Quantum-proof encryption for any email, plus Passwords.
Users
9
−3 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#201K
#168K among extensions
Version
1.0.3
updated 29 May 2026
Users
monthly, 2 years
Latest, 15 Oct 2026:9 usersMove the mouse over the chart for any month
Ratings count
monthly, 2 years
Latest, 15 Oct 2026:0 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About KyberLock Universal
⚠️ NOTICE: KYBERLOCK UNIVERSAL HAS EVOLVED INTO PRIVACY BAR ⚠️
This legacy "Universal" extension is no longer actively updated for new web page layouts. To get the latest post-quantum security, cross-platform compatibility, and seamless real-time page interactions, please install our flagship Chrome Extension: Privacy Bar.
Privacy Bar contains the exact same serverless, post-quantum Crystals-Kyber encryption and SynthPass password management engines you trust, but features a massively upgraded, actively maintained interface that integrates effortlessly into your favorite webmail and texting apps.
👉 Search the Chrome Web Store for "Privacy Bar" or visit privacybar.net to upgrade.
ORIGINAL DESCRIPTION (LEGACY):
TAKE PRIVACY INTO YOUR OWN HANDS, NOW RESISTANT TO QUANTUM ATTACK
Easy, end-to-end secure encryption for email and other web-based communication systems, plus real-time chat, that does not rely on servers and is therefore immune to hacking or government intervention. Very similar to PassLok Universal, also in this store, except that it is built on the recently standardized Crystals-Kyber engine for encryption resistant to quantum computers.
KyberLock Universal is also a full-fledged password manager which, unlike most other managers out there, does NOT involve a server, yet it syncs between computers. Its password management engine is that of SynthPass, also in this store.
And if you're not exchanging messages or filling passwords, clicking the KyberLock Universal icon will allow you to save secure notes on any website, or to load it into a special "Incognito" page that loads within the normal Chrome window. This function, also available via the right-click menu, is borrowed from Page Cage, also in this store.
--KyberLock Universal is incredibly easy to use--
To encrypt a message or file, just click the KyberLock icon when the email service's Compose or Reply window is visible. A popup will take your private message and encrypt it with the click of a button. Then you can send it out like any other message, or as an attachment.
To decrypt it, display the encrypted message and click the KyberLock icon. A popup will show the decrypted message or file immediately, if there is one.
KyberLock asks you for your secret Key only once. It can be anything you want, so you can actually remember it. KyberLock will evaluate its strength and compensate for its weakness by lengthening the computations. It won't be stored or sent anywhere, and KyberLock will forget it after five minutes of inactivity.
If you want to change your secret Key, go ahead and start using a new one when KyberLock asks you for it. You may be asked for the old secret Key if KyberLock can't decrypt something, but otherwise that's all you'll have to do.
--Lots of power in a slender package--
You can use either of these five encryption modes, by just clicking a button:
1. Signed mode: encrypted messages can be decrypted again, so long as the recipients supply their authentic passwords. Recipients are also assured that the message was encrypted by the sender.
2. Read-once mode: after a few encrypted messages have been exchanged they can no longer be decrypted by anyone, even if they supply the correct passwords.
3. Chat mode: you can make invitations which, when decrypted by the recipients, open a webRTC real-time chat session where participants are directly connected to one another. The chat session includes text, files, audio, and even video.
4. Anonymous mode: for when you are using a dummy email account or otherwise do not wish to reveal your identity.
5. Shared password mode: most secure when you have previously shared a secret with the recipients
KyberLock Universal allows you to encrypt files and images as well. Just load them with a toolbar button. You can also encrypt them separately and load them as regular attachments.
For the very paranoid (and who isn't these days?), KyberLock Universal includes four special features:
1. Encrypt to image: the message is encrypted into an image you supply and then attach to your email, so the presence of a hidden message cannot be detected even by computer analysis.
2. Concealed mode: the encrypted message does not look encrypted, but actually looks like normal text. KyberLock still detects it and decrypts it normally, though.
3. Invisible mode: the encrypted material cannot be seen at all. It is hidden in the space between the lines of an otherwise normal message.
4. Hidden message: there is a hidden message in addition to the regular message, and it is encrypted by a separate key. The hidden message is completely undetectable to those who don't know it exists. Images also can contain hidden messages.
--State-of-the art security--
KylerLock is based on Crystals-Kyber, the recent winner of a six-year international competition for the best encryption engine that is resistant to attack by quantum computers. On top of that, it uses the 256-bit XChaCha20 symmetric cipher, a high-performance, open source algorithm, which has been scrutinized by experts for nearly a decade without any practical weaknesses being found.
The image-encryption part of KyberLock, developed in-house but open-source, has recently been shown to be much harder to detect than F5, the champion steganography tool until now.
KyberLock does not use servers that might eventually compromise your private data. All encryption is done client-side. All data sent to the email server is encrypted, and they don't have the key that decrypts it.
With KyberLock, you can actually SEE that that your messages have been encrypted. You can also see the code. KyberLock hides nothing from you.
--KyberLock Universal may be the only password manager you'll ever use--
It's a different kind of password manager: it is a password synthesizer.
With KyberLock Universal, there is no "vault" that has to be protected from hackers because your passwords are synthesized on the fly, just as you need them. KyberLock-made …
Growth
Window
Users
Change
Ratings
Rating
7 days
+1
+12.5%
0
0.00
30 days
−3
−25.0%
0
0.00
6 months
−2
−18.2%
0
0.00
1 year
−7
−43.8%
0
0.00
Chrome Web Store search rankings
Where KyberLock Universal appears when people search the store, with the 30 day change