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Speech and control message encryption in cellular radio - creates shared secret datum using bit string sent by provider, for encryption of speech and control signals
Patent Assignee: AMERICAN TELEPHONE & TELEGRAPH CO; AT & T BELL LAB
Inventor(s): REEDS J A; TREVENTI P A

**Patent Family**
Patent Number	Kind	Date	Week	Application Number	Date	Language	Pages	IPC
US 5172414	A	921215	9301	US 759312	910913		15	H04L-009/02
EP 532226	A2	930317	9311	EP 92307998	920903	Eng	17	H04L- 009/08
FI 9204092	A	930314	9324	FI 924092	920911			H04K- 001/06
EP 532226	A3	940413	9522	EP 92307998	920903			H04L- 009/02
JP 7303101	A	951114	9603	JP 92267809	920911		1	H04L- 009/00

Patent Application Number(s): US 759312(910913) ; EP 92307998(920903); FI 924092(920911); EP 92307998(920903); JP 92267809(920911)
Language: English

Cited Patents:

No-SR.Pub

1.Jnl.Ref

EP 105553 Y

EP 354770 Y

WO 8400656 A

Abstract: US 5172414 A

The protocol for authenticating a mobile custoemr unit to a service provider where signaling messages are encrypted and where voice communications can be encrypted. A service provider assigns to each mobile customer unit a unique ''secret'', along with other information such as a telephone number. At the pleasure of the service provider, a directive is sent to the mobile customer unit to create a shared secret datum based on the secret.

The shared secret datum is created with the aid of a bit string that is sent for that purpose by the provider. A portion of the created shared secret datum is used for encrypting speech and the same or other portion of the created shared secret datum is used as an input to a process for creating a second encryption key. That key is employed in the mobile customer unit to encode those of the control signals generated by the mobile customer until that effect the nature of the call in progress.

ADVANTAGE - Base stations do not have access to secret in mobile unit. Dwg.10/11

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