StatiCrypt
Based on the crypto-js library, StatiCrypt uses AES-256 to encrypt your string with your passphrase in your browser (client side).
Download your encrypted string in a HTML page with a password prompt you can upload anywhere (see example).
You can encrypt a file online at https://robinmoisson.github.io/staticrypt.
HOW IT WORKS
Disclaimer if you have extra sensitive banking data you should probably use something else!
StatiCrypt generates a static, password protected page that can be decrypted in-browser: just send or upload the generated page to a place serving static content (github pages, for example) and you're done: the javascript will prompt users for password, decrypt the page and load your HTML.
It basically encrypts your page and puts everything with a user-friendly way to use a password in the new file.
AES-256 is state of the art but brute-force/dictionary attacks would be trivial to do at a really fast pace: use a long, unusual passphrase.
The concept is simple but I am not a cryptographer, feel free to contribute or report any thought to the GitHub project! (Though be warned it might take me a long time to get to it - I apologize in advance)
Similar project: MaxLaumeister/clientside-html-password
CLI
Staticrypt is available through npm as a CLI, install with npm install -g staticrypt and use as follow:
Usage: staticrypt <filename> <passphrase> [options]
Options:
--help Show help [boolean]
--version Show version number [boolean]
-e, --embed Whether or not to embed crypto-js in the page (or use an
external CDN) [boolean] [default: true]
-o, --output File name / path for generated encrypted file
[string] [default: null]
-t, --title Title for output HTML page
[string] [default: "Protected Page"]
-i, --instructions Special instructions to display to the user.
[string] [default: null]
-f, --file-template Path to custom HTML template with password prompt.
[string] [default: "[...]/cli/password_template.html"]
Example usages:
staticrypt test.html mysecretpassword-> creates atest_encrypted.htmlfilefind . -type f -name "*.html" -exec staticrypt {} mypassword \;-> create encrypted files for all HTML files in your directory
You can use a custom template for the password prompt - just copy cli/password_template.html and modify it to suit your presentation style and point to your template file with the -f flag. Be careful to not break the encrypting javascript part, the variables replaced by staticrypt are between curly brackets: {instructions}.
ADBLOCKERS: If you do not embed crypto-js and serve it from a CDN, some adblockers see the crypto-js.min.js, think that's a crypto miner and block it.
Thanks Aaron Coplan for bringing the CLI to life!