发明名称 |
METHOD AND APPARATUS FOR PROVIDING CRYPTOGRAPHIC PROTECTION OF A DATA STREAM IN A COMMUNICATION SYSTEM. |
摘要 |
<p>A method and apparatus for providing cryptographic protection of a data stream are described in accordance with the Open Systems Interconnection (OSI) model for a communication system. This cryptographic protection is accomplished on the transmitting side by assigning a packet sequence number to a packet derived from a data stream received from a network layer. Subsequently, a transmit overflow sequence number is updated as a function of the packet sequence number. Then, prior to communicating the packet and the packet sequence number on a physical layer, the packet is encrypted as a function of the packet sequence number and the transmit overflow sequence number. On the receiving side, the packet sequence number is extracted from the physical layer. In addition, a receive overflow sequence number is updated as a function of the packet sequence number. Finally, the encrypted packet is decrypted as a function of the packet sequence number and the receive overflow sequence number. In addition, a transmitting and a receiving communication unit for use in a communication system which includes cryptographic protection of a data stream is described.</p> |
申请公布号 |
EP0671092(A4) |
申请公布日期 |
1995.12.13 |
申请号 |
EP19940922507 |
申请日期 |
1994.07.11 |
申请人 |
MOTOROLA, INC. |
发明人 |
FINKELSTEIN, LOUIS, D.;KOSMACH, JAMES, J.;SMOLINSKE, JEFFREY, CHARLES |
分类号 |
H04H20/00;H04L1/16;H04L9/16;H04L9/18;H04L29/06;H04Q7/38;(IPC1-7):H04L9/28 |
主分类号 |
H04H20/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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