Vernam Cipher was a tools app developed by Jeff Isaak. It was removed from Google Play May 11, 2025 and is no longer available for download.
Download Statistics
Vernam Cipher had been downloaded 2.7 thousand times before it became unavailable.
User Ratings
The app had no ratings.
App Information
Vernam Cipher was free to download. The APK download size was 3.41 MB. The last available version was 1.15. The last update was on March 6, 2020.
Technical Requirements
Vernam Cipher required Android 4.1+ or higher. The app had a content rating of Everyone. The app had been available on Google Play November 2016.
Description
Using this app, you can create and share secret keys that you can then use to encrypt and decrypt messages using the Vernam Cipher. This implementation acts as a one time pad as it discards the part of the key used to encrypt/decrypt messages.
Source code is available at https://github.com/jeffisaak/vernam_cipher
Changelog (from v1.1 onwards):
Version 1.10 - Upgraded Android SDK and Gradle versions. - Updated the 'about' text.
Version 1.9: - Fixed a couple of bugs that were causing crashes
Version 1.8 - Added a message to the user indicating their password protected secret keys are broken (terribly sorry everyone)
Version 1.7 - Fixed a bug that was causing secret key importing to fail. - Fixed a bug that was causing password-protected secret keys to fail.
Version 1.6 - Fixed a bug that was causing the number of bytes remaining in a password-protected secret key to be misrepresented - Added the display of the cipher text when decrypting a message. - Added the ability to view a secret key (long press on a secret key in the list, then select 'View secret key').
Verison 1.5 - Fixed a bug that caused the app to crash when decryption was attempted with no secret keys generated
Version 1.4 - Fixed a bug that caused the app to crash on startup for new installations
Version 1.3 - Added ability to share encrypted messages as text or as a file - this opens up new sharing options - Miscellaneous code cleanup - Added a link to my donation page (yes, shameless self-promotion)
Version 1.2 - Fixed an error connecting to random.org
Version 1.1 - Fixed a rather crippling Nougat bug - Expanded the error message when random.org data fetching fails
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★★★★★
Excellent app, happy to find a recently updated one time pad encryption app. Edit** I have received the update and being able to send via text solves the problem I had of not being able to choose the appropriate app, the app was installed, but it still wouldn't list when trying to send via file. Excellent project, I appreciate the reply with regards to the request, thank you!
★★★★★
Great app but if the message is longer than a screen it doesn't show the entire text message (no scroll bar). It would also be great if a user could create their own pad and insert.
★★☆☆☆
Used it to send memes ("Get stick bugged") to friends; kept crashing after two or three sent messages. Shame, was fun to use.
Technologies used by Vernam Cipher
Vernam Cipher is requesting 3 permissions and is using 9 libraries.
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
Android Jetpack core
Volley
Material Dialogs
MaterialProgressBar
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