JP2893775B2 - Key management method for cryptographic communication system for mobile communication - Google Patents
Key management method for cryptographic communication system for mobile communicationInfo
- Publication number
- JP2893775B2 JP2893775B2 JP1340401A JP34040189A JP2893775B2 JP 2893775 B2 JP2893775 B2 JP 2893775B2 JP 1340401 A JP1340401 A JP 1340401A JP 34040189 A JP34040189 A JP 34040189A JP 2893775 B2 JP2893775 B2 JP 2893775B2
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- Prior art keywords
- key
- station
- base station
- communication
- mobile station
- Prior art date
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Description
【発明の詳細な説明】 〔概要〕 センタ交換局，基地局及び移動機からなる移動通信シ
ステムにおいて，基地局と移動機間の暗号通信を行う
際，ダイナミックに移動する移動機に追従し，無線ゾー
ン内にある移動機の該当基地局へ適切な移動機通信鍵を
安全に送る鍵管理方式に関し、通信システム全体の安全
性を、装置の大型化をせずに図ることを目的とし、セン
タ交換局，基地局及び移動機からなる移動通信システム
において，前記センタ変換局に，前記移動機，前記基地
局の認証を行い，前記移動機と前記基地局間の暗号通信
に必要な鍵を判定し，該当する移動機の鍵配送を指示す
る手段と，前記センタ交換局側に格納されているセンタ
側マスタ鍵で暗号化した各基地局のマスタ鍵及び各移動
機の通信鍵を，前記センタ交換局の指示により、センタ
交換局側のセキュリティモジュール内でセンタ局マスタ
鍵を使って一度復号し，該当する基地局のマスタ鍵及び
移動機の通信鍵を得て，基地局マスタ鍵で該当基地局に
ある移動機の通信鍵を暗号化して，該当基地局へ送る手
段とを備え、前記基地局側には、送られてきた前記基地
局の鍵で暗号化した移動機の鍵を前記基地局側のセキュ
リティモジュール内で基地局マスタ鍵で復号し，移動機
の通信鍵を得て，この鍵で基地局と移動機間の通信を暗
号化する手段を備え，前記基地局と前記移動機間の暗号
通信を行う際，移動する前記移動機に追従し、無線ゾー
ン内にある前記移動機の該当基地局へ適切な移動機通信
鍵を配送するものである。DETAILED DESCRIPTION OF THE INVENTION [Overview] In a mobile communication system including a center switching center, a base station, and a mobile station, when performing cryptographic communication between the base station and the mobile station, the mobile station follows a dynamically moving mobile station and performs wireless communication. A key management system for securely transmitting an appropriate mobile station communication key to the corresponding base station of a mobile station in the zone, with the aim of ensuring the security of the entire communication system without increasing the size of the equipment, and exchanging the center. In a mobile communication system including a station, a base station, and a mobile station, the center conversion station authenticates the mobile station and the base station, and determines a key required for encrypted communication between the mobile station and the base station. Means for instructing key distribution of the corresponding mobile station, and a center exchange key for each base station and a communication key of each mobile station, which are encrypted with the center side master key stored in the center exchange. According to the instructions of the station In the security module on the side of the center switching center, decryption is performed once using the center station master key, and the master key of the corresponding base station and the communication key of the mobile station are obtained. Means for encrypting the communication key of the mobile station and transmitting the key to the corresponding base station. Means for decrypting the communication with the base station master key to obtain the communication key of the mobile station, and encrypting the communication between the base station and the mobile station with the key. When performing, the mobile station follows the moving mobile station and distributes an appropriate mobile station communication key to a corresponding base station of the mobile station in a wireless zone.
本発明は，センタ交換局，基地局及び移動機からなる
移動通信システムにおいて，基地局と移動機間の暗号通
信を行う際，ダイナミックに移動する移動機に追従し，
無線ゾーン内にある移動機の該当基地局へ適切な移動機
通信鍵を安全に送る鍵管理方式に関する。According to the present invention, in a mobile communication system including a center exchange, a base station, and a mobile station, when performing cryptographic communication between the base station and the mobile station, the mobile station follows a dynamically moving mobile station,
The present invention relates to a key management system for securely transmitting an appropriate mobile station communication key to a corresponding base station of a mobile station in a wireless zone.
最近，自動車電話や携帯電話等，移動通信システムで
はシステム特有の電波傍受の問題があり，この防止策と
して，通信の暗号化が求められている。特に，暗号通信
実施に際し，必要なことは暗号化／復号の鍵の管理であ
る。Recently, in mobile communication systems such as mobile phones and mobile phones, there is a problem of radio signal interception peculiar to the system, and communication encryption is required as a preventive measure. In particular, when performing cryptographic communication, what is necessary is management of encryption / decryption keys.
従来の移動通信の鍵管理方式では、移動通信システム
の基地局と移動局の間で，使用する通信鍵は全て共通
で，固定化している。In a conventional key management method for mobile communication, all communication keys used are common and fixed between a base station and a mobile station of a mobile communication system.
従って，従来方式では，通信システム外の通信傍受に
は強いが，通信システム内の傍受は鍵が共通の為，可能
であった。Therefore, in the conventional method, although the communication is strong against eavesdropping outside the communication system, the eavesdropping inside the communication system is possible because the key is common.
また，万一に移動機が盗難された場合，共通鍵が外部
へ漏洩し，システム全体の安全性が低下するといったも
のである。Also, if the mobile device is stolen, the common key is leaked to the outside, and the security of the entire system is reduced.
この他，移動機毎に異なる鍵を管理する個別鍵管理方
式も考えられるが，各基地局で全ての移動機の鍵を保有
・管理しなくてはならない為、ハードウェア規模が問題
となり，現実的でなくなるといった問題もある。In addition, an individual key management method that manages a different key for each mobile station is also conceivable, but since each base station must hold and manage keys for all mobile stations, the hardware scale becomes a problem, and the There is also the problem of not being the target.
本発明は、かかる従来の問題点を解決するものであ
る。The present invention solves such a conventional problem.
第１図は本発明の鍵配送の仕組みを説明する原理説明
図であり、第１図（Ａ）は、スター型通信網における鍵
管理方式を説明するもので、第１図（Ｂ）は三階層の交
換局階梯における鍵管理構造を説明する図である。FIG. 1 is a diagram for explaining the principle of the key distribution mechanism of the present invention. FIG. 1 (A) illustrates a key management method in a star communication network, and FIG. It is a figure explaining the key management structure in the switching center of a hierarchy.
第１図（Ｂ）図に示す如く、本発明は現状の移動通信
方式の通信網構造がセンタ交換局を頂点に，基地局，移
動機の順で構成される階層構造であることに着目し、セ
ンタ交換局に鍵蓄積ファイルを置き，ここより各基地局
に移動機の鍵を配送するようにし、その鍵を受けて基地
局と移動機間の暗号通信を行うようにしたものである。As shown in FIG. 1 (B), the present invention focuses on the fact that the communication network structure of the current mobile communication system has a hierarchical structure consisting of a base station and a mobile station in the order of a center switching center. Then, a key storage file is placed in the center exchange, and the key of the mobile station is delivered to each base station from here, and the key is received to perform cryptographic communication between the base station and the mobile station.
この鍵配送のために、センタ交換局は基地局からの
鍵配送要求に対して，基地局ゾーンにある該当移動機の
鍵を確実に配送できること、センタ交換局から基地局
までの通信路へ鍵を安全に配送できること、基地局が
管理する鍵が外部に漏洩しても，システム全体の安全性
に影響されないこと、センタで管理する各移動機の鍵
は経済的且つ安全に管理できること等が必要である。For this key distribution, the center exchange station must be able to reliably distribute the key of the mobile station in the base station zone in response to a key distribution request from the base station, and to transmit the key to the communication path from the center exchange station to the base station. That the security of the entire system is not affected even if the key managed by the base station leaks to the outside, and that the key of each mobile device managed by the center can be managed economically and safely. It is.
そこで、本発明は、センタ交換局，基地局及び移動機
からなる移動通信システムにおいて，前記センタ交換局
に，前記移動機，前記基地局の認証を行い，前記移動機
と前記基地局間の暗号通信に必要な鍵を判定し，該当す
る移動機の鍵配送を指示する手段と，前記センタ交換局
側に格納されているセンタ側マスタ鍵で暗号化した各基
地局のマスタ鍵及び各移動機の通信鍵を，前記センタ交
換局の指示により，センタ交換局側のセキュリティモジ
ュール内でセンタ局マスタ鍵を使って一度復号し，該当
する基地局のマスタ鍵及び移動機の通信鍵を得て，基地
局マスタ鍵で該当基地局にある移動機の通信鍵を暗号化
して，該当基地局へ送る手段とを備え，前記基地局側に
は，送られてきた前記基地局の鍵で暗号化した移動機の
鍵を前記基地局側のセキュリティモジュール内で基地局
マスタ鍵で復号し，移動機の通信鍵を得て，この鍵で基
地局と移動機間の通信を暗号化する手段を備え，前記基
地局と前記移動機間の暗号通信を行う際，移動する前記
移動機に追従し，無線ゾーン内にある前記移動機の該当
基地局へ適切な移動機通信鍵を配送することを特徴とす
るものである。Accordingly, the present invention provides a mobile communication system including a center switching center, a base station, and a mobile station, wherein the center switching station authenticates the mobile station and the base station, and performs encryption between the mobile station and the base station. Means for judging a key required for communication and instructing key distribution of the corresponding mobile station; and a master key of each base station and each mobile station encrypted with a center side master key stored in the center exchange. The communication key of the center exchange is once decrypted using the center station master key in the security module of the center exchange in accordance with the instruction of the center exchange, and the master key of the corresponding base station and the communication key of the mobile station are obtained. Means for encrypting the communication key of the mobile station at the base station with the base station master key and sending the communication key to the base station. The base station side encrypts the communication key with the key of the base station. The key of the mobile station is Means for decrypting with the base station master key in the security module, obtaining a communication key of the mobile station, and encrypting communication between the base station and the mobile station with the key, and encrypting the communication between the base station and the mobile station. When performing communication, the mobile station follows the moving mobile station and delivers an appropriate mobile station communication key to a corresponding base station of the mobile station in a wireless zone.
本発明によれば、以下の制御手順となる。 According to the present invention, the following control procedure is performed.
（１）移動機認証制御 移動機側又は一般加入者系より通信要求が生じたと
き，センタ局側は乱数発生器を用いて乱数Ｒを発生さ
せ，これを制御局及び基地局を経由して移動機へ送る。(1) Mobile station authentication control When a communication request is issued from the mobile station side or a general subscriber system, the center station side generates a random number R using a random number generator, and transmits this through a control station and a base station. Send to mobile.
移動機側では受信したＲを鍵KAで暗号化（EKA（R））
し，センタ局側へ送り返す。On the mobile device side, the received R is encrypted with the key KA (E KA (R))
And send it back to the center station.
センタ側では受信した暗号化鍵を復号化し,Rを得る。
ここでのこのＲが先に発生したＲと一致することを比較
器を用いて判定する。一致すれば，センタ局はホームメ
モリ装置に対し，鍵配送の指示をする。The center decrypts the received encryption key to obtain R.
It is determined using a comparator that this R matches the previously generated R. If they match, the center station instructs the home memory device to deliver the key.
（２）鍵配送制御 ホームメモリ装置は該当する移動機のセンタマスタ鍵
で暗号化した通信鍵データ（EKM（KA））にアクセス
し，さらに基地局の鍵で変換（即ち、EKM（KA）を復号
し、該当する基地局の鍵KST1で暗号化してEKST1（KA）
を作る）して，制御局経由で基地局へ配送する。(2) Key distribution control The home memory device accesses the communication key data (E KM (KA)) encrypted with the center master key of the corresponding mobile device, and converts the data with the key of the base station (ie, E KM (KA)). ) Is decrypted and encrypted with the key KST1 of the corresponding base station and E KST1 (KA)
) And deliver it to the base station via the control station.
基地局はホームメモリ装置からの配送データを基地局
の鍵KST1で復号して，移動機の鍵KAを得る。The base station decrypts the delivery data from the home memory device with the key KST1 of the base station to obtain the key KA of the mobile station.
（３）基地局−移動機間暗号通信制御 基地局は移動機の通信鍵KAで一般加入者からの音声デ
ータの暗号化，及び移動機からの秘話データの復号化を
行う。(3) Control of encryption communication between base station and mobile station The base station uses the communication key KA of the mobile station to encrypt voice data from a general subscriber and to decrypt confidential data from the mobile station.
本発明では，鍵配送の確実性に関し，センタ交換局と
全ての基地局は制御局を経由して接続されており，基地
局ゾーンにある移動機から通信要求が生じた場合，その
基地局より，センタ交換局へ要求信号を送り，センタ交
換局は認証制御を行い，この段階でセンタ交換局はどの
基地局のどの移動機なのかを基地局から上がってくる要
求信号より認識できる。従って，正確に該当基地局へ移
動機の通信鍵の配送ができることになる。In the present invention, regarding the reliability of key distribution, the center exchange and all base stations are connected via a control station, and when a communication request is issued from a mobile station in the base station zone, the base station transmits the request. , A request signal is sent to the center exchange, and the center exchange performs authentication control. At this stage, the center exchange can recognize which base station and which mobile station is based on the request signal sent from the base station. Therefore, the communication key of the mobile station can be accurately delivered to the corresponding base station.
鍵配送の安全性に関し，センタ交換局より，各基地局
への鍵は全て基地局の鍵で暗号化して送るので，配送段
階で盗聴されても，元の移動機の通信鍵は推定困難であ
り安全である。Regarding the security of key distribution, all keys to each base station from the central exchange are encrypted with the key of the base station and sent, so even if eavesdropped at the distribution stage, it is difficult to estimate the communication key of the original mobile station. Yes and safe.
基地局の鍵管理に関し，或る基地局の鍵が漏洩して
も，他の基地局は互いに異なる鍵を使用しているので，
被害の拡大はない。従って，システム全体の安全性が低
下することはない。Regarding the key management of the base station, even if the key of one base station is leaked, the other base stations use different keys.
There is no spread of damage. Therefore, the security of the entire system does not decrease.
センタにおける移動機の鍵管理に関し，センタ交換局
で管理する移動機の鍵は全てセンタ交換局の鍵で暗号化
されているので，安全である。また暗号化された鍵は厳
重に保管する必要がなくなる。Regarding the key management of the mobile station at the center, the keys of the mobile station managed by the center exchange are all encrypted with the key of the center exchange, so that it is safe. Also, it is not necessary to store the encrypted key strictly.
第２図は本発明の実施例を説明する図である。図は，
センタ交換局，基地局及び移動機における認証制御，鍵
配送制御，暗号化制御の構成を示している。FIG. 2 is a diagram for explaining an embodiment of the present invention. The figure is
2 shows a configuration of authentication control, key distribution control, and encryption control in a center switching center, a base station, and a mobile device.
センタ局側には、認証制御手段と、ホームメモリと、
鍵配送制御手段を持つ。On the center station side, authentication control means, home memory,
It has key distribution control means.
各基地局側には、鍵配送制御／暗号通信制御手段を持
つ。Each base station has a key distribution control / encryption communication control means.
各移動機側には、認証制御手段と、暗号通信制御手段
を持つ。Each mobile device has an authentication control unit and an encrypted communication control unit.
センタ局と基地局との間は鍵配送制御手段により鍵の
配送が行われ、基地局と移動機との間は配送された鍵に
よる暗号通信が行われることになる。The key distribution control means distributes the key between the center station and the base station, and the encrypted communication is performed between the base station and the mobile device using the distributed key.
制御の手順としては、前記の作用で説明した通りであ
るが、以下第２図の実施例図によりさらに説明する。The control procedure is the same as described in the above operation, and will be further described below with reference to the embodiment diagram of FIG.
移動機側又は一般加入者系より通信要求が生じたと
き，センタ局側は乱数発生器１を用いて乱数Ｒを発生さ
せ，これを制御局及び基地局を経由して移動機へ送る。
この場合の乱数発生器は抵抗器で発生する熱雑音又はＭ
系列疑似乱数発生器を使用する。When a communication request is issued from the mobile station side or a general subscriber system, the center station generates a random number R using the random number generator 1 and sends it to the mobile station via the control station and the base station.
In this case, the random number generator is the thermal noise generated by the resistor or M
Use a sequence pseudo-random number generator.
移動機側では受信したＲを鍵KAを用いて，暗号化装置
２で暗号化（EKA（Ｒ））し，センタ局側へ送り返す。
ここで、暗号化の為のアルゴリズムとしてDES（Data En
cryption Standard:米国IBM社が開発した標準暗号）やF
EAL（Fast Data Encipherment Algorithm:NTT社が開発
したアルゴリズム）を使う。これらのアルゴリズムは入
力したデータ配列を組換え及び置き換えを複雑に行い，
意味不明な暗号文を作り出す操作である。On the mobile device side, the received R is encrypted (E KA (R)) by the encryption device 2 using the key KA, and sent back to the center station side.
Here, DES (Data En
cryption Standard: Standard encryption developed by IBM in the United States) and F
Uses EAL (Fast Data Encipherment Algorithm: algorithm developed by NTT). These algorithms perform complex recombination and replacement of input data sequences,
This is an operation to create a ciphertext whose meaning is unknown.
センタ側では，受信した暗号化鍵を復号装置３で復号
化し,Rを得る。ここでこのＲが先に発生したＲと一致す
ることを比較器４を用いて判定する。一致すれば、セン
タ局はホームメモリ装置５に対し，鍵配送の指示をす
る。ここまでのプロセスにより，移動機のID及び移動機
が所在する基地局がセンタ交換局に認識される。On the center side, the received encryption key is decrypted by the decryption device 3 to obtain R. Here, it is determined using the comparator 4 that this R matches the previously generated R. If they match, the center station instructs the home memory device 5 to distribute the key. By the above process, the ID of the mobile device and the base station where the mobile device is located are recognized by the center switching center.
ホームメモリ装置５は該当する移動機のセンタマスタ
鍵で暗号化した通信鍵データ（EKM（KA））にアクセス
し，さらに基地局の鍵で変換（即ち，EKM（KA））を復
号装置３で復号し，該当する基地局の鍵KST1で暗号化装
置６で暗号化してEKST1（KA）を作る）して，制御局経
由で基地局へ配送する。基地局はホームメモリ装置５か
らの配送データを基地局の鍵KST1を使って復号装置７で
復号して，移動機の鍵KAを得る。ここまでのプロセスに
より，センタ交換局管理の移動機の鍵は該当基地局に配
送される。最後に基地局において移動機の通信鍵KAで一
般加入者からの音声データの暗号化を暗号化装置８で行
い，移動機からの暗号化データの復号を暗号化装置７で
行う。移動機側においても，基地局側から送られてきた
暗号化データの復号を復号装置９で行い，移動機側送信
データの暗号化は暗号化装置２で行う。The home memory device 5 accesses the communication key data (E KM (KA)) encrypted with the center master key of the corresponding mobile device, and further converts the data (ie, E KM (KA)) with the key of the base station. 3 and is encrypted by the encryption device 6 with the key KST1 of the corresponding base station to create E KST1 (KA)) and delivered to the base station via the control station. The base station decrypts the delivery data from the home memory device 5 with the decryption device 7 using the key KST1 of the base station, and obtains the key KA of the mobile station. By the above process, the key of the mobile station managed by the center exchange is delivered to the corresponding base station. Finally, at the base station, encryption of voice data from a general subscriber is performed by the encryption device 8 using the communication key KA of the mobile device, and encryption data is decrypted by the encryption device 7 from the mobile device. Also on the mobile device side, decryption of the encrypted data sent from the base station side is performed by the decryption device 9, and encryption of the mobile device side transmission data is performed by the encryption device 2.
以上説明したように，本発明によれば，従来の各基地
局が，全ての移動機の通信鍵を保管し，該当移動機の鍵
を使って，暗号通信を行う個別鍵管理方式では，各基地
局で管理する移動機の鍵が膨大で，且つ安全性が保てな
い状態にあることに対し，移動機の鍵をセンタ交換局側
で集中管理することにより，各基地局が通信に必要な移
動機の鍵をセンタ交換局より配送が可能となり，安全性
・経済的性に優れた移動通信を提供可能となる。As described above, according to the present invention, in the conventional individual key management method in which each base station stores communication keys of all mobile stations and performs cryptographic communication using the keys of the corresponding mobile stations, While the keys for mobile devices managed by base stations are enormous and the security cannot be maintained, centralized management of mobile device keys at the central exchange enables each base station to communicate. The key of the mobile station can be delivered from the center switching center, and mobile communication with excellent security and economic efficiency can be provided.
従って、移動通信方式用暗号通信の鍵管理に寄与する
ところが大きい。Therefore, it greatly contributes to the key management of the encrypted communication for the mobile communication system.
第１図は本発明の鍵配送の仕組みを説明する原理説明図
であり、第１図（Ａ）は、スター型通信網における鍵管
理方式を説明するもので、第１図（Ｂ）は三階層の交換
局階梯における鍵管理構造を説明する図、 第２図は本発明の実施例を説明する図である。FIG. 1 is a diagram for explaining the principle of the key distribution mechanism of the present invention. FIG. 1 (A) illustrates a key management method in a star communication network, and FIG. FIG. 2 is a diagram for explaining a key management structure in a hierarchical switching center, and FIG. 2 is a diagram for explaining an embodiment of the present invention.
Claims (1)
移動通信システムにおいて， 前記センタ交換局に，前記移動機，前記基地局の認証を
行い，前記移動機と前記基地局間の暗号通信に必要な鍵
を判定し，該当する移動機の鍵配送を指示する手段と， 前記センタ交換局側に格納されているセンタ側マスタ鍵
で暗号化した各基地局のマスタ鍵及び各移動機の通信鍵
を，前記センタ交換局の指示により，センタ交換局側の
セキュリティモジュール内でセンタ局マスタ鍵を使って
一度復号し，該当する基地局のマスタ鍵及び移動機の通
信鍵を得て，基地局マスタ鍵で該当基地局にある移動機
の通信鍵を暗号化して，該当基地局へ送る手段とを備
え， 前記基地局側には，送られてきた前記基地局の鍵で暗号
化した移動機の鍵を前記基地局側のセキュリティモジュ
ール内で基地局マスタ鍵で復号し，移動機の通信鍵を得
て，この鍵で基地局と移動機間の通信を暗号化する手段
を備え， 前記基地局と前記移動機間の暗号通信を行う際，移動す
る前記移動機に追従し，無線ゾーン内にある前記移動機
の該当基地局へ適切な移動機通信鍵を配送することを特
徴とする移動通信用暗号通信システムの鍵管理方式。1. A mobile communication system comprising a center exchange, a base station, and a mobile station, wherein the center exchange authenticates the mobile station and the base station, and performs cryptographic communication between the mobile station and the base station. Means for determining a key required for the mobile station, and instructing key distribution for the mobile station; and a master key for each base station and a master key for each mobile station, which are encrypted with the center-side master key stored in the center exchange. The communication key is decrypted once using the center station master key in the security module on the side of the center switching station in accordance with the instruction of the center switching station, and the master key of the corresponding base station and the communication key of the mobile station are obtained. Means for encrypting the communication key of the mobile station at the corresponding base station with the station master key and transmitting the encrypted communication key to the corresponding base station. Key to the base station Means for decrypting with the base station master key in the security module, obtaining a communication key of the mobile station, and encrypting communication between the base station and the mobile station with the key, and encrypting the communication between the base station and the mobile station. Key management in a cryptographic communication system for mobile communication, characterized in that when performing communication, the mobile station follows the moving mobile station and distributes an appropriate mobile station communication key to a corresponding base station of the mobile station in a wireless zone. method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1340401A JP2893775B2 (en) | 1989-12-29 | 1989-12-29 | Key management method for cryptographic communication system for mobile communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1340401A JP2893775B2 (en) | 1989-12-29 | 1989-12-29 | Key management method for cryptographic communication system for mobile communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03203431A JPH03203431A (en) | 1991-09-05 |
| JP2893775B2 true JP2893775B2 (en) | 1999-05-24 |
Family
ID=18336601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1340401A Expired - Fee Related JP2893775B2 (en) | 1989-12-29 | 1989-12-29 | Key management method for cryptographic communication system for mobile communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2893775B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5204902A (en) * | 1991-09-13 | 1993-04-20 | At&T Bell Laboratories | Cellular telephony authentication arrangement |
-
1989
- 1989-12-29 JP JP1340401A patent/JP2893775B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03203431A (en) | 1991-09-05 |
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