Cryptical control method for personal communication
US5677954A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1995 |
| Grant date | Oct 14, 1997 |
| Priority date | — |
| Expiry date | Jan 12, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0866
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
When an incoming call corresponding to a communication number PID takes place in a switching station, the switching station retrieves user-intrinsic information UK and an incoming-communication registered terminal identification number SID and sends the communication number PID to a communication terminal. When the communication terminal replies, the switching station generates a random number R and sends it to the communication terminal. In addition, the switching station generates a cryptical key K=F (R, UK) corresponding to the user-intrinsic information UK and the random number R. The communication terminal generates a cryptical key K=F (R, UK) corresponding to the received random number R and the user-intrinsic information UK that is input by the user. The switching station and the communication terminal encrypt the communication information corresponding to the cryptical key K and decrypt received encrypted communication information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.