is encrypted, so passwords and payment details cannot be read in transit. This is encryption protecting data in motion.
Full-disk encryption
BitLocker on Windows and FileVault on Mac encrypt the entire drive. If a laptop is lost or stolen, the thief gets an unreadable disk instead of your files. This protects data at rest.
Encrypted messaging
Apps with end-to-end encryption scramble messages so that only sender and recipient can read them — not even the app's company can see the contents.
Encrypted email and files
Sensitive attachments and emails can be encrypted so that only the intended recipient, holding the right key, can open them — useful for contracts, health, and financial data.
Encrypted backups
Your backups hold everything valuable in one place. Encrypting them means a stolen backup drive or compromised cloud bucket does not hand attackers your whole business.
Database and cloud encryption
Cloud providers can encrypt the databases and storage you keep with them, a key part of cloud security — provided you turn it on and manage the keys.
Putting encryption to work
The good news: most of the encryption you need is already built into the tools you own. The job is mostly turning it on and managing it well. Here is where to focus.
Turn on full-disk encryption everywhere
Enable BitLocker or FileVault on every laptop, desktop, and phone. This single step makes lost or stolen devices a non-event instead of a reportable breach.
Insist on HTTPS
Make sure your own website uses HTTPS, and train staff to look for the padlock before entering credentials. Avoid sending sensitive data over unencrypted connections.
Encrypt your backups
Backups are a prime target. Encrypt them so that a stolen copy is worthless, and so you stay protected even if your backup provider is compromised.
Manage your keys carefully
Store recovery keys and codes somewhere safe and backed up. Lose the key and you lose the data — encryption protects you only if you can still get in.
Encrypt data in the cloud
Verify that the cloud services you use encrypt your data both in transit and at rest, and that you control or trust how the keys are handled.
Remember it is one layer
Encryption protects stolen data, not a logged-in attacker. Pair it with strong passwords and access controls for real protection.
Encryption is also a requirement — sometimes a legal one — under frameworks like HIPAA, PCI DSS, and GDPR. If you handle health, payment, or personal data, our free compliance decision guide helps you see which rules apply and what they expect of you.
Encryption FAQ
What is the difference between data in transit and data at rest?
Data in transit is information moving across a network, like an email being sent or a web page loading. Data at rest is information sitting in storage, like files on a laptop or records in a database. Good security encrypts both, because attackers can target either one.
If I use encryption, am I safe from breaches?
Encryption is a powerful safeguard, but not a force field. It protects data that is stolen in encrypted form, but it cannot help if an attacker logs in as a legitimate user and reads the data after it has been unscrambled. It works best combined with strong passwords, multi-factor authentication, and access controls.
Does encryption slow down my computers?
On modern hardware, almost imperceptibly. Full-disk encryption like BitLocker or FileVault is built into the operating system and uses dedicated chip features, so most users never notice a difference. The protection is well worth any tiny overhead.
What happens if we lose the encryption key or password?
If the key is truly lost, the data is generally unrecoverable — that is the point of strong encryption. This is why managing and backing up keys and recovery codes safely is essential. Losing the key can lock you out as completely as it locks out an attacker.
Find which compliance framework applies to you — free with Focus
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