What is KyberLock?

KyberLock is a web app to encrypt, decrypt, and sign data using Crystals-Kyber, the recently standardized method for quantum-proof encryption. This means that quantum computers are not expected to ever being able to crack data encrypted with KyberLock, unlike data encrypted with today's methods. The app runs on any computer and any mobile platform.

KyberLock starts by asking me for a Key, and then for my email. Is it making an account somewhere?

Absolutely not. KyberLock does not talk to servers, so the Key and the email you are being asked to supply are for encrypting things locally. The email is optional and does not need to be your email, either. The email is stored locally, but the Key is never stored anywhere.

What is a Key?

A Key is a secret piece of text that allows you to decrypt items that have been rendered unreadable in KyberLock. There are two kinds of Keys: 

1. Secret Keys, which only one person knows and doesn't share with anyone. You need a secret Key to do most things.
2. Shared Keys, which two or more people know. They are optionally used to encrypt and decrypt messages and files.

A good Key contains lowercase letters as well as caPitals (not at the start), numb3rs (not at the start or the end, either), and $pecial characters. It is at least 12 characters long. If common words are used, they are misppelllled. It is not a piece of data that can be easily related to the user, such as a birthday or a piece of his/her national ID number.
KyberLock has a built-in process to evaluate Key strength, based on an English dictionary and a sophisticated measurement of information entropy. Please take the time to come up with a secret Key that KyberLock rates as Medium, Good, or even Great. KyberLock compensates for weak Keys by adding extra calculations, so if things seem slow, you can speed it up by choosing a better Key.

What is a Lock?

A Lock is a public (not secret) block of text that is used to encrypt data for someone else, so that nobody except the person who has the matching Key can decrypt it.
You can always make the Lock from the Key, but it is impossible to retrieve the Key starting from the Lock. This is what makes everything work.

II don't want my messages to look encrypted. Can KyberLock help with that?

KyberLock can disguise its output as apparently normal text, or hide it within images. You have five different ways to disguise as text, selectable from the Options tab. Image hiding can output in the png and jpg formats, and can incorporate a second hidden message under a separate Key.

How do I tell my friends about KyberLock, and give them my Lock so we can exchange encrypted data?

KyberLock has an Invite button which, when pressed, will make a special message containing your Lock and whatever was in the box before the click, insecurely encrypted. Then you can send that by email or some other means. Recipients will get your Lock automatically, plus the little message you wrote, which should not be anything really private. You'll still have to authenticate your Lock through a phone call or similar channel, by reading aloud the fingerprint displayed by the app along with your Lock.