WO2001039134A2

WO2001039134A2 - Security system comprising a biometric sensor

Info

Publication number: WO2001039134A2
Application number: PCT/DE2000/004140
Authority: WO
Inventors: Christofer Hierold; Volker Lehmann
Original assignee: Infineon Technologies Ag
Priority date: 1999-11-25
Filing date: 2000-11-23
Publication date: 2001-05-31
Also published as: WO2001039134A3

Abstract

The invention relates to a security system that uses chip cards (1) comprising a biometric sensor (10), a fingerprint sensor for instance. Biometric information, i.e. the location of fingerprint minutias for instance, that is detected by the sensor (10) is compared to stored reference data which are separated into a first and a second part, whereby said parts are only stored in the data carrier (1) or are only stored in the reading device (2). Data security against the unauthorised reading out of reference information and the security against influencing the current authentication process are thus increased.

Description

description

Security system with a biometric sensor

The invention relates to a security system, comprising: a central unit with a biometric sensor for determining biometric data which represent characteristic biometric features of a person; at least one mobile data carrier; storage means for storing biometric reference data representing biometric reference features for the person in the system; a control device in order to generate a release signal for controlling a functional unit as a function of a comparison between the biometric data determined by the sensor and the reference data.

The invention also relates to a method for operating such a security system.

Conventional security systems comprise a data carrier, for example in the form and size of a check card, which contains a sensor which determines biometric characteristics of the operator in order to ensure that the operator is authorized to use the data carrier. The data carrier enables access to a functional unit in security systems. For example, the data carrier for banking applications contains a fingerprint sensor and exchanges data with an automated teller machine to enable the operator to access his personal account.

A data carrier with a fingerprint sensor is described in US Pat. No. 4,582,985. After the operator places his finger on the sensor, the fingerprint is measured in order to generate a corresponding data bit stream. This is compared with reference information stored on the chip card. If there is sufficient agreement, the data carrier is released by a signal path between see disk and reader is unlocked. The authenticity of the user is determined entirely within the chip card and communicated to the reader accordingly.

The disadvantage is that the release signal is not sufficiently protected. It could be falsified in the event of a fraudulent attack, so that an unauthenticated user could nevertheless gain access to the device protected by the security system. In other known systems, release signals are therefore again protected by suitable cryptological methods. However, this requires corresponding circuitry for a cryptoprocessor on the data carrier and corresponding decoding devices in the reader. In addition, the cryptocode could be decrypted over time due to the evolving technology.

The object of the present invention is to provide a security system of the type described in the introduction which is sufficiently secure and requires comparatively little effort.

According to the invention, this object is achieved by a security system of the type mentioned at the outset, which is characterized in that the biometric reference data are formed from a first and a second part and that the first part is stored in the data carrier and the second part in the central unit are.

A method for operating a security system according to the invention is specified in claim 10.

In the security system according to the invention, the reference data with which the biometric data ascertained by the sensor are compared are used to check the authenticity of the

, Φ SD ^ C ^Q CQ ü (D = Tl Di Ό 3 CQ CÖ CQ W rt 3 CQ HT c CQ CQ c CQ CQ tr s: CQ Hl

F- F- F, s ^ F- rt Φ F- HT F- Φ 0 = F, φ Ω Φ F- Φ F- F- F- F- Φ 0 = 3 Φ φ 3 Φ F- F- Φ F - 0 rt (^

Φ Φ 3 ω! -S F- m Φ Hi 3 CQ F- Hi πr CQ Ω F, Ω Φ CQ rt F, F, HJ F HS Ω Ω HS HT SD = rt

F- IQ 3 SD CQ rt rt Hl rt Φ 0 HT HT CQ rt SD = <rt φ • HT HT SD Hi N

S, * J rt s: Φ 3 πι O F- Φ φ rt Φ F 3 rt SD Φ rt Φ HT rt Φ F, ≤ tr F- HS rt Di Φ

F- DJ rt Φ F rt m F, n H Φ Di tr F, Hl Φ F, 0 Φ Φ 3 M SD F- Hi F- SD F- H

2 Φ F, SD rt rt πr (D CQ r ¹ CΛ Φ cn Φ ≤ HT F, Φ CQ rt F, F, φ F- CQ 0 0 C CQ ω

? T F- Di r Φ CQ Φ tr SD Φ F- Φ F, Φ SD Φ (D M ^ 3 c N Φ 3 rt H Hi Hi

CD C rt Φ α N hj CQ CQ Hl Hi Hl CQ ri C F- ^ F- 0 = Η Ω Di φ F- ^ Φ • 3 SD N ω PF, C SD o H, F- Φ CQ Φ CQ Hi rt F- Hl 3 HT Φ Hl rt> F- (D <D. CC

F, S ^ ch, * J CQ rt cn 0 CQ 0 N φ Φ CQ H) CQ 3 SD 3 - CQ Φ tr H ⁾ σ rt 0 Φ Hi

Φ φ HS Φ n SD φ Φ n HT <! F, F s: HS Hl SD - H Hi N F- HT Φ F- F- lS 3 tr hh 2 _V * υ ü? R 0 ^ Φ Hl F- F- CQ C Φ F- <ω 0 = φ 0 D. φ

Φ Φ rt Φ F- s: CQ ü H3 F- <Ω? Φ Hi th Ω Φ F- CQ 0 Ω ^ tr Hi α α Φ CQ hj F, F- CQ HS ^ F- Φ 3 M Hl Φ t SD Hi 0 SD H HT Hi Φ Hl rt H HT Φ Φ H (D SD 3 rt

Φ Φ 3 ^> ü Φ CQ CQ F, D 2 F- CQ H, 3 Hl H, CΛ> Φ Φ Φ ^ <! SD HS rt Hl tr rt rt F-

HS HS F 03 0 - α ü ω F- Hi Φ s: SD: H5 H Di Hi HS Hi SD? φ Hi Φ φ φ α 3

N ESI φ πs Di F- F- Hl F, Φ ÖS & φ 3 Φ C Φ rt SD 0 F. Hi Hi SD 3

& ^ o SD c SD Φ Φ Hl S ^ ^ SD Hi F- Φ F F- CQ S α F- w F- SD C Φ Ω F Φ rt rt rt φ

SD SD ω HT HS ts F ω CQ rt F- tr CQ Hi c rt Φ F- SD Ω F, Hl F, HS ^ HT 3 F- F, F, Φ rr rt rt φ _-T F- CQ C F - Φ rt Hi CQ rt rt HT Φ Φ tr CQ rt SD rt SD = SD = HS φ Φ Φ HS SD O * ü Φ CQ H, rt F- F- CQ Ω rt φ Φ F- φ l_J. Φ rt - CQ CQ rt t-J πs 3 C er F- ≤ M SD 0 = SD- 'Hl Φ S ^ CQ Hi φ Φ HT Φ Hl πι Ω N F- N φ rt F- Φ Φ h. hl

Φ Φ Φ F- p * Ü Hi F, O ≤ rt F- Hi 3 c = • HT c rt C ξ 0: ^> ! SD = F- s: ^ IQ F, 2 rt F- Hl Φ TJ F-? rt Hl tr Φ CQ φ φ F, Hl Φ CQ Ω

Φ c φ fö CQ - ι-h F- ¹ Φ Φ CQ F Di SD tr CQ N F- Ö Hi SD = rt tr F- Φ C SD Φ HT

F, F, CQ Φ HS Φ Φ Hi Q F- Di F- rt φ rt F- CQ F- Di rt Φ Φ (- ¹ F- SD Ω Hi -> F, rt

Ό Hi & I ι— ^■ F SD rt Hi Φ - Φ F- F Φ 3 Φ Φ N Hl s: F- Ω C HT ü Ui

Φ O ⁾ Φ Φ φ Hl F, M φ ^ rt ho φ F- £. N CQ 1 - 'F- CQ HT Hi φ CQ Φ c F- H, CQ D. NS ^ Hl F- 3 Di M Hi F- Ω Φ t- <S ^ s F- ö Φ rt tr ¹ SD φ rt > hn Φ Φ c HS F- Di D CΛ F- Φ F CQ rt HT i φ F φ 2 Ω SD? r HS N Φ C- CQ s:

_. ⁾ HT 3 α ω CQ Hl O Φ CQ Φ rt Hi CQ CQ φ D- CQ F- SD πr rt Φ Hi φ C CQ Ω • ö SD s ^ Si Φ N SD Φ F- S ^ Hl Φ Hi rt F- Ω Hl φ Φ F ¹ rt t> φ Φ Hl H F- F Φ HT φ

F, Φ F, Ξ rt ü F- N Φ Hi F, CQ Φ Hl HT Hi CQ Φ Φ Hi • Φ Ω CQ F- 1

3 rt Φ Φ (D HS C Hl Ϊ α SD 0 F- Di F, SD ö Φ rt i SD <F- HT π> Φ F- Ω

F- • F πs rt Φ rt Φ tr F, rt Φ c F- Ω SD F, N <! Hi φ SD ≤ rt SD c F, 3 HT s:

3 ö rt rt Φ F, Φ i Φ F, Di - Hl rt HT rt M SD = rt Φ Hi Φ F- F, rt SD = φ F-

SD N Φ hj m F- Φ - F, tr Ω CQ rt Φ F- rt Φ F ω Hl b 0 ⁾ rt HT rt tr ¹ H, Φ tr ¹ rt ≤ SD = rt ΪÖ Hi CQ ra ς; Φ Φ HT ~ Di Hl! -J Hl SD F- Ω Hl HS ^ Φ Φ Φ rt

Φ Φ Φ h CQ Φ φ <SD n CQ F- (D SOi ro rt Φ Di i Ω HT SD 0 CQ Hi CQ CQ ~ HT ra Ui O c = Φ SD = Hi 3 r Φ • ö? Rt Hl H s : H- 3 ri <Hi tr HT CQ H ~ 0 rt rt φ φ

Φ ΓΓ K F, hj CQ Φ F- F- CQ F- SD Φ SD = 0 Hi F- Φ Φ c-- F- 3 Di H- Φ CQ CQ

CQ H 3 CQ Φ hj fö H3 N. 3 CQ? R Hl φ CQ M Φ Ω F- CQ tr ¹ Φ SD S ^ Φ N - ¹ φ 0?

Φ SD = J: * ⁾ F, Φ Φ CQ s; 3 0 rt Hl ^ H, φ rt? HT rt HT CQ φ rr 3 F- i HS 0:

H, IQ W SD SD CQ 3 Hi Φ Φ SD ω rt CQ φ F CQ ^ Φ rt φ c Φ Φ Q SD F- Φ rt SD = Di 3

PJ: Φ F- CN Φ F, F- F, Φ φ H, Φ Φ rt F- F- Hi Hi F- φ c 0 N F- F, rt Φ 3 rt HQ F- Hi s: F, F ( D CQ F- Di t- F- F- F- φ tr <J CQ rt S ^ CQ Hi HS C 3 SU hi

Φ £ CQ F- F- Φ σ C F- F- SD CΩ Hl CQ Hi φ ^ Hl Φ Hi F- Hi F-

IQ CQ F, Q Φ FO Hi Di Hl Hi 2 Φ Hl rt (D F- <: D ⁱ tr CQ Di CQ SD tr ¹ CQ Φ Ω

Φ Φ s: HS Ei tr NF CQ F- F- Hl F- σ tr F- Φ 0 Φ Φ φ (D = φ Φ c Φ H: <HT Q CQ Φ s ^ 0 rt O c Φ Φ H ⁾ O rt CQ F- Φ 3 Hl HH, F- H, F- Hi rt 3 Hl rt CQ Φ <! H, Φ

TJ O F- 3 3 <c C Ω Hi P c Φ Ω 0 F- CQ 0 C = HT φ H 0 hi 1

Φ φ CQ L 1 0 p Hl Ϊ rt rt H, HT 3 Φ σ φ MH; SD F- φ rt C = ö CQ Φ CQ Hi h- ¹ Di rt

F- F- Φ φ hj CQ? CQ 0 Φ F- CQ Φ Φ H SD F, H3 tr 3 F- ≤ r SD rt Hl Φ 0 F- Φ <

Ω o ≤ πs SD rt F- Φ SD ^ Hl rt 3 rt ι-i Hi tr Φ Hi Φ Φ rt rt H, F CQ φ F- 0 tT r? s: F- tr tr • ~ CQ Φ Hl Hl C F- F, 0 = Φ F- F- Φ tr ¹ φ Hi H, Φ HS F- SD = i rt

Φ φ Φ 3 Φ Φ F, Φ Hi H ⁾ M F- CQ Hi CQ H ⁾ F, .V Φ 3 rt Hi F- N rt Φ SD = ^ rt - ^J

HFF,> T CQ F- CQ HT CQ CQ rt φ Di Φ SD CQ F- ^ rt Ω F- ^ Hi 0 1 rt rt Φ SD Φ 0 Hi SD φ Φ φ H, s ^ Ω Hl Φ> CQ SD H HT Φ Hl 1 Di 3 CQ

'- * Φ H hj Hl 1 1 SD = φ 3 HT Hl tr SD = rt s == F- 0 πs 1 Hl CQ 1 1 1 1

rt φ hi

hl

SD rt

F-

<o-

hl

HS φ

Hi ⁱ

F- φ α

SD rt φ

Stop

Φ

F- φ

F-

Hi c

3

CQ

Φ

?

Hi πr hi rt

Φ hj

>

hl

0 hj

di

hl

C

HS

CQ

CQ Φ

o rt D. CQ ≤ rt ö CQ HN Hl Ω Φ tsi Ω HS ö CQ Ω <! SD SD CQ rt ö H Hj Hj φ F- Φ Ω Φ Φ SD h- '≤ πr HS C πr Φ F- Φ 0 πr φ c S ^ Φ Φ SD F- F- F-

Hl 0 CQ πr HS HS rt φ Φ c = Φ rt hj Φ HS Φ CQ SD hj hh hh hj Hi CQ CQ CQ CQ

CQ HS F, HS Φ F- SD Ω Ω HS ω πs SD Φ πs 3 SD = rt s ^ s ^ C

0 CQ ö F- HS Ω HS? R πr • Ό> Di 2 <HS - F- F- Di ci ^¬ hj F- hj Hi Hi hj CQ SD rt πr CQ 3 rt c F- 0 Di CQ tΛ SD φ SD = Hi

Ω rt rt Φ 3 rt Φ SD: F- Dd φ rt tr? 3 rt SD Ω rt Ό HS to CQ u> to F ¹

H HT Φ hj F- 0 t> CQ F- Ω πr Φ H C πr • SD Φ Hd

O hi Hl Φ rt φ i-i F- Φ Hl πr Φ 0 ^ ≤ hh N Di hj F-

F- rt hj F- F- CQ HS Φ πs SD F- Φ α F- Φ α CQ Q rt hj hh 3 D. HS Hi Φ Φ HS rt HS 0 πs Hi Φ ^ F- rt hj F- Φ C CQ Φ CQ C CQ φ π Φ

Φ rt SD = 0 Φ Φ Φ hj o hj Di F- HS Hl Q & 0 Φ F- Φ F- hj ^ F- φ HS Φ F- πr F-

3 CQ ö HS HS rt TJ CQ Φ N rt rt Φ Φ HS <öd Hl CQ Hl πr Di Hj H) F- πs φ SD Φ CQ SD Φ Φ φ rt HS F- Φ hj ii HS ^ rt! *! Φ φ n φ F ¹ rt φ Φ SD O Φ

CQ Hl h | hj rt <H hi F- F- φ φ HS 0 Ό rt SD 0 Hl πr φ Hl s: tr öd?

CQ • CQ φ Φ 0 Φ CQ Ω F F- hj j hj W 3 ≤ S ^ F- n 3 HJ Di F- Di φ SD Q

Φ F- HS 3 F- # Φ πr 3 C> F- 0 rt 3 Φ rt 3 πr SD CQ - ¹ Φ Hl hj F- hj Φ

Hl α F ¹ Ω rt h- 'O φ H HS Φ Hl 3 Φ C- F- N? R F- hj CW c CQ rt CQ φ F- πr hj o 2 F- hj φ o CQ CQ hj rt Φ Hl CQ Φ SD Ό CQ cΛ * s Φ Ω • Ö φ SD

Hi Φ F- SD = • CQ F- "<0 Ω H F- Φ hj hj Φ Di SD? F- 3

H $ s: CQ Φ φ o rt F ¹ CQ s: hj F ¹ CO πr CO Ϊ rt SD CQ F- Di CQ CQ Φ s .: rt

C πr SD Φ F- hj ^• α F ¹ rt F- F- F ¹ φ SD SD i Φ Φ Hi rt SD F- φ HS SD

HS F- D. hj hj Ω Φ α F ¹ D- φ F, rt Hi HS SD rt Φ F- rt φ CQ cc SJi Hi φ SD - HT <F- φ φ 3 Di πr Φ CQ F- tr F- Hl Hl φ Hj CQ rt HS hh CQ hi CQ F> φ 0 Ω hj (DF, 3 F- O CQ CQ 0 φ h- '(D 0 Di S ^ = ti F-

<! N CQ hj 3 πr C CQ φ H ⁾ hi Ω φ Hl <Hl Φ h- ¹ rt 3 hj hj Φ Ω

0 C F Ω SD Φ O hh Φ F- HS CQ πr s: Φ Hi Φ 3 tr φ Di CQ πr

3 Φ πr tr H] ei * Ö φ CQ Φ Φ F ¹ φ F- 3 hj <! rt c N HS Φ Di Φ rt

Φ CQ h- ^J F ¹ F- Φ Di Hi TJ Di CQ O Ω F- 0 πr πs co hh ≤ hj F- CQ

3 hi Φ F- SD F ¹ πs F- Φ Φ φ 0 = F- Ό ^? R rt SD hj SD = Di F- C "• CQ Φ Φ Φ Φ CJI

F- hh CQ Φ C CQ ö Ω 3 F F- hi Φ Φ Φ 0 Φ c tr i— 'Ω hj 0 HS Hj F-

0 Φ Gö h tr Φ φ πr Φ Ω rt F- hj Ό hh rt SD π s; s: tr ¹ fU = Hi hj F hj rt Φ φ hj hj Φ ö Hl πr tr ¹ CQ 3 Ό rt Φ CQ h- 'φ F- F- N SD rt Φ

0 Di SD: Hl hj O hj (D N Φ F- SD rt F- i— '3 Di rt Φ CQ hj Φ πs Φ C CQ *> CQ

Ϊ φ rt CQ Di Φ hi s rt ≤ Ω CQ - rt p: Φ F- F- πr Hl Ϊ 0 Φ

0 hj F- Φ F- F- F- H Φ Φ rt πr Φ rt HS> ¹ hj 3 HS N Φ Φ Di hj o

HS t Ω rt Hl HS hj Φ Φ Di Φ CQ h-> Φ 3 Φ φ F- Öd F- Di Di F- rt F- πr Φ CQ rt hj -> rt rt Hl i φ rt CQ rt HS Hi rt φ F- Φ HS Φ Ω hi Ω φ F φ 0 hj φ Φ hi rt σ Φ Φ SD Φ rt CQ rt HS C hj πr

0 πr F- HS CQ CQ CO? Φ SD =? Ö SD hi Φ Φ hi CQ O Hi ^ J Hj CQ hj hh F- Hi φ φ HS SD rt rt Φ 0 F- CQ F- Φ CQ Di HS • Hl Φ F- F- SD ^ F- 0 HS CQ 2 Hj

Hi Ω Φ φ HS πs HS Φ ω hh φ 3 SD c SD hj ^ Hl h- ^J CQ φ hj F- HT

Φ N πr CQ rt j rt Φ F- i ö πr rt SD: F- CQ φ rt tr 3 D. NH) Φ hi <s: H h- ¹ 0 hj F- hj Di Hi SD SD Φ F- rt ( D πs Φ Φ SD F- CC F-

0 φ Di Di rt hj 0 3 F ¹ F- Φ φ C c rt πs <Hi CQ Hj Dd 3 i rt φ rt rt

H 3 F- Φ Φ Φ h- ¹ Hi Hl hi H CQ Φ D. t Φ Ό F- φ F- W F- CQ

F> rt 3 Hi HS H t- ^J S CQ N Hl φ F- hj Hj HS c CQ 0> SD Φ CQ

HJ Φ rt O φ F- φ Φ ≤ 3! Φ Hl 0 = s: HS F- πr 3 Hi c Di Hl ^

SD F- hj M F- *> hj CQ F- Φ F- HS SD 5 ^> <πs F- F- h ^J Hi φ h CO CQ F- CQ c Hl F- hh Φ Φ hi TJ πs hj πs Ω Φ φ Hi hj Φ F- rt F- SD F- S ^ ≤ S ^ Φ rt

Hl CQ H πs F- hh hj H 0 Φ Φ rt c tr HT Hj hj Φ Di HS Φ rt ts> Ω Hl Φ CQ F- Φ tr Φ CQ φ πr Ϊ F- 3 Φ rt D hh HS CQ O rt πr D. Hi CQ πs 3

Φ hj φ Ω SD hj SD 0 Ω Hl F- hi HT Φ SD c-- rt φ Φ Φ rt Φ φ ω

For s πs rπ Φ h- '<! Hi πr Hi φ Φ F- Hl πr tr Φ Hi F- SD hj C CQ CQ

Φ hj rt F- F- Hi rt Φ rt Φ F- <! HS Ω H ⁾ hi 0 φ hj C CQ Hl πr Hi 3 3

F- F- F- Φ 0 N Φ F, hj j Ω Φ πr hi F- Hl hi HS 0 ω Φ CQ Φ Hj F- rt H ⁾ hh tr HS Di Hl 0 rt πr hi 3 HS φ πs πs rt πα D hj tr ¹ F- Hi F- rt φ rt F- Φ CQ SD Φ F ". Rt CQ F- F- SD 3 SD Φ σ rt Φ rt π> rt F ¹ CQ SD CQ F-

Hl HS h- ¹ rt rt Φ SD W φ c Di Φ

Φ SD Φ F- • F- HS rt rt Φ O Φ H> πs

HS hi hi

to to HF ¹ o O

> SD _s rt CQ öd Φ hh o Di HS Di Φ σ co rt

Hi c Hi hj Ω φ F ¹ HS 0 O φ F- SU Φ c Φ Φ

N hh F- (D πr F- F ¹ rt hj CJI to CQ Φ Hl Hl (D hj Hi

SD CQ HS CQ hj CQ 3 - 3 CQ Ω CQ CQ πr Φ rt Φ F- Φ SD ^• d SD φ Φ> CQ Hj rt πr 0 F- i— ^■ rt Hi rt hi tr hj rt rt Hl Hl F- hj HS

Φ O rt Hi CQ φ F- Ω rt N πs F- CQ Di

<F- φ C ω 0 φ Ω 0 ω SD 0 CQ Di F-

0 h- ¹ Hl HS F- ¹ HT HS • • πr Di φ Φ Φ tr D.

HS rt CQ Di => CQ Φ φ σ Φ hi πs Φ F-

0 F- hj CQ HS tr F- O ü hj Ό <ϊ tr ¹ hj Φ

3 F Di hj Φ rt Di Φ φ SD SD hj F- SD φ

F- α CQ 0 Di F- Φ Φ rt CQ CQ φ * J F- h CQ Ω HS

H! Φ hj Ω Hi Hl hj <hj SD Hl F- Φ πr (D

C hj rt Di πr - SD = 0 HJ ϊ = Di rt N Hl Ω rt O F- Φ ö CQ 3 F- F- h F- F- Di Φ πr

F- 3 s: Φ 3 SD tr rt HS HS Φ c CO Φ Φ rt

Φ F- F- Φ rt Φ 3 CQ CQ CQ C ^Q φ hj hj Φ <

Hi X CQ F- ≤> Φ F- F- F- CQ CQ rt C ^Q πs tr Hl Φ

^ hj rt rt F- tr Hl HS Φ Φ CQ Φ CQ SD 2 hj

0 Φ πs CQ CQ πd CQ hj CQ CQ φ CQ 0 hj F- O SD ü Ϊ F- Hj Ω SD Φ CQ 0 3 3 3 hj πs hj hj

F- 0 Hi <Φ πr rt Hj Φ Φ Φ rt Φ c rt tr

Φ Hl Φ F ¹ N CQ 0 Hl HS Φ Hi F ¹ ö rt Φ Φ rt SD hj F- C 0 SD Hl rt rt rt O F- F- F-

F- hj Ω SD HS κ7><! HS 3 ei ^¬ Φ Φ Φ Di π

Hl 0 πr hj Hi Φ SD rt ns ≥; ≥: rt N Hl Φ C rt tr 0 Di hj h- '0 hj Φ Φ hj Hl φ F- CQ F-> h- ¹ • HS ö F- F- F- CQ φ Φ CQ F- 3 Φ CQ to Φ CQ πs CQ 3

Di hj rt SD CQ F- F- Φ to H 3 hj rt X rt F- D.

Φ Φ Φ rt Φ Ω Φ hj F- φ Hi φ

3 F ¹ F- rt F- πr Hi t Φ Φ πs 3 SD Φ C Hj

F "Ω * 0 φ C to F ^> Hi HS c F- Ω α F- rt πr HS Φ πs HS O F> rt rt rt? Πr SD Hl F- co

Φ Φ O Hi CQ O πr πr F- hj rt Hj Φ F- hj Hj CQ F-SD. Φ SD: SD: Φ 0 CQ HS CQ

3 Φ HS rt hj HS rt F- Hl

SD F- 0 Φ Φ ü 3 rt rt 0 0 φ Hl SD

Ω rt Hj SOi Hl hj F- F- F- Hi Hl CQ Φ πr rt Φ SD Φ rt N Di Hl rt N Φ CQ φ rt Φ SD = CQ M n CQ rt = ^> Hi Hl hj Φ C hj h- ¹ co Ω Di πr Φ Φ φ Φ Φ 0 Hl Hi SD Hj Di

CO rt φ πr r ¹ Φ F- h- ¹ F- F- Hj h- ¹ rt CQ tr F- Φ

Φ X φ Φ Hl O ≤ rt πr - ¹ hj Di πs CQ

CQ Di rt CQ rt F- Φ 3 3 SD Φ F- Di F CQ

3 F- 0 Di φ F- SD hj F- F- hj CQ φ c Φ Hj

Φ Φ hj φ CQ h hj ü Dd Hl H) tr Ω hj Ω Hj F-

Hl Φ CQ φ F- rt Hl c: (^ H πr SD HS rt ι_ι. Hl hj Ϊ φ 3 rt rt rt Φ Φ> tr CQ

Φ Φ CQ Hj SD = SD F- hh F- F- F- c πr Di Φ s: Φ F- ci ^¬ rt F »rt Φ Φ Φ HS Φ Dd hh F- hj Hi h- ^■ Φ CQ HS F- F ¹ hj Hi Hl Φ Hj πs CQ Hl c Ό

F- F- 3 CQ to 0 φ Hl 3 rt F- hj Ω hj

Φ F ¹ Φ Φ HS F- F- C F- hh Ω Φ F-

CQ F- Hl Hj c- ω 3 Hi HS ι_J. et Φ πr F- CQ HS rt CQ rt tr φ CQ Φ rt hj rt Ω • rt

, Φ Φ φ S *> 3 CQ - ^ Di Φ πr hj o F- Φ SD Φ 1 3 HS HS rt c HS hh

to t F ¹

CJI o CJI o o to i

Φ to CQ

F ¹

hj

F- to πs

F ^> Q

Φ

SD Hi

HS Ό hj

D- F-

Φ HS

HS rt

3 CO

F- Φ

X Hl hj CQ

0 0

X hj

0 CQ

Hi rt F ¹ hj O

0

Φ

F "

Φ 3 • o hj F- rt to rt

O Φ

Di rt

Φ Φ

CQ s; tr ¹ F-

Φ HS Q

Φ φ

CQ

Φ F- hj HS

SD = hh rt 0

CQ hj

3 t SD

, rt

F- ö O

F- Hi φ

CQ

Φ

is compared there with the stored angle reference data in a step 37. If no match is found in step 37, the reader aborts the process (step 38). If the reading device 2 ascertains sufficient agreement in step 37 of the determined and stored angle data, a release signal is generated on line 22 in step 39. The processing device protected by the security system is thereby activated for the user. The angular information determined by the chip card is only stored in a volatile manner in the microcontroller 11 of the card 1. If the supply voltage provided by the reader 2 for guiding the data carrier 1 is switched off, the card loses this angle information after a few seconds (step 40).

It is advantageous that, in the case of lower security requirements, the reading device can already release it after step 35. A transfer of the angle data to the reader is then no longer necessary.

Claims

claims

1. Security system comprising: - a central unit (2) with a biometric sensor

(10) for determining biometric data which represent characteristic biometric features of a person,

- at least one mobile data carrier (1), - a storage device (111, 21) for storing biometric reference data, which represent biometric reference features for the person, in the system,

- A control device (11, 20) to generate a release signal for controlling a functional unit as a function of a comparison between the biometric data determined by the sensor (10) and the reference data, characterized in that the biometric reference data from a first and a second part are formed and that the first part is stored in the data carrier (1) and the second part in the central unit (2).

2. Security system according to claim 1, so that the biometric sensor (10) is designed to determine characteristic elements of the fingerprint of a finger of the person.

3. Security system according to claim 2, characterized in that the biometric sensor (10) is designed to as the biometric data to determine the local position of minutiae (101, ..., 105, 106, ..., 108) of the fingerprint ,

4. Security system according to claim 3, so that the biometric sensor (10) is designed to determine the biometric data as a distance relative to a reference measuring point and an angle relative to a reference measuring direction.

5. Security system according to claim 4, characterized in that the first part of the reference data comprises data values representing the distance of minutiae (101, ..., 105, 106, ..., 108) of the biometric reference data from a reference point, and in that the second part of the reference data comprises data values which represent the angle of the minutiae (101, ..., 105, 106, ..., 108) of the biometric reference data relative to a reference direction, or vice versa.

6. Security system according to claim 5, characterized in that for determining the biometric data related to a reference point concentric ring segments are provided, that the biometric sensor is designed to determine distance data values that the respective number of minutiae lying in the distance sections (101, ..., 105) of the person represent that the biometric reference data comprise predetermined distance data values which represent a respective number of minutiae of the biometric reference data lying in corresponding concentric ring segments, and that the determined distance data values are compared with the predetermined distance data values in order to obtain the release signal produce.

7. Security system according to claim 5 or 6, characterized in that angle segments are provided for determining the biometric data, that the biometric sensor is designed, win- to determine key data values which represent the respective number of minutiae (106, ..., 108) of the person lying in the angle segments, that the biometric reference data comprise predetermined angle data values which represent a respective number of minutiae of the biometric reference data lying in corresponding angle segments, and that the determined angle data values are compared with the predetermined angle data values of the reference data in order to generate the release signal.

8. Security system according to claim 7, characterized in that the predetermined distance data values are stored in a non-volatile manner in a memory (111) which is arranged on the data carrier (1) and that the sensor (10) is arranged on the data carrier (11) ,

9. Security system according to claim 8, so that the predetermined angular data values are stored in a memory (21) which is arranged in the central unit (2).

10. The method according to any one of claims 1 to 9, d a d u r c h g e k e n n z e i c h n e t that

- the biometric data values are determined from the data carrier (33),

a part of the determined data values is compared with the first part of the biometric reference data stored on the data carrier (1) within the data carrier (1),

- If the comparison is fulfilled, another part of the determined data values is transmitted to the central unit (2)

(36), - the transmitted other part of the data values is compared (37) with the second part of the biometric reference data stored in the central unit (2),

- and if the comparison is satisfied, the release signal is generated (39).

11. The method according to claim 10, characterized in that the distance data values and the angle data values are determined from the data carrier (1), that the distance data values are compared with the predetermined distance data values stored on the data carrier (1) and if the comparison is satisfied, from the data carrier (1) the determined angle data values are transmitted to the central unit (2), that in the central unit (2) the transmitted angle data values are compared with the stored predetermined angle data values in order to generate the release signal when the comparison is satisfied.