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Preview of PassLok Image Steganography

PassLok Image Steganography by F. Ruiz

The reigning champion of image steganography. Steganography is the art of hiding secrets in plain sight. This app implements an improved version of F5 algorithm in order to embed data into images without leaving any traces.

3 (2 reviews)3 (2 reviews)
16 Users16 Users
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To hide data:
1. Type or otherwise load the data to be hidden into the main box.
2. Load the image to be used as a cover.3. Type your Password (optional but strongly recommended, otherwise anyone will be able to extract the data). Also set the options.
4. Click "Hide into PNG" or "Hide into JPG" depending on desired output format.5. Right-click the image and save it.
6. Now you can send it or post it where you like. No one will be able to tell it contains hidden data.To extract the hidden data:
1. Load the image with the button.
2. Type the Password and set the options the same as for hiding.
3. Click the "Reveal" button.Presto!

If the process fails, no hint is given other than either there is nothing or the Password is incorrect.
About this extension
Steganography is the art of hiding secrets in plain sight. This app implements an improved version of A. Westfeld's F5 algorithm in order to embed text and other data into images without leaving any traces that might be detected, as presented before experts at the ForenSecure 2017 conference. It is the same stego algorithm implemented in PassLok Privacy, PassLok for Email, and URSA, also available in this store, but its output is not compatible with those because this app does not include the same encryption engine.

Processing is done completely within your browser, without contacting any outside machine or website. You can use the app with your network turned off, if you feel paranoid. Because it is an extension, the other extensions and addons installed on your browser are prevented from seeing what this app is doing. This includes any password managers you may have installed.

The images can be saved in the popular JPG format, or in PNG format, which can contain more hidden data. Then you can send them by email or upload it to a sharing site so your friends can get it. This can be very useful if you are under surveillance of live under a repressive regime. Please refrain from using the app if your intent is to engage in illegal activity.

For greatly enhanced security, please use a Password that you share with your friends. If no Password is used, anyone who has this app will be able to extract the data. Without knowing the Password, it will be very difficult even to know that there is anything hidden.

There is a Help screen that tells you how to use the app step by step, always just one click away.

For the super-paranoid, the app can hide a short second message, which requires a separate Password. It can only be retrieved if both Passwords are correct. Details are in the Help screen.

This is the process to hide data in an image:
1. Type, paste, or use the toolbar buttons to load text or data into the main box.
2. Load a cover image by clicking the "Load cover image" button.
3. Type a Password in the small box (you can omit it, but we strongly recommend that you don't).
4. Make sure the "Compress" and "Smart Pwd." options are selected the way you want them.
5. Click either the "Hide into PNG" or the "Hide into JPG" button.
6. When the process is complete, right-click the image and select "save image as..." in order to save it locally.

To reveal the hidden data:
1. Load the image by clicking the "Load cover image" button.
2. Type the Password, if any, in the small box. Must the the same one used for hiding the data.
3. Set the "Compress" and "Smart Pwd." options the same way they were set when the data was hidden.
4. Click the "Reveal" button. If successful the hidden data will appear in the main box.
Developer comments
This algorithm was presented at the ForenSecure 2017 conference on cybersecurity and forensics. The experts attending were not particularly happy after the talk, for their job of trying to detect hidden data had suddenly become quite a bit harder. One year later, I realized the general public might want to check out what it can do, hence this addon.

The GitHub page for this is https://github.com/fruiz500/PassLok-stego
Rated 3 by 2 reviewers
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Add-on Links
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Version
1.0.4
Size
116.08 KB
Last updated
2 years ago (Mar 23, 2023)
Related Categories
  • Privacy & Security
  • Photos, Music & Videos
  • Social & Communication
License
GNU General Public License v3.0 only
Version History
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Release notes for 1.0.4
Updated to Manifest v3.
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