Printer and print system, and data receiving device and data transmitting and receiving system - Patents

Printer and print system, and data receiving device and data transmitting and receiving system
United States Patent 7,552,324
Shima , et al. June 23, 2009
Inventors: Shima; Toshihiro (Nagano-Ken, JP), Gassho; Kazuhito (Nagano-Ken, JP), Kojima; Teruhito (Nagano-Ken, JP)
Assignee: Seiko Epson Corporation (Tokyo, JP)
Appl. No.: 10/512,235
Filed: July 22, 2003
PCT Filed: July 22, 2003
PCT No.: PCT/JP03/09280
371(c)(1),(2),(4) Date: October 22, 2004
PCT Pub. No.: WO2004/022350
PCT Pub. Date: March 18, 2004

Abstract
A printer generates a public key with a passphrase containing at least printer position information and a random number by a public key cryptography, and holds this random number. A print client previously acquires the public key from the printer. When transmitting print data to the printer, the print client encrypts the print data in advance with the acquired public key and transmits the encrypted print data as print transmitting data. The printer which has received the print transmitting data generates a private key with a passphrase containing at least printer position information and the held random number by the public key cryptography. The printer then decrypts the received print transmitting data with the private key. Consequently, the security of the print data transmitted from the print client to the printer via a network is ensured.