Write your secret Key, the recipient's or signer's Lock, or a shared Combination in box 1. To display the characters, check Show. As you type, 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. You will need to enter your 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 Lock/Unlock button below. The Lock will appear in box 2. You can then email it by clicking Email.

To make a shared Combination from your Key and someone's Lock, place your Key in this box and the Lock in box 2, then click Lock/Unlock.

To put a random Key in box 1 and its corresponding Lock in box 2, click Random

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 Combinations is described above.

To lock a text, enter it into box 2 below. Write a shared Combination 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 msg 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 secret Key or the shared Combination 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 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/ID. 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/ID. A popup will say whether or not the stamp is verified for this text and this signer.

If there is nothing in box 1 when you click the Stamp/Verify/ID button, the contents of box 2 are replaced by its SHA256 hash. This is useful for authentication purposes.

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.