CN1189071A - Apparatus and method for securing electronic information in wireless communication device - Google Patents
Apparatus and method for securing electronic information in wireless communication device Download PDFInfo
- Publication number
- CN1189071A CN1189071A CN97126409.0A CN97126409A CN1189071A CN 1189071 A CN1189071 A CN 1189071A CN 97126409 A CN97126409 A CN 97126409A CN 1189071 A CN1189071 A CN 1189071A
- Authority
- CN
- China
- Prior art keywords
- information
- electronic
- microcontroller
- electronic information
- external storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
- Storage Device Security (AREA)
Abstract
An apparatus for securing electronic information includes a microcontroller and an external memory coupled thereto. The microcontroller comprises a one-time programmable security flag that is programmed when the electronic information is stored in the memory. Once programmed, the security flag prevents reprogramming of the memory. Additionally, the microcontroller comprises an algorithm that generates electronic authentication information from the electronic information. The authentication information is stored in the memory along with the electronic information. Upon retrieval from the memory for registration, the electronic information is authenticated by generating new electronic authentication information to compare to the authentication information stored in the memory. Such authentication prevents swapping out of the memory to gain system access.
Description
The present invention relates generally to radio communication device, more specifically, relate to the electronic information that is stored in the radio communication device.
Wireless communication system is more and more general.In this system, the user uses local communication device, as portable cellular phone, communicates by letter with the communicator such as the cellular basestation in a distant place.Communication realizes by the transmission of radio frequency (RF) signal between local device and base station, a distant place.
Be initialize communications, local device transmission electronic information arrives distant place device with registration as electronics string number (ESN).Based on reception, distant place device judges whether allow local device to call out based on ESN in system.Remove the user who is used to limit only permission mandate and carry out system's access, user's charge that ESN is used to call out in system.
In many wireless communication systems, ESN is transmitted into distant place device with cipher mode not, and therefore, and it is not secret and is easy to be received by unauthenticated user.Unauthenticated user goes into local device by the programming electronic information and encroaches right to call out by local device to be engaged in corrupt practice.This malpractices cause call charge that authenticated user is not carried out for them.
Past, the danger of malpractices by the storage ESN in semiconductor device such as integrated circuit non-volatile storing apparatus and reduce.More specifically, ESN is stored in EEPROM (EEPROM), its built-in being installed in the microcontroller of being used by local communication device.In service, EEPROM can not insert in the pin output by microcontroller, and therefore, can not easily be programmed or alternative with " clone (cloned) " ESN again.
Yet combination EEPROM and microcontroller are very expensive in same integrated circuit.Can provide the semiconductor fabrication of non-volatile storing apparatus more expensive with respect to the process that logical circuit only is provided.In non-volatile memory and logical circuit are combined in the single microcontroller, because the output that the programming of non-volatile memory was lost efficacy reduces the expense that can increase final products greatly.
The invention provides a kind of apparatus and method that are used at the radio communication device securing electronic information, they do not need with the non-volatile memory device that is encapsulated in the microcontroller device.
The invention provides a kind of device that is used at the radio communication device securing electronic information, described device comprises:
External storage; With
Microcontroller, be coupled to described external storage, to store described electronic information therein, described microcontroller further comprises the disposable programmable encryption indicator, the storage of the described electronic information of described disposable programmable encryption indicator indication in described external storage.
The invention provides a kind of method that is used for securing electronic information, described method comprises step;
Store described electronic information in external storage; With
Programming disposable programmable encryption indicator in microcontroller is with the storage of the described electronic information of indication in described external storage.
The device that is used for securing electronic information comprises non-volatile memory and microcontroller.Memory is arrived microcontroller by coupled outside.Microcontroller comprises the disposable programmable encryption indicator, and it is programmed when electronic information is stored in memory.In case programming, encryption indicator prevents the programming again of memory.In addition, microcontroller comprises cryptographic algorithm, and it produces Electronic dicrimination information during the programming of electronic information.Electronic dicrimination information is stored in memory with electronic information.Based on extracting electronic information from memory with registration, produce new Electronic dicrimination information by cryptographic algorithm, be stored in memory in Electronic dicrimination information compare, come the authentication electronic information.This authentication prevents that obtaining system with the memory that swaps out inserts.Therefore, do not resemble current device, securing electronic information in the memory of this device outside microcontroller.
Advantage of the present invention is: the device manufacturing cost reduces, and reliability improves, device secret effective.
Accompanying drawing is simply described
Fig. 1 is a block diagram of describing to use the wireless communication system of a distant place and local communication device;
Fig. 2 is the block diagram of device of controller that is used for the local communication device of Fig. 1;
Fig. 3 describes device by Fig. 2 be used to the programme flow chart of method of electronic information wherein;
Fig. 4 is a functional block diagram, describes to be used to produce the method for the authentication code use of the electronic information that is associated with Fig. 3 by the device of Fig. 2; With
Fig. 5 is a flow chart, describes the method by the device use of Fig. 2, with the electronic information of authentication Fig. 3.
When local device 104 when opening state, the RF signal of Radio Link 106 is received by antenna 108, and is converted into the reception data-signal by transceiver 110, is coupled to controller 112 by bus 116.Controller 112 is handled data and the voice signal that receives, and they further are coupled to user interface 114 outputs by bus 118.The speech and the data that are input to user interface 114 are coupled to controller 112 by bus 118, to be processed into transmitted data signal.Controller 112 is exported on bus 116 and is transmitted, with by transceiver 110 conversion, and by the RF signal emission of antenna 108 with Radio Link 106.
Microcontroller 202 comprises microprocessor 208, disposable programmable ROM (read-only memory) 210, configuration ROM 211, masked edit program ROM212, RAM (random access memory (RAM)) 214, external storage interface 216 and DLL (dynamic link library) 218.Microprocessor 208 is coupled to DLL (dynamic link library) 218 by microcontroller 202 internal serial bus 226.Microprocessor 208, disposable programmable ROM210, configuration ROM 211, masked edit program ROM212, RAM214 and external storage interface 216 are by microcontroller 202 inner common parallel bus 220 couplings.Microprocessor 208 is coupled to transceiver 110 by the outside expansion bus 222 of microcontroller 202, other circuit of controller 112 and user interface 114.DLL (dynamic link library) 218 is coupled to user interface 114 by the outside expansion bus 228 of microcontroller 202.Bus 222 and 228 can form the bus 116 of Fig. 1 and 118 sub-bus.The external storage interface 216 of Fig. 2 is coupled to EEPROM204 by the outside expansion bus 206 of microcontroller 202.Microcontroller 202 preferably is manufactured in the monolithic integrated circuit with the known semiconductor manufacturing technology.
Microprocessor 208 is parallel devices, and the operation of its responder instruction and data is used for control device 200.Program command is to be stored in masked edit program ROM212 or the coupled outside electronic information in the ROM (not shown) of microcontroller 202.Data are the electronic information that preferably are stored in configuration ROM 211 and RAM214.Microprocessor 208 inserts disposable programmable ROM210 by shared bus 220, configuration ROM 211, and masked edit program ROM212 and RAM214 are to extract electronic information from it, as program command and data; To carry out program command wherein; With storage electronic information wherein; Or the like.All bus processing that relate to shared bus 220 are not visible outside microcontroller 202.Disposable programmable ROM210, masked edit program ROM212 and RAM214 can not insert outside microcontroller 202.
Disposable programmable ROM210 comprises the position, is used to store encryption indicator (flag), programmes to prevent electronic information again.In the embodiment of describing, encryption indicator is an ESN encrypted bits 230, comprises a bit.In ESN encrypted bits 230, binary one indication ESN205 and MAC207 have been been programmed into EEPROM204.In ESN encrypted bits 230, binary zero indication ESN205 and MAC207 are not been programmed into EEPROM204.During the programming of electronic information, ESN encrypted bits 230 is stored among the disposable programmable ROM210, followingly further describes.Disposable programmable ROM210 can be realized by fuse memory (fuse bank) or other disposable programmable technology.
Configuration ROM 211 comprises the position, is used to store the secret key that adds that is used to produce Electronic dicrimination information.In the embodiment of describing, adding secret key is secret key 232, comprises 64 binary digits, it comprise at random 56 bits and 8 binary digit inspections and.During the manufacturing of microcontroller 202, as surveying at the wafer with laser reconditioning or fuesable link technology, secret key 232 is stored in the configuration ROM 211.For guaranteeing the secret of secret key 232, when the sign indicating number outside the execution masked edit program ROM212, microcontroller 202 forbids being linked into secret key 232.This encryption measures is further described in sequence number is 08/730,188 U.S. Patent application, and its " microcontroller that restriction inserts inner memory " by name applied on October 14th, 1996 with the name of Dorsey etc., and transferred Motorola Inc..
Masked edit program ROM212 comprises the position, is used for the storage instruction with the authentication electronic information, and in the embodiment of describing, instruction is a message authentication program 234.During making microcontroller 202, message authentication program 234 preferably is stored among the masked edit program ROM212.
RAM214 provides the position, temporary transient storage electronic information and Electronic dicrimination information during programming that is used for further describing below and the authentication process.In the embodiment of describing, electronic information temporarily is stored in RAM214 as the temporary transient ESN236 that comprises 32 bits, and digital certificate information temporarily is stored in RAM214 as the temporary transient MAC238 that comprises 32 bits.
External storage interface 216 provides compatible between microcontroller 208 and the EEPROM204.External storage interface 216 conversion is by the electronic information of microcontroller 208 outputs, and the parallel form on the bus 220 becomes the serial form on the bus 206.Similarly, the electronic information that external storage interface 216 conversion is extracted from EEPROM204 by bus 206 becomes parallel form on the bus 220 from serial form.
DLL (dynamic link library) 218 allows programming electronic information access to plant 200.DLL (dynamic link library) 218 provides microprocessor 208 and is coupled to coupling between the outside programming accessories (not shown) of external testing connector of user interface 114 discretely.In the embodiment of describing, DLL (dynamic link library) 218 conversion is by the electronic information of outside programming accessories output, from becoming the serial form on bus 226 at the proprietary protocol on the bus 228 such as three-way bus protocol or DSC (digital speech control) agreement.Similarly, DLL (dynamic link library) 218 conversion becomes proprietary protocol on bus 228 by microprocessor 208 in the electronic information of output on the bus 226.
According to the method for describing among Fig. 3, electronic information is programmed into device 200.The method of Fig. 3 is hereinafter got in touch Fig. 2 and is described.Method is carried out as the some of its program command by microprocessor 208.Receive the ESN program command based on attached programming accessories to DLL (dynamic link library) 218 (by user interface 114 and bus 228) with from programming accessories, method begins (frame 300).Based on receiving order, microprocessor 208 is read ESN encrypted bits 230 (frame 302) from disposable programmable ROM210.If ESN encrypted bits 230 is binary one (being that ESN encrypted bits 230 has been programmed), microprocessor 208 is by suspending the trial response ESN program command (frame 304) that follow-up programming ESN enters EEPROM204.
If ESN encrypted bits 230 is binary zeroes, microprocessor 208 enters programming EEPROM204.Microprocessor 208 passes through to receive ESN from programming accessories and responds ESN program command (frame 306) as temporary transient ESN236 with temporary transient this ESN of storage in RAM214.Microprocessor 208 produces and is associated with the MAC of temporary transient ESN236, and stores the temporary transient MAC238 (frame 308) of this MAC conduct in RAM214.
Temporary transient MAC238 is produced according to the method that Fig. 4 describes.Method is implemented in the message authentication program 234 of the Fig. 2 that is stored among the masked edit program ROM212.Message authentication program 234 is carried out from masked edit program ROM212 by microprocessor 208.Message authentication program 234 comprises the authentication arithmetic 400 of Fig. 4.Authentication arithmetic 400 is cryptographic algorithm, and it produces Electronic dicrimination information with adding secret key from electronic information.
In the embodiment of describing, authentication arithmetic 400 is the data authentication algorithms (DAA) by definition in No. 113, national standard place FIPS (Federal Information Processing Standards) publication of US Department of Commerce.The data encryption standard (DES) of DAA by definition in the national standard place FIPS publication of US Department of Commerce 46-1 number.For producing temporary transient MAC238, microprocessor 208 extracts secret keys 232 from configuration ROM 211, and input secret key 232 and ESN word 402 are to authentication arithmetic 400.
For compatible with DES, ESN word 402 comprises the multiple of 64 bits or 64 bits.In one embodiment, microprocessor 208 is by the afterbody generation ESN word 402 of attached 32 binary zero positions to temporary transient ESN236.In another embodiment, microprocessor 208 attach message are as the afterbody of mixed and disorderly sign indicating number to temporary transient ESN236.The shortening that mixed and disorderly sign indicating number is relatively large message is represented.An example of mixed and disorderly sign indicating number be the 32 binary digit inspections that produce of the content from masked edit program ROM212 and.Another example is according to encrypting the eap-message digest that mixed and disorderly algorithm (SHA-1) produces, and SHA-1 is by definition in the national standard place FIPS publication of US Department of Commerce 180-1 number.Eap-message digest is 160 bits that produced from any message of the longest 264 bits by SHA-1, as is stored in the program command in masked edit program ROM212 or the microcontroller 202 external ROM (not shown).Any variation to message (being the program command of masked edit program ROM212 and external ROM) will cause producing different eap-message digests.In case produce, eap-message digest can be stored among the EEPROM204.
Though DAA, DES and SHA-1 preferably are used in the embodiment of describing, and person of skill in the art will appreciate that also to use other cryptographic algorithm, to produce Electronic dicrimination information, and therefore, used here " algorithm " should be represented each of equivalent of these and they.
Refer again to Fig. 2 and Fig. 3, in case produce temporary transient MAC238, microprocessor 208 temporary transient ESN236 of storage and temporary transient MAC238 are in EEPROM204, respectively as ESN205 and MAC207 (frame 310).The ES205 and the MAC207 that are stored among the EEPROM204 are not encrypted.Microprocessor 208 is programmed in the ESN encrypted bits 230 among the disposable programmable ROM210, so that binary one value (frame 312) to be arranged.In case ESN encrypted bits 230 is programmed, the method for programming electronic information finishes (frame 304).
Before calling out, the local device 104 of Fig. 1 must be launched the distant place device 102 of the ESN205 of Fig. 2 to Fig. 1, is used for registration on communication system 100.If do not finish registration, can not call out or receive by local device 104.Emission ESN205 arrives before the distant place device 102, and the device 200 of Fig. 2 is according to the method authentication ESN205 that describes among Fig. 5.Authentication is minimized in to practice fraud in the local device that local device 104 or other be used for communication system 100 uses the chance of ESN205.Contact Fig. 2, the method for Fig. 5 is described hereinafter.Method is realized by the message authentication program 234 that is stored among the masked edit program ROM212.Message authentication program 234 is carried out from masked edit program ROM212 by microprocessor 208.The sequence number that the control of the execution of message authentication program 234 is quoted by preamble is that the scheme that 08/730,188 U.S. Patent application is described is encrypted.
When message authentication program 234 when microprocessor 208 receives the orders of ESN authentication, during the program that powers up of local device 104, method begins (frame 500).Based on the reception of order, message authentication program 234 command processors 208 are read ESN encrypted bits 230 (frame 502) from disposable programmable ROM210.If read binary zero (being that ESN encrypted bits 320 is not programmed), message authentication program 234 is suspended authentication, and indication microprocessor 208 is to prevent registration (frame 504).
If binary one is read (being that ESN encrypted bits 230 has been programmed) in ESN encrypted bits 230, message authentication program 234 proceeds to authentication ESN205.Message authentication program 234 command processors 208 extract ESN205 and MAC207 from EEPROM204, and storage ESN205 and MAC207 are respectively temporary transient ESN236 and temporary transient MAC238 (frame 506) in RAM214.Message authentication program 234 command processors 208 produce new MAC (frame 508) from temporary transient ESN236.New MAC describes and produces the method generation of temporary transient MAC238 during programming with reference to Fig. 4 with the front.That is, authentication arithmetic 400 is from temporary transient ESN236 with add secret key 232 and produce new MAC.
In case produce, message authentication program 234 instructs microprocessor 208 newer MAC and temporary transient MAC238 (frame 510).If new MAC and temporary transient MAC238 do not match, message authentication program 234 indication microprocessors 208 are to prevent registration (frame 504).If new MAC is the same with temporary transient MAC238, ESN205 is by authentication.Message authentication program 234 indication microprocessors 208 are to register and to launch ESN205 to distant place device 102 (frame 512).In case microprocessor 208 is by sign emission ESN205, the method for authentication ESN205 finishes (frame 504).
Though be depicted in the cellular radio, here programming of describing and authentication electronic information also will be used for cordless telephone, two-way radio, trunked radio, beep-pager, personal digital assistant and analog, and used here " device " should represent each of equivalent of these and they.
Though these apparatus and method are illustrated as being encrypted in ESN in the external storage device, person of skill in the art will appreciate that other electronic information can be by similar encryption as the program command that is stored in the microcontroller external ROM.By the program command among the ROM is associated with encryption indicator and the digital certificate information that is stored among the ROM in being contained in microcontroller, and during communicator powers up program, on program command, carry out authentication, undelegatedly programme again and exchange out external ROM and can be prevented from.
Therefore, can see, practice fraud use electronic information,, can be minimized, even when electronic information such as ESN are stored among the memory device of microcontroller integrated circuit outside such as the EEPROM by unencryption as cellular radiotelephone system to obtain access communication system.By use the disposable programmable encrypted bits at microcontroller, the programming again of ESN is prevented from.By use based on produce and need ESN and as the accidental enciphering spoon of the authentication arithmetic of the contact between MAC Electronic dicrimination information, system's access can not be exchanged out EEPROM and reached by the EEPROM that contains different ESN and MAC with another.
Claims (10)
1. be used for the device at the radio communication device securing electronic information, described device comprises:
External storage; With
Microcontroller, be coupled to described external storage, to store described electronic information therein, described microcontroller further comprises the disposable programmable encryption indicator, the storage of the described electronic information of described disposable programmable encryption indicator indication in described external storage.
2. device as claimed in claim 1, wherein said microcontroller also comprises microprocessor, the disposable programmable memory that stores described disposable programmable encryption indicator, storage produces the masked edit program memory of the algorithm of Electronic dicrimination information from described electronic information, with the internal bus that is coupled to described microprocessor, described disposable programmable memory and described masked edit program memory, carry out described method with described microcontroller, to store described Electronic dicrimination information in described external storage.
3. be used for the device at the radio communication device securing electronic information, described device comprises:
External storage is with storage electronic information and relative Electronic dicrimination information; With
Microcontroller, be coupled to described external storage, described microcontroller also comprises algorithm, to produce digital certificate information from described electronic information, described microcontroller with described algorithm based on extract described electronic information and described Electronic dicrimination information, the described electronic information of authentication from described external storage.
4. device as claimed in claim 3, wherein, described microcontroller also comprises microprocessor, the masked edit program memory that stores described algorithm, the disposable programmable memory of storage encryption indicator, described electronic information of storage and described Electronic dicrimination information in described external storage with internal bus that is coupled to described microprocessor, described masked edit program memory and described disposable programmable memory and the indication of described encryption indicator are to prevent the programming again of described external storage.
5. device as claimed in claim 3, wherein, described microcontroller also comprises microprocessor, the masked edit program memory that stores described algorithm, the storage secret key is with configuration memory that is used by described algorithm and the internal bus that is coupled to described microprocessor, described masked edit program memory and described configuration memory.
6. the method that is used for securing electronic information, described method comprises step:
Store described electronic information in external storage; With
Programming disposable programmable encryption indicator in microcontroller is with the storage of the described electronic information of indication in described external storage.
7. method as claimed in claim 6 also comprises step:
At described microcontroller, receive described electronic information from outside programming accessories;
By being stored in the algorithm in the described microcontroller, produce Electronic dicrimination information; With
Store described Electronic dicrimination information in described external storage.
8. the method that is used for securing electronic information, described method comprises step:
Extract Electronic dicrimination information and electronic information from external storage; With
In microcontroller, from described electronic information and the described electronic information of described Electronic dicrimination information authentication.
9. method as claimed in claim 8, the step of wherein said authentication comprises substep:
Provide electronic information to the algorithm that is stored in described microcontroller;
Provide to described algorithm and to add secret key;
Receive new Electronic dicrimination information from described algorithm; With
More described new Electronic dicrimination information and described Electronic dicrimination information.
10. method as claimed in claim 8 also comprises step:
Extraction is contained in the encryption indicator of the disposable programmable memory of described microcontroller; With
Only when described encryption indicator has been programmed, carry out the step of described extraction Electronic dicrimination information and electronic information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97126409.0A CN1189071A (en) | 1996-12-31 | 1997-12-30 | Apparatus and method for securing electronic information in wireless communication device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US775,656 | 1996-12-31 | ||
| CN97126409.0A CN1189071A (en) | 1996-12-31 | 1997-12-30 | Apparatus and method for securing electronic information in wireless communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1189071A true CN1189071A (en) | 1998-07-29 |
Family
ID=5177658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97126409.0A Pending CN1189071A (en) | 1996-12-31 | 1997-12-30 | Apparatus and method for securing electronic information in wireless communication device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1189071A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321379C (en) * | 2003-07-03 | 2007-06-13 | 扬智科技股份有限公司 | Programmable controlled data handling equipment |
| CN104867519A (en) * | 2009-12-31 | 2015-08-26 | 英特尔公司 | Tamper resistant fuse design |
| CN106603800A (en) * | 2015-10-14 | 2017-04-26 | 天津济旋科技有限公司 | Method for collecting electronic information based on electronic signal |
-
1997
- 1997-12-30 CN CN97126409.0A patent/CN1189071A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321379C (en) * | 2003-07-03 | 2007-06-13 | 扬智科技股份有限公司 | Programmable controlled data handling equipment |
| CN104867519A (en) * | 2009-12-31 | 2015-08-26 | 英特尔公司 | Tamper resistant fuse design |
| CN104867519B (en) * | 2009-12-31 | 2018-04-27 | 英特尔公司 | tamper resistant fuse design |
| CN106603800A (en) * | 2015-10-14 | 2017-04-26 | 天津济旋科技有限公司 | Method for collecting electronic information based on electronic signal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5954817A (en) | Apparatus and method for securing electronic information in a wireless communication device | |
| US5077790A (en) | Secure over-the-air registration of cordless telephones | |
| EP0977451B1 (en) | Data transfer verification based on unique id codes | |
| US5467398A (en) | Method of messaging in a communication system | |
| US5457737A (en) | Methods and apparatus to verify the identity of a cellular mobile phone | |
| AU758451B2 (en) | Subscriber validation method in cellular communication system | |
| AU772601B2 (en) | A method for secure handover | |
| US5722084A (en) | Cellular/PCS handset NAM download capability using a wide-area paging system | |
| US6124799A (en) | Methods and apparatus for locking communications devices | |
| US4484025A (en) | System for enciphering and deciphering data | |
| US6108424A (en) | Mobile radio telephone station comprising a protection system for at least one authentication number and method of protecting an authentication number | |
| US20030061488A1 (en) | Cloning protection for electronic equipment | |
| WO2000020972A9 (en) | Programmable telecommunications security module for key encryption adaptable for tokenless use | |
| JPH11275215A (en) | Mobile telephone set and network lock control method | |
| EP0630167A2 (en) | Personal communicator with programmable number assignment module using a wide-area paging system | |
| AU675068B2 (en) | Mobile communication terminal device and method of preventing fraudulent information rewriting | |
| EP0565528B1 (en) | Secure over-the-air registration of cordless telephones | |
| CN111758248B (en) | Method, device and chip for automatically identifying identity | |
| CN1189071A (en) | Apparatus and method for securing electronic information in wireless communication device | |
| US6836655B1 (en) | Secure interlink receiver for remote programming of wireless telephones | |
| US6285870B1 (en) | Telephony device comprising a base station and at least one handset, subscription method of a handset, handset and base station suitable for such a device | |
| US20040252838A1 (en) | Mechanism for secure transmission of signals in wireless communication devices | |
| JP2000172175A (en) | Secure method for generating password function output | |
| AU649742B2 (en) | Secure over-the-air registration of cordless telephones | |
| MXPA98000165A (en) | Apparatus and method for protecting electronic information in a communication device inalambr |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |