URSA Privacy

High strength symmetric encryption for your favorite email, plus real-time secure chat
What is URSA Privacy?
URSA Privacy is a Chrome extension called URSA Privacy that offers high strength symmetric encryption for your favorite email, as well as real-time secure chat. It allows you to encrypt text, images, and files with a secret key and provides options to encrypt into a cover image or disguise the output as normal text. URSA Privacy is fully compatible with PassLok Privacy, a larger sibling extension, and supports various encryption algorithms including XSalsa20, Pad, and Human.

Extension stats

Users: 13 ▲ 2
Version: 4.2.13 (Last updated: 2023-03-26)
Creation date: 2020-05-15
Risk impact: Very low risk impact
Risk likelihood: Low risk likelihood
Manifest version: 3
Size: 155.65K

Other platforms

Not available on Firefox
Not available on Edge
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Extension summary

URSA sits near your tray bar to provide secure and easy symmetric encryption of text, images, and files. This is the process:

  1. Click the bear icon to load URSA into a new tab.
  2. Type the secret key into the top box. The recipient must know this key.
  3. Type your message, possibly containing rich formatting, images, and even files into the large box, then click Encrypt.

The recipient will decrypt the encrypted message, which can be sent by email or some other means without fear of its being decrypted, by typing the same key, pasting the encrypted message, and clicking Decrypt.

If you feel really paranoid, URSA can encrypt into a cover image, so that it cannot be detected that anything is there. The image looks the same after the secret data have been injected.

URSA can also disguise its output so it appears to be normal text.

If you find yourself exchanging frequent messages with someone, you can switch into real-time chat, which can include text, files, audio, and even video!

URSA's main encryption algorithm is XSalsa20, included within the NaCl encryption library. This algorithm has extensively been vetted by experts for over ten years without flaws being found. There are also two experimental algorithms: Pad, which uses a large piece of text (from a book, or a webpage) as key and is theoretically unbreakable, and Human, which can be performed by hand if necessary.

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Extension safety

Risk impact

URSA Privacy does not require any sensitive permissions.

Risk likelihood

URSA Privacy has earned a fairly good reputation and likely can be trusted.

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Promo images

URSA Privacy small promo image
Small promo image

Similar extensions

Here are some Chrome extensions that are similar to URSA Privacy: