公开(公告)号：US20020091640A1

公开(公告)日：2002-07-11

申请号：US10052363

申请日：2002-01-18

Applicant: HEWLETT-PACKARD COMPANY

Inventor： Dipankar Gupta

IPC: G06F017/60

CPC classification number: H04N1/32771 ,  G06Q20/382 ,  G06Q20/3829 ,  H04L9/085 ,  H04L2209/56 ,  H04L2209/605 ,  H04N1/34 ,  H04N1/44 ,  H04N1/4406 ,  H04N1/444 ,  H04N1/4486

Abstract: A document transfer system enabling a consumer to obtain a document from an owner upon payment uses a cryptographic protocol involving the consumer, the owner, a document source, such as a printer, and a mediator, the protocol comprising the following steps: (a) the consumer requests a document; (b) the owner provides the source with first and third portions of the key and provides the mediator with a fourth portion of the key, which can combine with said first portion to generate the complete key; (c) the consumer provides the owner with the payment; and (d) the owner provides the source with a second portion of the key, which can combine with said first portion to generate the complete key. A printer 1 for use in the above system comprises a document memory 2 for storing a received encrypted document, a key memory 3 for storing a first cryptographic key portion, a processor 4 for receiving a second cryptographic key portion and combining it with the first key portion to form a complete cryptographic key which is supplied to a decrypting module 5. The encrypted document is supplied to the decrypting module 5 whereupon the document is decrypted and supplied to the consumer.

Abstract translation: 支付消费者能够从所有者获得文档的文档传送系统使用涉及消费者，所有者，诸如打印机和媒介的文档来源的密码协议，该协议包括以下步骤：（a） 消费者要求一个文件; （b）所有者向所述源提供所述密钥的第一和第三部分，并向所述调解者提供所述密钥的第四部分，所述第四部分可以与所述第一部分组合以产生完整的密钥; （c）消费者向业主提供付款; 和（d）所有者向所述源提供所述密钥的第二部分，所述第二部分可以与所述第一部分组合以产生完整的密钥。 用于上述系统的打印机1包括用于存储接收到的加密文件的文件存储器2，用于存储第一加密密钥部分的密钥存储器3，用于接收第二加密密钥部分的处理器4，并将其与第一密钥 部分以形成提供给解密模块5的完整加密密钥。加密的文档被提供给解密模块5，从而将文档解密并提供给消费者。