Cipher QR Codes

This page shows the use of the encrypt() and decrypt() functions of the Web Crypto API. It contains a quantum-resistant encryption algorithm:

• "AES-GCM-256"

Description:

• QR code works only on short message.
• Cipher, key, IV are in Base16 for human readability.
• A text box containing a message to encrypt.
• A representation of the ciphertext.
• A box that will contain the decrypted ciphertext.
• An "Encrypt" button: this encrypts the text box content.
• A "Decrypt" button: this decrypts the "Ciphertext" and writes the result into the "Short message" box.

Try it:

• Press "Encrypt". The ciphertext should appear.
• Press "Decrypt". The decrypted text should appear, and match the original message.
• Press "New". The new key and IV should appear.
• Edit the text box contents.
• Press "Encrypt" again. A different ciphertext should appear.
• Press "Decrypt" again. The content should appear next to "Short Message:".

For real world application:

• Save complete web page to local storage of the device.
• Test to make sure this web page works offline on the device.
• Do not connect the device online ever again after the device was being used to encrypt/decrypt confidential message.
• Scan/photo/print QR codes on different devices. If transceiving via network, communicate untraceably on all endpoints.
• Do not transceive ciper and key or iv QR Codes using the same media.

Changes History