Encryption > Glossary
Encryption glossary
A practical reference to the encryption, security, and privacy technologies powering the internet.
What is ciphertext?
Ciphertext is the scrambled, unreadable form your data takes after encryption. Find out how it’s created and why your online safety depends on it.
What is full-disk encryption?
What happens to your data if a device is stolen or seized? See how full-disk encryption locks down everything, from files to the operating system.
What is HTTPS?
HTTPS is the foundation of web security, but it has limits. Find out how it really protects you and why it’s only one part of staying safe online.
What is ChaCha20?
ChaCha20 is a fast encryption algorithm built for the modern internet. See why it rivals the AES cipher and why it’s trusted by browsers and VPNs alike.
What is perfect forward secrecy?
Does one breach expose all your past connections? Perfect forward secrecy prevents this by using new encryption keys for every session.
What is post-quantum encryption?
Quantum computers could break today's encryption, so what's going to happen to your data? See how post-quantum encryption gets ahead of that threat.
What are encryption backdoors?
Encryption backdoors promise “lawful access” but weaken security for everyone. See why a backdoor can’t let just the good guys in.
Privacy vs. security
Privacy and security are often mixed up, although they slightly overlap. Learn the difference and why you need both to stay safe online.
Take charge of your data
Proton was built to protect your data from the start. With end-to-end encryption, open-source apps, and independent audits, your information stays yours.
