• PixelKnot: Hidden Messages 1
  • PixelKnot: Hidden Messages 2
  • PixelKnot: Hidden Messages 3
  • PixelKnot: Hidden Messages 4

PixelKnot: Hidden Messages

Have a secret that you want to share? Why not hide it in a picture? With PixelKnot, only your friends with the secret password can unlock your special message. Everyone else just sees a pretty picture. It’s a fun and easy way to share hidden messages without anyone knowing. Take those pixels, twist them in a knot, and see for yourself!

★ DISGUISE YOUR MESSAGES: Pictures are public, the text is hidden inside. Even a trained eye will think the image is unedited. It’s security through obscurity!
★ FOR YOUR EYES ONLY: Put a password on the secret message to make sure that no one can read it except the person it’s meant for.
★ EASY IMAGE CHOOSER:  You can use the camera to take photos, or just use photos you’ve already taken.
★ INVISIBLE CHANGES: Even a trained analyst analyst shouldn’t be able to detect any message. The image bytes should seem undistorted.
★ SHARE ACROSS PLATFORMS: Want to share the images over email, file sharing tools (like Dropbox & Sparkleshare), social media (like Google+ & Flickr) or directly through Bluetooth or NFC? Not a problem! The messages are still recoverable on the other side. We'll have even more tools (like Facebook) working soon, so stay tuned!
★ AD-FREE: We want your love, not your money.
★ MATHEMATICALLY SECURE: We use the newly developed steganography algorithm F5 which implements matrix encoding to improve the efficiency of embedding and employs permutative straddling to uniformly spread out the changes over the whole steganogram.
★ ATTACK RESISTANT: We’ve launched attacks on images with messages hidden in them using a specialized version of stegdetect, an automated tool for detecting steganographic content in images. In most cases, the pictures have been impervious to attack. We will be including detection in an upcoming version of the application so you can easily test it yourself!Don’t see your language? Join us and help translate the app: https://www.transifex.com/projects/p/pixelknot/

***Learn More***
★ ABOUT US: Guardian Project is a group of developers that make secure mobile apps and open-source code for a better tomorrow.
★ OUR WEBSITE: https://GuardianProject.info.
★ ON TWITTER: https://twitter.com/guardianproject
★ OPEN-SOURCE: PixelKnot is free software. You can take a look at our source code, or join the community to help make it even better: https://github.com/guardianproject/pixelknot
★ MESSAGE US: Are we missing your favorite feature? Found an annoying bug? Please tell us! We’d love to hear from you. Send us an email: [email protected]

***Disclaimer***The Guardian Project makes apps that are designed to protect your security and anonymity. The protocols that we use are widely regarded as the state of the art in security technology. While we are constantly upgrading our software to combat the latest threats and eliminate bugs, no technology is 100% foolproof. For maximum security and anonymity users must utilize best practices to keep themselves safe. PixelKnot is still an experimental application and should not be used in real world deployments. You can find a good introductory guide to these topics at https://securityinabox.org

Category : Communication

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Reviews (27)

Ken. S. Dec 4, 2018     

Be careful. I tested by choosing a photo, writing message and sending to myself. The email came with a different photo from my gallery. It was not next to or remotely similar to the photo I put the test message on. Imagine if a personal photo went to whomever you were sending the secret message to. Scary. Also, since first test and then second test the darn app won't work. Also tried retrieving messages from photos with no message or with wrong password and it just spins. Should give a message like no message detected or incorrect password.

Sha. B. Aug 3, 2020     

Horrible doesn't work. Let's you type a message set a password and then it does to hide the message gets to 8% and closes. Ive tried it 20 times over the past two days and thats all it does

Max. M. Sep 15, 2021     

Keeps crashing at 8% when loading message into picture i picked. Have uninstalled and reinstalled but still crashing at exactly same place everytime. I have had this app few yrs ago on different android phone. I want this app pls fix asap!

Eri. C. Dec 3, 2021     

Currently crashes at 8%. Please please please maintain your apps. I would love to see this app function again.

Vir. K. May 3, 2020     

Worked great... then all of a sudden crashes after entering the text and pw when sending message... no updates in years. Are the developers even paying attention?

Rip. P. Feb 23, 2021     

Force closes after you input your message while app tries to hide message @8% complete. It doesn't even show 1-7% and forces closes at 8%. Galaxy J7 crown: hardware version: S767VL.04 model number: SM-S767VL

And. A. Feb 7, 2019     

great concept but app is broken crashes every time and I've been unable to use it so far would love to see a working version

Jam. B. Feb 19, 2022     

Great idea for an app, got mine via Nethunter app. Although I can't get it to work on my main phone, or any other of my phones either :(

Mik. S. Jan 3, 2020     

It looks like this app has been abandoned. No update for nearly 3 years. It should be considered unsafe for its intended purpose. It's a shame really, it was good when it worked.

Ber. Mar 18, 2019     

Completely useless, as the app always crashes when trying to export anything.

Pet. Oct 22, 2018     

Tried twice, each time the app shut down at the 8 second mark. Nice concept, poor coding

mar. Apr 18, 2020     

Crashes constantly when attempting to process text into picture. Pity.

Aha. E. Oct 3, 2020     

this is a stupid app that keep crashing all the time I recommend not to download its spending time on it !!

Cha. M. V. May 14, 2020     

It's not working 😟, it have some bugs and crashes many time please try to repair as soon as possible

Gee. R. May 3, 2019     

Works kust as described! will there be an opportunity to open messages from app nit through file managers "open with" function? Is this app still supported?

Sou. D. May 15, 2019     

It always crashes when instructed to work. Needs an update.

Geo. H. Apr 28, 2020     

Was working great until all the latest android updates. Now crashes constantly

Min. M. F. Sep 21, 2020     

Total garbage, doesn't work at all, and from what I see it was a failed project.

rob. c. Apr 17, 2019     

keeps crashing at 8% fix before uploading an app to play store that dont work please need better quilaty control

Atu. R. Apr 8, 2020     

Not working, choose photo,added message, added password,Nothing happened.

Col. D. Feb 27, 2021     

Doesn't work. Crashes at 8% every time.

Adh. M. Sep 21, 2019     

Not working. Crashing on starting the process

Mon. P. Feb 5, 2019     

when i set a messag then encoding, this app is continuously unfortunately stoped.

Bre. S. Nov 20, 2019     

App does not work. Crashes on LG Stylo 3.

Jos. Aug 5, 2021     

App crashes and doesn't work.

All. S. May 11, 2022     

Crashes at every turn.

Pra. D. Nov 12, 2021     

APP IS NOT WORKING PROPERLY, WHEN I CLICK AFTER GIVING PASSWORD, THE APP CRASHES