US Patent 11176434 Encrypted printing

A printing apparatus can print an encrypted document. The printing apparatus includes a scanner to scan a print medium, an analog-to-digital converter coupled to the scanner to convert analog scan data digital scan data, a hardware pixelization circuit to generate a sequence of pixels from the digital scan data, an encryptor to encrypt the sequence of pixels to generate a sequence of encrypted pixels prior to storing of the digital scan data, a data storage device to temporarily store the sequence of the encrypted pixels, and a printing subsystem to print the stored sequence of the encrypted pixels.