What is Encryption?
Encryption scrambles data using a key so only authorized parties can read it, protecting information in transit and at rest.
Encryption is the process of scrambling data so that only someone with the right key can read it. It turns readable "plaintext" into unreadable "ciphertext," protecting information whether it's stored on disk or traveling across the internet.
How It Works:
- Take plaintext and an encryption key
- Run them through an algorithm to produce ciphertext
- Anyone without the key sees only gibberish
- The authorized party uses a key to decrypt back to plaintext
Two Main Types:
- Symmetric: The same key encrypts and decrypts (fast; e.g. AES)
- Asymmetric: A public key encrypts, a private key decrypts (great for key exchange; e.g. RSA)
Everyday Examples:
- HTTPS: Encrypts web traffic
- Messaging: End-to-end encryption in apps like Signal
- Disk encryption: Protects data if a device is stolen
- Password storage: Actually uses hashing, not encryption
FAQ
What's the difference between encryption and hashing?
Encryption is reversible with a key; hashing is one-way and can't be undone. Encryption protects readable data; hashing is used to verify integrity or store passwords.
What is end-to-end encryption?
It means only the sender and recipient can read the messages — not even the service provider in the middle. The data is encrypted on the sender's device and decrypted only on the recipient's.