EP2452319A1

EP2452319A1 - Method and device for authenticating components within an automatic teller machine

Info

Publication number: EP2452319A1
Application number: EP10725684A
Authority: EP
Inventors: Volker Krummel; Michael Nolte; Matthias Runowski
Original assignee: Wincor Nixdorf International GmbH
Current assignee: Wincor Nixdorf International GmbH
Priority date: 2009-07-08
Filing date: 2010-06-16
Publication date: 2012-05-16
Also published as: DE102009032355A1; WO2011003712A1; CN102511057B; US20120102327A1; CN102511057A; US8898462B2

Abstract

The invention relates to a device and a method for authenticating components of an self-service automatic teller machine, wherein the components comprise unambiguous identification information that can be exchanged among the components, wherein an authentication of the components and/or the information exchanged between the components is carried out by the encryption and/or signature of the information on basis of identity based encryption (IBE) that uses the identification information of the components.

Description

Method and device for the authentification of components within an ATM

A method for authenticating components of a self-service machine, the components having unique identification information that is interchangeable among the components.

Field of the Invention: Self-service (SB) machines often have a number of components to be interconnected. As a rule, these machines have a standardized PC platform that meets special security requirements. On this PC platform (motherboard), for example, via USB interfaces, keyboards, payoff units (banknote divider module), card readers, monitors, and other devices are connected. It should also be noted that ATMs are inserted into ATMs that are to be authenticated or that the ATM has to authenticate to the cartridge in order to enable it to function. Furthermore, the e _^ machines include the ability to connect rrn another computer, a tung Wa L-Ingenicur damic, for example, with his laptop can connect to the self-service machine.

In the preferred embodiment, UJB or other serial (V24) links are used to interconnect the devices.

Cs are cases in which a safety-relevant component m should be replaced by an oB-automaton, in the following abbreviation automaton. Such a component could be a hardware module such as a cashbox sr-m, but also a software component such as a cashbox. Firmware update, or even peripheral devices as they were above beschneben. Crucial to this process is that the ATM (PC) is authenticated to the new component or the ATM can verify the authenticity of the component. Only after successful authentication does the new component perform its service.

In this scenario, the following classic approaches exist for authentication:

1) The component and the ATM have a common confidential key. Here is the Schi usselverwaltung either very expensive odei but it is the same key for many ATMs used.

2) The component itself is signed by a CA or has simulations that allow it to ileipi digital signatures or certificates. Also in this case, a classic PKE must be managed.

Evil looks over the invention: The object of the invention is to provide an alternative authentication that does not have the disadvantages of the approaches described above. The object is achieved by a method and a device having the features of the independent claims.

The invention describes a new approach to o.g. Problems The approach of the invention is based on a clever use of the so-called iden matic terbased cryptography (IBE). Here, public unique information such as e.g. a serial number used as a public key. The money certificate, equipped with all necessary parametres, demands the public information of the component. From this information, he can use the parameters to create a signature that the component can check with its public information. This method can also be combined with a challenge-response method, counters, or other methods to prevent replay attacks.

For the IBE basis reference is made to the literature attached. As the term Identity Based Encryption (IBE) indicates, IBE encryption is encryption based on the identity of the user or device. For de c encryption, IBE encryption does not use a cryptic number key but the identity of a recipient. This has the advantage that the recipient does not have to remember a long payer code but can use an agreed identity feature such as his date of birth, the telephone number or the e-mail address as the public key. In this technique, in which the Message rai L of an identity is encrypted and, the key manaqem is omitted.

The basic idea is that a central "private key generator (PKG or CA)" also creates a private and a public key (skPKG, pkPKG). The pkPKG key is provided to anyone who receives the encrypted message The sender knows the identity of the recipient and uses the message LusselL under 0 empi and p] PKG This message can then be decrypted duich skidempf The current approaches are based on elliptic curves, Pur Detai_ls is referred to the mentioned literature, it goes without saying that this approach also applies to the signature of

Ib information can be used. In this case, the data is signed with the private key and the signature ubeipiπf t with the identity and the public key (empf, pkPKG).

When using the present invention, two components within the self-service machine check themselves based on a detectable Idertatat. As identity, e.g. the line number, network number (MAC) or other unique identifiers prades t imecL. In principle, the choice of the

25 Identification Consistency.

Now with the identity and the keys one can

Encryption or one of the most favorable export conditions

Signing done so that an authentication of the components can be made

30 When the signature is received, for example, the component B of the loruponente A a Senennummer. Component A sends a defimeric Hachπchc that is signed (with a pnvdLen Key derived from the serial number (ISL) at component B, which identifies the serial number and the public key, 1 then checks the signature Em Ansät? consists, for example, of the signature dei Sericrmummej_

Tn an alternative Ausfuhrungs i oira a known information is encrypted VCJ Hieibei can be e _^ z. B act for the sezernummi himself. G iat transmits a message to Geiat Λ Encrypt a message, for example the key sumi itself, with the key borrowed and the key number and sends the message to component B, which decrypts the trailing key and checks whether the decrypted message does not match the current page number

In a preferred embodiment, in addition to the senunary agreement, a currency is also incorporated, which feeds encrypted / signed information into it. If the payer is correct, this number is raised, so that a double use of a message can be avoided It should be noted that the components must not only consist of Haidware, but this can also be a software exchange Whereby the software that is exchanged, signed or encrypted Wnd

In a possible further ^Q "APPROACH ei / altet a Servei dαC private key of each client and signed the Nachiichcen he sends to a client, private with the respective

Key of the client The client wiedeium can

Signature, since he is his official

Implicitly by using semei identification and. It is also possible that the ti πl tion the same as the public key is integrated, so that it linen / ugrxf-L or an interpretation of the offerit Liehen conclusion requires a combination of these two informations] ann In this case, it is a learned way to use a symmet ribchc cryptography, since the client does not know "his" pπvai en key qai Variant offers logistical advantages, since client -> rrut can be personalized to the exact same data

The so-called Servei can be placed in a terminal form directly in the / ATM as a "small" CA.

Now, if a new cash register / Ge LdI asset te or component m should be operated geiat, the cassette should be able to dxe verify the authenticity of 7ATMo. For this purpose, no exchange of private locks should take place.

The new cartridge can handle its own public key and thus can check the night of the ATM, which it knows with the private key deι_ lassette, which is a CA and thus can mend it to the IBS (Identity Based Signature) scheme In the latter case, therefore, the signature is used for the cassette, the cassette having its own lid and the public public key being able to derive its own public key in order to obtain its signature Cassette assume that it is in the right Geiat, or in the right group of devices

It is also possible to use a "Challenge Kesponse" method. If, for example, the number of units is requested by the components, then there must be a correct antwoit

It is also possible to use the verb / ndndunα \ JΠ ^D αSb Oiteni e n n oel cirmker

Approach that can be exchanged in advance / ° <can do so For example, a passport location may be required when asking for the serial number.

This results in a number of advantages. 1. The solution simplifies key management and avoids the need for a sophisticated PKI.

2. The signatures are customizable for each authentication and therefore not abusive to other authentication processes.

3. The solution is resistant to attacks with known messages.

4. The components do not need to be personalized with confidential information.

5. The solution may work on systems with limited resources, such as Cash cassettes, smart cards, etc., to be implemented.

Figures Description

In the following the figures are described, to which the de detailed description below refers.

It shows:

Fig. 1 shows a layer model of authentication, with a CA (Certificate Authority), an ATM (ATK) and an L cashbox, the cassette authenticating the machine to issue money.

2 shows a layered model of the authentication with a

CA and an ATM, wherein a signed firmware is passed.

Embodiment of the invention The figure shows a layer representation of the present invention. The CA in possession of the two master keys creates a public key IBSp accessible to all components and a private key IBSs for each component generated by the master key taking into account the serial number of the component , The private key, since it was generated based on the ATM serial number, is merely handed over to the ATM, the public key is handed over to all. In this case, the CA preferably manages the private keys of the ATMs and the ATMs the private keys of the cash boxes so that the private keys of the cash boxes are not distributed with the cash boxes. Through this approach, it is possible for the CA to make software updates on the ATMs and for the cash boxes or ATMs to detect the legitimacy of the cash boxes or ATMs.

Now, if the cashbox is fed into the ATM, the

Check the cashbox to see if this is an approved ATM. In an alternative embodiment, this can also be reversed, i. the ATM checks the cashbox. In order for the ATM to create a signed message, its contents can be checked by the cashbox and there will be both a counter and the

Replaced serial numbers. The ATM now signs the message consisting of counter and serial number with the IBSs

Key (alternatively, of course, a

Encryption on the basis of the IBSp and the serial number), and sends this message to the cassette, which then checks the message against the serial number of the ATM and the IBSp (in the case of encryption, the private

Key of the cassette worked, which is not shown). If the check is successful, the counter is raised and the function of the cassette is activated.

Fig. 2 shows an alternative embodiment of the present invention. The ATM should receive new software. This software is provided by the CA, in this example a Challenge Response method is described. The CA asks the ATM to download the sotware. The ATM then counters the CA by offering to deploy the software. The CA provides its serial number and a signed firmware including a previously notified meter. The ATM verifies the signature using the CA's public key and serial number. If the verification of the signature and the counter were successful, the machine will be updated. In case of failure, the firmware is rejected

Literature list

1 . Adi Shamir. Identity-Based Cryptosystems and Signature Schemes. Advices in Cryptology Proceeds of CRYPTO 84, Lecture Notes in Computer Science, IA-

-53. 1984

2. Dan Boneh, Matthew K. Franklin. Idcntity-Based Encryption from the Because Pairing Advice in Cryptology - Proceedings of CRYPTO 2001 (2001)

3. Clifford Cocks, An Identity Based Encryption Schcnie Bascd on Quadratic

Residues., Proceedings of the 8th IMA International Conference on Cryptography and Coding, 2001

4. SS Al-Riyami, KG Patcrson Certilateless Public Key Cryptography Λdvances in Cryptology - Proceedings of JΪS1 ACRYPT 2003 (2003)

5. Joonsang Back, Jan Newmarch, Safhani-Naini, and Willy Susilo, A

Survey of Idcntiy-Bascd Crypthography. School of Information Technology and

Computer Science, University of Wollongong

Claims

claims

1. Method for authenticating components of a

Self-service machines, where the components are unique

Identifika t Lonsin have forma tions that are interchangeable among the components,

'in which ,

An authentication of the components and / or the InEonnari ones between the components

be replaced by encryption and / or

Signature of the information based on the Identity Based Encryption (IBE), which is the

Identification information of the components used. 2. The method according to the preceding claim, wherein the identification information from one or

several of the following information exists:

Electronically readable serial numbers, bus identifier, network identifier.

3. The method according to one or more of the preceding claims, wherein in addition a counter is exchanged between the components, which is taken into account in the signing or the encryption, and is preferably part of the signing or encryption.

4. The method according to the preceding claim, wherein the counter is set high in a successful authentication and thus the signed or encrypted messages can not be used multiple times.

5. The method according to one or more of the preceding claims, wherein additionally a Chal Lenge response method of the signature or encryption is preceded.

6. The method of the preceding claim, wherein the challenge-response method is a password query before the identification information is provided.

The method of one or more of the preceding claims, wherein the self-service machine is an ATM and a component is a cashbox to which the ATM must authenticate before the cashbox begins operation with the ATM.

8. The method according to one or more of the preceding claims, wherein a new software to be installed on the self-service machine is encrypted and / or signed by a central office, and then to send them to the self-service machine, the the software decrypts and / or verifies the signature before the software is installed.

The method according to one or more of the preceding claims, wherein the central office manages the private keys of the components and / or the self-service machines, and forwards the information encrypted to them.

10. The method according to the preceding claims, wherein the central location is located in the self-service machine, and manages the private keys of the components so that the components can authenticate when connected to the self-service machine.

11. SB machine, which consists of at least two components

is constructed, wherein the components one

Memory area, where unique

Identification information is stored, which are interchangeable among the components,

with a processing unit in at least one of the components, which is set up and equipped such that an authentication of the other components and / or the information between the

Components are exchanged by encrypting and / or signing the information based on the Identity Based Encryption (IBE) that the

Identification information of the components used.

12. The self-service machine according to the preceding claim, wherein the Identifika tioninforrtia tions in the memory area from one or more of the following information

consist of: electronically readable serial numbers, bus ID, network ID.

13. The self-service machine according to one or more of the preceding claims, wherein additionally in a further memory area, a counter is stored, which is exchanged between the components, which takes into account in the signing or encryption w] cd, and joi zuqs.iei se Te31 of the signing or writing isL.

14. The self-service machine according to the preceding claim, wherein d ± e Bea] is so embodied and designed in processing that the pay. is set high on a successful iulhent ication, and thus the signed or encrypted information can not be used.

Ib. The SB-AuLomaL according to one or more of the preceding SB-Automalen-claims, wherein the

The processing unit is emgeiichtet and trained so that in addition a challenge-response method of the signature or encryption is preceded.

16. The self-service machine according to the preceding claim, wherein the challenge-response method is a password query, bevoi the IclenLif] cation information is provided.

17. A self-service machine according to one or more of the preceding claims, wherein the self-service machine is a cash dispenser (ATM) and a component is a cashbox to which the ATM has to authenticate before the cashbox begins operation with the ATM. 18. SB-Putomac according to one or more of the preceding claims, wherein a new software to be installed on the SB-Automateα is encrypted by a potential location and ⁷ or signed to it then to send to the SB-Autornat, wherein the processing unit is set up and configured so that the software is decrypted and / or the signature is checked before the software is installed.

19. A self-service machine according to the preceding claim, wherein the central office managed the private keys of the components and / or the self-service machines, and the En iϊorma t ions forwarded encrypted to these, and on the components and / or the self-service machines only the public keys can be determined to verify the signature. 20. The self-service machine according to the preceding claim, wherein the central point is arranged in the self-service machine, and manages the private keys of the components in a memory area, so that the components can authenticate when connecting the self-service machine.