The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2002
Filed:
May. 29, 1998
Sony Corporation, Tokyo, JP;
Abstract
The present invention provides a data transmission apparatus which enhances the safety with respect to leakage of encoded transmitted data by raising the safety of transmission of an encoding key or a decoding key. It provides a large capacity transmission line such as a satellite transmission line for transmitting a large amount of data and a small capacity transmission line such as a public telephone line for transmitting an encoding key or decoding key or information for the generation of them. The encoding session key is generated by using a work key and a destination address of a receiving apparatus of the destination. Further, the decoding session key is generated using one's own address and the work key. The work key is preferably encoded and transmitted through the small capacity transmission line . In the transmitting apparatus , in addition to the encoding of the data which should be transmitted by using the encoding session converted as described above, transmission control information such as destination data is added and is transmitted to the receiving apparatus through the large capacity transmission line . In the receiving apparatus , the encoded data is decoded by using the decoding session key converted as described above.