Appeal No. 2006-3120
Application No. 09/944,695
secure transmission protocol (e.g., Secure Sockets Layer (SSL) or Transport
Layer Security (TLS)). Upon receipt, the print node:
(1) generates a unique symmetric encryption key;
(2) encrypts the data with the symmetric key;
(3) encrypts the symmetric key with the print node’s public key; and
(4) stores the encrypted data.
[Mazzagatte, Fig. 5, steps S502-505; emphasis added].
The remainder of the process varies depending on whether the print node
is (1) an image forming device (i.e., a printer), or (2) a gateway to multiple image
forming devices. If the print node is a printer, then the process detailed in the
embodiment of Fig. 6 applies. Otherwise, the embodiments of Figs. 7A, 7B, or 8
apply [see Mazzagatte, col. 3, lines 22-40; col. 9, lines 35-40].
We turn our attention first to Fig. 7A (print node is a gateway). In that
embodiment, after authenticating the intended recipient, the print node:
(1) obtains the encrypted symmetric key;
(2) retrieves the encrypted print data;
(3) decrypts the symmetric key with its private key;1
(4) transmits the encrypted print data and decrypted symmetric key to the
printer via secure transmission protocol;
Following these steps, the printer:
(1) decrypts the print data with the symmetric key; and
1 Although this step is not specifically shown in the flowchart in Fig. 7A, it is described in col. 11,
lines 17-22.
8
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