High strength end-to-end encryption with perfect forward secrecy for your favorite email, plus real-time secure chat

Latest Version

Version
1.2.13
Update
March 23, 2023
Size
135KiB
Developer
passlok.com
Category
Users
29
Rating
3 ★
Manifest Version
3
Web Store Status
Languages Support
English (United States)
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Permissions
Storage
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SeeOnce Privacy Extension

SeeOnce encrypts your email messages so they self-destruct after the recipient has read them. It does this without involving any servers or forcing you to make an account anywhere. You can keep using your preferred email.

All other apps and extensions store your private content somewhere. SeeOnce does not do this; instead, it achieves forward secrecy by changing encryption keys with every message. This way, you don't have to trust anybody.

When you get a locked message, just paste it into the extension and it will open automatically. Then you can reply directly from within the extension.

Your friends don't need to have this extension. Messages open in a webpage just by clicking them. They can do this on an Android smartphone if necessary.

Some people live in places where using encryption is itself compromising. This is why the extension can disguise its output so it looks like normal text. Just supply a sufficiently long cover text after the message is locked. Disguised messages also unlock as soon as you paste them in.

If you find yourself exchanging a lot of emails, SeeOnce allows you to switch to real-time chat, which can involve text, files, audio, or even video. Just click the Chat button to make a secure invitation that only your correspondent can open, and then only once.

Comprehensive help is just one click away.

The extension uses 255-bit standard elliptic curves, which have been vetted against weaknesses by experts. On top of that, it uses 256-bit XSalsa20 encryption and 512-bit hash functions to complete the locking process. XSalsa20 is a high-performance, open source cipher, which has been scrutinized by experts for nearly a decade without any practical weaknesses being found.

This is the Chrome extension version of SeeOnce, essentially identical to the web version, except that it syncs its data seamlessly between machines.

The following is to check the authenticity of the web version:

Current version is: 1.2.12
Main source: https://PassLok.com/SeeOnce
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "name": "SeeOnce Privacy", "short_name": "SeeOnce", "description": "High strength end-to-end encryption with perfect forward secrecy for your favorite email, plus real-time secure chat", "version": "1.2.13", "manifest_version": 3, "icons": { "16": "seeonce-icon16.png", "48": "seeonce-icon48.png", "128": "seeonce-icon128.png" }, "content_security_policy": { "extension_pages": "default-src 'self'; img-src 'self' data:; style-src 'self'" }, "permissions": [ "storage" ], "background": { "service_worker": "background.js" }, "action": { "default_icon": { "16": "seeonce-icon16gray.png", "48": "seeonce-icon48gray.png" }, "default_title": "SeeOnce Privacy" }}
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How to download and manually install SeeOnce Privacy extension for Chrome

Looking for a way to install SeeOnce Privacy extensions for Chrome, you can search for them in the Chrome Web Store, clicking the "Add to Chrome" button, and following the straightforward process.

However, you may need to install SeeOnce Privacy extensions manually, this article outlines two simple methods to effortlessly install SeeOnce Privacy extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download SeeOnce Privacy extension and manually install through Drag &Drop

If you ever need to manually install a SeeOnce Privacy extension for Chrome, don't worry, it's a simple process. Just follow these easy steps, and you will have your extension ready to use in no time.

Step 1: Download the SeeOnce Privacy Extension by clicking the "Download CRX" button on the website.

Look for the SeeOnce Privacy extension you wish to install. Go to the website and download the SeeOnce Privacy extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for SeeOnce Privacy extension that contains all the data.

Step 2: Extract &Arrange Files

Once the file is downloaded, extract that file into its own folder. Similarly, give that extension files a permanent home. In other words, keep it in a folder that you don't accidentally delete it because these files will be needed to make that extension work.

Step 3: Go to the Chrome Extensions Page

Open Google Chrome and in the address bar, type chrome://extensions; it will open the Google Chrome extensions page. Make sure that "My extensions" is selected in the sidebar.

Step 4: Drag and Drop the Extension

Now, go to the folder where you extracted the SeeOnce Privacy extension and drag &drop the extension file from there anywhere onto the extension page within Google Chrome.

Step 5: Complete the Installation

Once you drag and drop the extension file, follow the steps that Google Chrome takes you through. Similarly, if the extension file is of .crx file format, you will be required to review the permissions and then add the extension.

Now, you can manage that added extension as you would like to with any other Chrome extension that you added through Chrome Webstore. Its icon will also appear in the Google Chrome Menu on the right side of the address bar once you activate it.

Method 2: Download SeeOnce Privacy extension for Chrome and install in Developer Mode

This is another method to install SeeOnce Privacy extension manually, but the twist is that here, you install by enabling the developer mode option provided in Google Chrome. This mode is commonly used for testing extensions or running unpublished tools.

Step 1: Download the SeeOnce Privacy extension file

Select and download the SeeOnce Privacy extension by clicking the 'Download CRX' button on the website.

Step 2: Extract the downloaded contents

Convert the file to a ZIP file if it is in CRX format then extract the SeeOnce Privacy extension zip file or folder that you downloaded. Make sure you extract it using the same folder name and keep it safely in another folder, so you don't delete it by mistake. The extracted folder will be needed to keep your SeeOnce Privacy extension running.

Step 3: Open Chrome Extension Setting Page

In the address bar of Google Chrome, type chrome://extensions and open the Chrome Extension Page.

Step 4: Enable Developer Mode

After opening the Chrome Extension page, look at the top right side, and you will find the toggle option of "Developer mode."Simply enable that developer mode option.

Step 5: Load the Unpacked Extension

Once you enable the developer mode option, you will see the menu of Load Unpacked, Pack Extensions and Update. From that, select the option "Load unpacked."

Step 6: Select the Extension Folder

Once the pop-up opens upon clicking Load unpacked, select the SeeOnce Privacy extension directory and click on the "Select Folder "button.

Step 7: Confirm and Install

After you select an extension folder of a Google Chrome extension you're installing manually, confirm its installation for the final time and let the installation complete.

Conclusion

Here we've made a step-by-step guide on How to manually install SeeOnce Privacy extension in 2 ways. We hope this guide proves helpful.

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