Encrypted printing
AssigneeHewlett-Packard Development Company, L.P.
InventorBill Wagner
Life of this patent
Estimating the term…
Abstract
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.
Claims14
A printing apparatus comprising:
- a scanner to scan a print medium to generate analog scan data;
- an analog-to-digital converter coupled to the scanner to receive the analog scan data and convert the analog scan data to 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, wherein the encryptor is to encode an error detection and correction code into the sequence of the encrypted pixels;
- a data storage device to store the sequence of the encrypted pixels;
- and
- a printing subsystem to print the stored sequence of the encrypted pixels.
A method comprising:
- scanning, by a scanner, a print medium line-by-line to generate analog scan data;
- converting, by an analog to digital converter, the analog scan data to digital scan data;
- generating, by a pixelization circuit, a sequence of pixels from the digital scan data;
- encrypting, by an encryptor, the sequence of pixels into a sequence of encrypted pixels;
- encoding, by the encryptor, an error detection and correction code into the sequence of the encrypted pixels;
- buffering the sequence of the encrypted pixels into a data buffer to accumulate a swath of the encrypted pixels;
- and
- printing the swath of the encrypted pixels from the data buffer.
A printing apparatus comprising:
- a scanner to scan a print medium to generate analog scan data;
- an analog-to-digital converter coupled to the scanner to receive the analog scan data and convert the analog scan data to digital scan data;
- an encryption circuit coupled to the analog-to-digital converter to encrypt the digital scan data into encrypted digital scan data and encode an error detection and correction code into the encrypted digital scan data;
- a data buffer to temporarily store the encrypted digital scan data;
- and
- a printing subsystem coupled to the data buffer to print the stored encrypted digital scan data.
Dependencies are inferred from the claim text.