Abstract: Image forming systems and image forming methods are provided. According to one aspect of the present invention, an image forming system comprises: a host computer including: a memory device configured to store original data; and an interface configured to receive edits of the original data providing edit data; and an image forming device including: an input coupled with the host computer and configured to receive the original data and the edit data; a processor configured to process the original data prior to the image forming device receiving the edit data, and to process the edit data after the processing the original data; and an image engine configured to form an image corresponding to the processed original data and the processed edit data.

Abstract: An encryption security system for printer client/printer communications that reduces or eliminates the risk of replay attacks. The validity of a secure print job is determined using a public/private key pair. The printer client encrypts print data using the public key of the public/private key pair or, preferably, a session key. If the print job is determined to be valid, the printer decrypts the print data and prints the data.