| US 7,457,954 B2 | ||
| Communications system and packet structure | ||
| Kenichi Wakiyama, Kariya (Japan) | ||
| Assigned to Denso Corporation, Kariya (Japan) | ||
| Filed on May 25, 2004, as Appl. No. 10/852,190. | ||
| Claims priority of application No. 2003-173851 (JP), filed on Jun. 18, 2003; and application No. 2003-407832 (JP), filed on Dec. 05, 2003. | ||
| Prior Publication US 2005/0010759 A1, Jan. 13, 2005 | ||
| Int. Cl. H04L 1/00 (2006.01) | ||
| U.S. Cl. 713—170 | 24 Claims |
| 8. A communications system comprising:
a transmitter configured to transmit a packet having a packet structure, the packet being one of plurality of packets message
data while stowing flint information used for authentication; and
a receiver configured to receive the packet transmitted by the transmitter while storing second Information being Identical
to the first Information for authentication, wherein
the packet structure contains data region including:
transmission object data that is one of division portions into which the message data is divided so that each of the division
portions is contained within the packet;
authentication information which is used for executing substitution detection to the transmission object data and is designated
from the stored first information that is independent of the transmission object data; and
control information that at least indicates what kind of a constituent of the message data the transmission object data is,
wherein in the transmitter, the authentication information is designated from the first information such that a data length
of the authentication information is a difference resulting from subtraction of both (i) a data length of the transmission
object data and (ii) a data length of the control information from a data length of the data region.
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