Store encrypted todo list items at checkvist.com.This chrome extension allows you to encrypt and decrypt individual todo list items. If the todo list item is dark green, it's encrypted and has been decrypted.
Shortcuts:
ctrl + shift + [: Enter/change your password
ctrl + [ (inside an edit box): Decrypt text
ctrl + ] (inside an edit box): Encrypt text
Usage info:
If you are a heavy user of priorities, this will not work for you because it changes the color of encrypted messages.
This extension uses the excellent SJCL crypto library. It provides a very simple API for encryption and decryption with AES. http://crypto.stanford.edu/sjcl/
Disclaimer:
Not thoroughly tested. Let me know if you see anything break.
The password is stored in local storage.
Also, the server can still figure out what the plaintext is by running JavaScript to detect it on the page and send it back to the server, so don't rely on this in life or death situations.