Write your personal or shared Key, or the recipient's or signer's Lock in box 1. To display the characters, check Show. As you type your Key, a text below will tell you the strength of the Key based on simple rules. Make sure to use $ymbol$, numb3rs, caPiTals, unusual words and mispelingss. Initial capitals and trailing numbers are not helpful and will be ignored for the strength score. It is strongly encouraged to append your email to the Key. The strength meter won't show a Perfect score otherwise.

You will need to enter a Key to unlock or stamp messages. To send a short locked message, leave this box empty.

To display the Lock matching a Key, place the Key in box 1, click the Make Lock button. The Lock will appear in box 2. You can then email it by clicking Email.

To make a shared Key from your personal Key and someone's Lock, place your Key in box 1 and the Lock in box 2, then click Make Lock.

To put a random Key in box 1 and its corresponding Lock in box 2, click Make Lock with box 1 empty.

This is where you write the text to be locked, stamped or unlocked. Locks matching the Key in box 1 also appear here. The process to make Locks and shared Keys is described above.

To lock a text, enter it into box 2 below. Write a shared Key or the recipient's Lock in box 1, depending on the type of locking you want. Then click the Lock/Unlock button. The locked text will appear in box 2, replacing the original text. You can then email it or text it using the buttons above box 2.

If box 1 is empty when you click Lock/Unlock, a prompt will ask for a Short Message Key (message length limited to 57 ASCII characters, non-ASCII characters use 6 spaces each, so avoid using accents, umlauts, etc.).

To unlock a locked text, place your personal or shared Key in box 1, with the locked text in box 2, then click Lock/Unlock. If you have the wrong item in box 1, a popup will tell you.

To stamp a text with your personal Key, first make sure your Key is in box 1 above, then enter into box 2 below the text to be signed and click Stamp/Verify. The Stamp will be appended to the text. This can also be emailed with the Email button.

To verify a stamped text, place the text carrying the Stamp at the end in box 2 below, and the signer's Lock in box 1 above, then click Stamp/Verify. A popup will say whether or not the Stamp is verified for this text and this signer.

The Email button places the contents of box 2 in a formatted email, using the default client. The SMS App button opens your default messaging app; you need to copy the message into the clipboard before clicking the button. The QR button makes a QR code of whatever is in box 2 and displays it at the bottom of this page. This is useful to exchange information between mobile devices. Be aware that smartphones have trouble reading codes longer than 500 characters. The ID button replaces the content of box 2 with its SHA256 hash. This is useful for authentication purposes.