Classifications

• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
  • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
  • G06F21/31—User authentication
  • G06F21/33—User authentication using certificates
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
  • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
  • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
  • G06F21/31—User authentication
  • G06F21/34—User authentication involving the use of external additional devices, e.g. dongles or smart cards
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L63/00—Network architectures or network communication protocols for network security
  • H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network
  • H04L63/061—Network architectures or network communication protocols for network security for supporting key management in a packet data network for key exchange, e.g. in peer-to-peer networks
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L63/00—Network architectures or network communication protocols for network security
  • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
  • H04L63/0823—Network architectures or network communication protocols for network security for authentication of entities using certificates
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L63/00—Network architectures or network communication protocols for network security
  • H04L63/16—Implementing security features at a particular protocol layer
  • H04L63/166—Implementing security features at a particular protocol layer at the transport layer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L63/00—Network architectures or network communication protocols for network security
  • H04L63/16—Implementing security features at a particular protocol layer
  • H04L63/168—Implementing security features at a particular protocol layer above the transport layer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
  • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
  • H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
  • H04L9/0869—Generation of secret information including derivation or calculation of cryptographic keys or passwords involving random numbers or seeds
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
  • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
  • H04L9/3234—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving additional secure or trusted devices, e.g. TPM, smartcard, USB or software token
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
  • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
  • H04W12/043—Key management, e.g. using generic bootstrapping architecture [GBA] using a trusted network node as an anchor
  • H04W12/0431—Key distribution or pre-distribution; Key agreement
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
  • H04W12/06—Authentication
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L2463/00—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00
  • H04L2463/061—Additional details relating to network architectures or network communication protocols for network security covered by H04L63/00 applying further key derivation, e.g. deriving traffic keys from a pair-wise master key
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L63/00—Network architectures or network communication protocols for network security
  • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities

Definitions

• the present invention generally relates to security mechanism for an external code provided by an application web server.
• the invention relates particularly, though not exclusively, to how a server, a phone browser and an operating system may enable secure usage of cellular based credentials from a browser via the external code, such as JavaScript code.
• Scripting commands within web content such as an HTML document, written in JavaScript or a similar scripting language, are used.
• Scripting commands executed on a PC-based browser may generate some or all of the information content available to a user of the PC-based browser.
• the new multimedia capable mobile terminals provide an open development platform for application developers, allowing independent application developers to design new services and applications for the multimedia environment.
• the users may, in turn, download the new applications/services to their mobile terminals and use them therein.
• interaction of a security management module of the mobile terminal with an application web server is important for the overall security.
• An improved solution for using the security management module of the mobile terminal, for web content comprising external code, such as JavaScript, retrieved from an external source, is needed.
• a method for providing a security mechanism for an external code comprising:
• Ks_NAF server specific bootstrapping key
• NAF-ld determining a server identifier (NAF-ld) and generating the server specific bootstrapping key (Ks_NAF) based on the server identifier (NAF-ld);
• KsJs_NAF an external code specific bootstrapping key
• KsJs_NAF external code specific bootstrapping key
• the method further comprises determining the security token using a first random challenge (RAND1 ) and a second random challenge (RAND2).
• the method may further comprise transmitting the second random challenge (RAND2) and the external code specific bootstrapping key (KsJs_NAF) to an application server for validation of the external code specific bootstrapping key (KsJs_NAF).
• a response external code comprising the second random challenge (RAND2) and the external code specific bootstrapping key (KsJs_NAF) may be transmitted.
• the method further comprises:
• Ks_NAF server specific bootstrapping key
• JS-GBA-API application programming interface
• Ks_NAF server specific bootstrapping key
• JS-GBA-API application programming interface
• KsJs_NAF external code specific bootstrapping key
• a transport layer security (TLS) tunnel may be established between a browser application of an apparatus and an application server.
• the server identifier (NAF- Id) may be determined including a domain name (FQDN) and a security protocol identifier.
• the security protocol identifier may be formed using a ciphersuite of a transport layer security (TLS).
• the method further comprises generating the external code specific bootstrapping key (KsJs_NAF) with a key derivation function.
• the external code may comprise a JavaScript code.
• the method further comprises determining the security token using a transport layer security (TLS) master key.
• TLS transport layer security
• an apparatus comprising:
• Ks_NAF server specific bootstrapping key
• NAF-ld server identifier
• Ks_NAF server specific bootstrapping key
• KsJs_NAF server specific bootstrapping key
• KsJs_NAF external code specific bootstrapping key
• the security token may be determined using a first random challenge (RAND1 ) and a second random challenge (RAND2).
• the at least one memory and the computer program code being further configured to, with the at least one processor, cause the apparatus at least to:
• server identifier NAF-ld
• JS-GBA-API application programming interface
• Ks_NAF server specific bootstrapping key
• JS-GBA-API application programming interface
• Ks_NAF server specific bootstrapping key
• JS-GBA-API application programming interface
• KsJs_NAF external code specific bootstrapping key
• JS-GBA-API application programming interface
• the server identifier may be determined by including a domain name (FQDN) and a security protocol identifier.
• the security token may be determined using a transport layer security (TLS) master key.
• a computer program embodied on a computer readable medium comprising computer executable program code which, when executed by at least one processor of an apparatus, causes the apparatus to:
• Ks_NAF server specific bootstrapping key
• NAF-ld determines a server identifier (NAF-ld) and generate a server specific bootstrapping key (Ks_NAF) based on the server identifier (NAF-ld);
• KsJs_NAF server specific bootstrapping key
• a method for providing a security mechanism for an external code comprising: transmitting the external code, wherein the external code comprising a request for a server specific bootstrapping key (Ks_NAF);
• Ks_NAF server specific bootstrapping key
• NAF-ld server identifier
• KsJs_NAF an external code specific bootstrapping key
• KsJs_NAF external code specific bootstrapping key
• the method further comprising:
• Ks_NAF server specific bootstrapping key
• NAF-ld server identifier
• FQDN domain name
• security protocol identifier a security protocol identifier
• the method further comprising:
• an application server comprising:
• Ks_NAF server specific bootstrapping key
• Ks_NAF server specific bootstrapping key
• NAF-ld server identifier
• KsJs_NAF server specific bootstrapping key
• KsJs_NAF external code specific bootstrapping key
• a computer program embodied on a computer readable medium comprising computer executable program code which, when executed by at least one processor of an application server, causes the application server to:
• Ks_NAF server specific bootstrapping key
• Ks_NAF server specific bootstrapping key
• NAF-ld server identifier
• KsJs_NAF server specific bootstrapping key
• KsJs_NAF external code specific bootstrapping key
• Any foregoing memory medium may comprise a digital data storage such as a data disc or diskette, optical storage, magnetic storage, holographic storage, opto- magnetic storage, phase-change memory, resistive random access memory, magnetic random access memory, solid-electrolyte memory, ferroelectric random access memory, organic memory or polymer memory.
• the memory medium may be formed into a device without other substantial functions than storing memory or it may be formed as part of a device with other functions, including but not limited to a memory of a computer, a chip set, and a sub assembly of an electronic device.
• Fig. 1 shows some details of the system architecture in which various embodiments of the invention may be applied
• Fig. 2 shows some details of the system elements, in which various embodiments of the invention may be applied;
• FIG. 3 shows a messaging diagram according to an embodiment of the invention
• Fig. 4 presents an example block diagram of an application server in which various embodiments of the invention may be applied;
• Fig. 5 presents an example block diagram of a user apparatus in which various embodiments of the invention may be applied;
• Fig. 6 shows a flow diagram showing operations in a user apparatus in accordance with an example embodiment of the invention.
• Fig. 7 shows a flow diagram showing operations in an application server in accordance with an example embodiment of the invention.
• GAA Generic Authentication Architecture
• GBA Generic Bootstrapping Architecture
• Variants of GAA GBA are standardized by Open Mobile Alliance (OMA) and CableLabs.
• GAA GBA is based on mobile algorithms AKA (Authentication and Key Agreement) for 3GPP.
• the original purpose of the GAA/GBA procedures is to authenticate user equipment or a subscriber.
• the GAA/GBA is used for improving security between an application server, a mobile terminal browser and an operating system of the mobile terminal.
• secure usage of cellular based credentials is enabled from the browser via an external code that is downloaded from a server to the user apparatus within a webpage, for example.
• the external code may comprise a JavaScript code, for example.
• GAA GBA is a multipurpose enabler that is used for example for Mobile TV and presence. By using this existing mechanism and associated infrastructure one may achieve the benefit that administrative costs and the amount of investment that needs to be made may be reduced.
• an application server may be a web server providing a web service for a user.
• the application server may also be untrusted by the network operator and comprise a network application function (NAF).
• NAF network application function
• Fig. 1 shows some details of the system architecture 100, in which various embodiments of the invention may be applied.
• the system comprises a user apparatus, such as a user equipment (UE) 1 10, and an application server 120 providing web service(s). Additionally the system comprises a bootstrapping server function (BSF) 130 and a subscriber database 140, such as a home subscriber server (HSS) or home location register (HLR).
• the apparatus 1 10 further comprises a GBA (Generic Bootstrapping Architecture) function block 150 configured to co-operate with the bootstrapping server function (BSF) and a network application function (NAF) client 160 configured to co-operate with the application server 120.
• the network application function (NAF) client may comprise for example a browser.
• the application server 120 may be administered by a different party compared to the bootstrapping server function (BSF) 130 and subscriber database 140, or they may be administered by the same party (which is typically the operator of the communication network in question).
• BSF bootstrapping server function
• a generic bootstrapping server function (BSF) 130 and the user equipment (UE) 1 10 shall mutually authenticate using the authentication and key agreement (AKA) protocol, and agree on keys that are afterwards applied between user equipment (UE) 1 10 and a network application function (NAF) of a server 120.
• the network application function (NAF) is a functional module located in the service providing server 120.
• transport layer security (TLS) and legacy authentication may be used.
• GBA Generic bootstrapping architecture
• HBA hypertext transfer protocol
• SIP session initiation protocol
• Main functions of the network application function (NAF) module of the server 120 are service/user management (e.g., service subscription and unsubscription) and service key management (e.g., service key generation and delivery).
• the bootstrapping server function (BSF) 130 shall restrict the applicability of the key material to a specific network application function (NAF) of a server 120 by using a key derivation procedure.
• the key derivation procedure may be used with multiple network application functions (NAF) during the lifetime of the key material.
• the lifetime of the key material is set according to the local policy of the bootstrapping server function (BSF) 130.
• the bootstrapping server function (BSF) 130 is allowed to fetch any required authentication information, security information and subscriber profile information from a home subscriber system (HSS) 140.
• the bootstrapping server function (BSF) 130 may interact with the home location register (HLR) instead of the home subscriber system (HSS) 140.
• HLR home location register
• the external code may be downloaded to the user apparatus and the concern may be that the secret of the GBA module is sent to the web server as-is.
• Fig. 2 shows some details of the system elements, in which various embodiments of the invention may be applied.
• the external code may comprise any code downloaded to an apparatus and potentially used or executed locally.
• the external codes may be executed in installed applications, such as browsers or widgets, for example.
• One example of external codes is JavaScript code.
• JavaScript code For simplicity, the following example embodiments are described using the JavaScript but the embodiments are not limited to JavaScript and any external code may apply.
• JavaScript may be used in the form of client-side JavaScript processed in a user equipment (UE) 1 10.
• Running JavaScript 280 may be implemented as part of a web browser 210 in order to provide enhanced user interfaces and dynamic websites. This enables programmatic access to computational objects within a host environment.
• the JavaScript 280 may be also used in applications outside web pages, for example in documents, site-specific browsers, and desktop widgets. JavaScript is also used for server-side web applications.
• An application programming interface (API) is a particular set of rules ('code') and specifications that software programs can follow to communicate with each other. API serves as an interface between different software programs and facilitates their interaction.
• a GBA API may be created, named as JS-GBA-API 220 in Fig.
• the browser 210 of the user equipment (UE) 1 10 may communicate with a network application function (NAF) server 120 operating as an application service server for web content, for example.
• the network application function (NAF) server 120 may comprise a GBA NAF module 250 and a server application 260, for example.
• the interaction of a user apparatus security management module (GBA module, that is part of the OS) with an application web server is provided.
• the security mechanism enables a secure usage of the security management module 240 from a browser 210 with JavaScript 280 coming from an external source 120.
• Ks and NAF specific keys derived from the Ks When referring to GBA keys, the following keys are intended: Ks and NAF specific keys derived from the Ks.
• Ks_ext/int_NAF in GBA U context
• Ks NAF in GBA_ME context
• Ks_ext_NAF is the same key as Ks_NAF, i.e., the NAF specific key used in the ME.
• the Ks_ext_NAF is derived in the UlCC in GBA_U context and given to the ME
• Ks_NAF is derived in the ME in GBA_ME context. They may be both used the same way in the ME regardless of the context.
• the Ks_int_NAF is derived in the UlCC and it is used in the UlCC.
• the Ks_int_NAF is never given out from the UlCC.
• KsJs_NAF key the JavaScript key for the JavaScript code and the application server used instead of Ks_NAF or Ks_ext_NAF is intended.
• the UE and the network application function (NAF) first have to agree whether to use the GBA.
• a UE When a UE wants to interact with a network application function (NAF), but it does not know if the network application function (NAF) requires the use of shared keys obtained by means of the GBA, the UE shall contact the network application function (NAF) for further instructions.
• Fig. 3 shows a messaging diagram according to an embodiment of the invention. Not all messages and items showed, need to be performed, order of messages may vary, and more messages may be performed, not limiting to those messages and items showed in Fig. 3.
• a user apparatus such as a user equipment (UE) may start communication over reference point Ua with an application server, such as network application function (NAF) server without any generic bootstrapping architecture (GBA) related parameters.
• GBA generic bootstrapping architecture
• a web browser 210 is considered to be a trusted application in the sense that a user trusts the browser 210 to handle security related functions properly and not leaking sensitive information like passwords to third parties.
• the web browser 210 is divided into three functional blocks: An engine module 310, a JavaScript module 320 and a GBA-API module 330.
• the engine module 310 handles basic functionalities for the web browser 210 like setting up transport layer security (TLS) with web servers 120, downloading web resources, and providing user interface information for the user.
• TLS transport layer security
• the GBA API module 330 offers the application programming interface (API) towards any JavaScript code executing in the web browser 210.
• API application programming interface
• the web browser 210 and the GBA API 330 should not reveal any sensitive information to the JavaScript, nor should they accept any sensitive information from the JavaScript more than necessary.
• the JavaScript module 320 executes the downloaded JavaScript. Any JavaScript code executed in the web browser 210 should be considered not trusted and should not be granted access to sensitive resources or the access to such resources should be controlled.
• the depicted sequence flow diagram of Fig.3 may be executed within a server authenticated transport layer security (TLS). Also, the web browser 210 may be in the process of downloading a html page, in which one of the linked JavaScript resources is called "gba.js".
• TLS transport layer security
• the browser application 210 and the web server 120 establish a server authenticated transport layer security (TLS) tunnel.
• TLS transport layer security
• a content download is requested by a browser application 210 of a user apparatus, such as a user equipment (UE).
• the content may be, for example a web page provided by an application server 120, such as a web server.
• the request of item 1 may comprise for example a HTTP request.
• the web server 120 dynamically constructs the JavaScript code "gba.js" file by generating a server random challenge (RAND1 ) that is to be included to the JavaScript code and provided to GBA API 330 of the browser 210.
• the RAND1 is also locally stored in the web server 120.
• a JavaScript GBA application programming interface (API) 220 may be used to request and obtain a JavaScript specific GBA key (KsJs_NAF).
• KsJs_NAF JavaScript specific GBA key
• a random challenge RAND1 is included in the GBA API request in item 2.
• the JavaScript specific GBA key (KsJs_NAF) request may also be forwarded to the GBA module 240 when received at the browser 210 and forwarded by the GBA module 240 to the GBA API 220 for further processing.
• the web page with a JavaScript code 280 is loaded from the server 120 in item 3, as a HTTP response, for example.
• the engine 310 of the web browser 210 starts to execute the JavaScript code "gba.js" in the JavaScript module 320.
• the JavaScript code "gba.js” comes to a point where a call to GBA API 330 is made.
• the call contains RAND1 as one of the parameters.
• the JavaScript GBA API 330 stores the received RAND1 .
• the GBA API 330 also locates the relevant information about the JavaScript code, for example what html page it is executing, from what url was the html page downloaded from, and which TLS ciphersuite is used in the TLS tunnel.
• a domain name (FQDN) of the web server (NAF) 120 may be extracted from the url of the web page, and the Ua security protocol identifier can be derived from the used TLS ciphersuite.
• the domain name (FQDN) of the NAF server 120 and the Ua security protocol identifier form the network application function identifier (NAF-ld).
• the GBA API module 330 makes a call to the GBA module 240 with the NAF-ld derived in item 6.
• the GBA module 240 bootstraps with the bootstrapping function (BSF), in case there is no valid GBA master key Ks. From the Ks a NAF specific key (Ks_ext_NAF) is derived using the NAF-ld.
• BSF bootstrapping function
• the UlCC 270 gives the CK and IK to the GBA module 240, which generates Ks from them by concatenating CK and IK, for example. Furthermore, the GBA module 240 generates the Ks_NAF using the Ks NAF-ld.
• the UlCC 270 keeps the CK and IK to itself, and generates the Ks_ext_NAF, which is then given to the GBA module 240.
• GBA_ME GBA specific functionality
• GBA_U GBA_U case part of the GBA functionality is implemented in the UlCC 270.
• Mainly Ks is kept in the UlCC 270 and only the derived Ks_(ext)_NAF is given to the GBA Module 240.
• GBA "master key" Ks is either generated in the ME (GBAJV1E case) or in the UlCC 270 (GBAJJ case).
• An application getting a required GBA key only deals with the GBA Module 240, and the GBA key is either Ks NAF in GBA_ME case and Ks ext NAF in GBA U case, respectively.
• the application may then use the GBA key Ks_(ext)_NAF, regardless of the source.
• the GBA module 240 returns the NAF specific key (Ks_ext_NAF) to browser's GBA API 330 with a bootstrapping transaction identifier (B-TID), and key lifetime, for example.
• the GBA API 330 may generate a client side random challenge RAND2.
• a security token may be determined using random challenge RAND1 and random challenge RAND2.
• a JavaScript specific GBA key KsJs_NAF
• Ks_ext_NAF server specific bootstrapping key
• a key derivation function KDF may be used to produce the JavaScript specific GBA key as following:
• KsJs_NAF KDF (Ks_ext_NAF, RAND1
• the RAND1 is the random challenge received from the server 120 and RAND2 is generated by the GBA API 330.
• the Ks_(ext)_NAF may be processed to the GBA API 330 in JavaScript level.
• the JavaScript function may be called for example GBA.getNAFKey(RANDI ) and the function then returns KsJs_NAF and RAND2.
• the GBA API 330 returns JavaScript specific KsJs_NAF key, RAND2, B-TID and key lifetime to the executing JavaScript module 320.
• the JavaScript module 320 continues, in item 12, to execute and uses the KsJs_NAF key the way web server 120 has instructed (via JavaScript code "gba.js").
• the JavaScript module 320 makes a request (e.g. HTTP request) to the web server 120.
• This request may contain at least KsJs_NAF, RAND2, and B-TID.
• the web server 120 may fetch the Ks_ext_NAF from the bootstrapping function (BSF), and then derive the KsJs_NAF with the received RAND2 and the stored RAND1 .
• the web server 120 may compare the received KsJs_NAF with the locally derived one for validation. If the received KsJs_NAF is valid, the web server 120 will continue to process the request made in item 13 and return the result to the JavaScript module 320 of the web browser 120 in item 15. Furthermore, the web server 120 may continue to execute the JavaScript code.
• the NAF specific key (Ks_NAF) is not sent to server as such, which improves the security mechanism.
• the JavaScript specific key (KsJs_NAF) is changed every time the GBA API 330 is used, because RAND1 and RAND2 are changed. Such mechanism provides further security and replay protection, for example.
• a different security token is used.
• the web server 120 selects the JavaScript code "gba.js" file to be provided to GBA API 330 of the browser 210.
• a JavaScript GBA application programming interface (API) 220 may be used to request and obtain a JavaScript specific GBA key (KsJs_NAF).
• the JavaScript specific GBA key (KsJs_NAF) request may also be forwarded to the GBA module 240 when received at the browser 210 and forwarded by the GBA module 240 to the GBA API 220 for further processing.
• the web page with a JavaScript code 280 is loaded from the server 120 in item 3, as a HTTP response, for example.
• the engine 310 of the web browser 210 starts to execute the JavaScript code "gba.js" in the JavaScript module 320.
• the JavaScript code "gba.js" comes to a point where a call to GBA API 330 is made.
• the JavaScript GBA API 330 locates the relevant information about the JavaScript code, for example what html page it is executing, from what url was the html page downloaded from, and which transport layer security (TLS) ciphersuite is used in the TLS tunnel.
• a domain name (FQDN) of the web server (NAF) 120 may be extracted from the url of the web page, and the Ua security protocol identifier can be derived from the used TLS ciphersuite.
• the domain name (FQDN) of the NAF server 120 and the Ua security protocol identifier form the network application function identifier (NAF-ld).
• the GBA API module 330 makes a call to the GBA module 240 with the NAF-ld derived in item 6.
• the GBA module 240 bootstraps with the bootstrapping function (BSF), in case there is no valid GBA master key Ks. From the Ks a NAF specific key (Ks_ext_NAF) is derived using the NAF-ld.
• BSF bootstrapping function
• the UlCC 270 gives the CK and IK to the GBA module 240, which generates Ks from them by concatenating CK and IK, for example. Furthermore, the GBA module 240 generates the Ks_NAF using the Ks NAF-ld. In GBA U case, the UlCC 270 keeps the CK and IK to itself, and generates the Ks_ext_NAF, which is then given to the GBA module 240.
• GBA_ME case all GBA specific functionality is implemented in the ME, and in GBA_U case part of the GBA functionality is implemented in the UlCC 270. Mainly Ks is kept in the UlCC 270 and only the derived Ks_(ext)_NAF is given to the GBA Module 240. In other words, GBA "master key" Ks is either generated in the ME (GBAJV1E case) or in the UlCC 270 (GBAJJ case).
• GBA Module 240 An application getting a required GBA key only deals with the GBA Module 240, and the GBA key is either Ks NAF in GBA_ME case and Ks ext NAF in GBA U case, respectively. The application may then use the GBA key Ks_(ext)_NAF, regardless of the source.
• the GBA module 240 returns the NAF specific key (Ks_(ext)_NAF) to browser's GBA API 330 with a bootstrapping transaction identifier (B-TID), and key lifetime, for example.
• the browser's GBA API 330 may determine a security token.
• the security token (TLS_MK_Extr) may be extracted from the transport layer security (TLS) master key using an exported function.
• the label for the exported function may be "EXPORTER_3GPP_GBA_WEB", for example.
• the security token (TLS_MK_Extr) may be used to derive a JavaScript specific key KsJs_NAF that is bound to the server authenticated TLS tunnel.
• the GBA API 330 returns JavaScript specific KsJs_NAF key, B-TID and key lifetime to the executing JavaScript module 320.
• the JavaScript module 320 continues, in item 12, to execute and uses the KsJs_NAF key the way web server 120 has instructed (via JavaScript code "gba.js").
• the JavaScript module 320 makes a request (e.g. HTTP request) to the web server 120.
• This request may contain at least KsJs_NAF and B-TID.
• the web server 120 may fetch the Ks_(ext)_NAF from the bootstrapping function (BSF) and determine the security token (TLS_MK_Extr), as done in item 10. The web server 120 may then derive the KsJs_NAF with the security token (TLS_MK_Extr). The web server 120 may compare the received KsJs_NAF with the locally derived one for validation. If the received KsJs_NAF is valid, the web server 120 will continue to process the request made in item 13 and return the result to the JavaScript module 320 of the web browser 120 in item 15. Furthermore, the web server 120 may continue to execute the JavaScript code.
• the communication interface module 450 implements at least part of the data transmission discussed in connection with various embodiments of the invention.
• the communication interface module 450 may be, e.g., a radio interface module, such as a WLAN, Bluetooth, GSM/GPRS, CDMA, WCDMA, or LTE (Long Term Evolution) radio module.
• the communication interface module 450 may be integrated into the application server 400 or into an adapter, card or the like that may be inserted into a suitable slot or port of the application server 400.
• the communication interface module 450 may support one radio interface technology or a plurality of technologies.
• Fig. 4 shows one communication interface module 450, but the application server 400 may comprise a plurality of communication interface modules 550.
• the communication interface module 450 provides data communication, for example, with a bootstrapping function (BSF), a home subscriber server (HSS), and an external content server.
• BSF bootstrapping function
• HSS home subscriber server
• the processor 410 may be, e.g., a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a graphics processing unit, or the like.
• Fig. 4 shows one processor 410, but the application server 400 may comprise a plurality of processors.
• the memory 420 may be for example a non-volatile or a volatile memory, such as a read-only memory (ROM), a programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), a random-access memory (RAM), a flash memory, a data disk, an optical storage, a magnetic storage, a smart card, or the like.
• the application server 400 may comprise a plurality of memories.
• the memory 420 may be constructed as a part of the application server 400 or it may be inserted into a slot, port, or the like of the application server 400.
• the memory 420 may serve the sole purpose of storing data, or it may be constructed as a part of an apparatus serving other purposes, such as processing data.
• a general bootstrapping architecture module (GBA) 440 may comprise a network application function (NAF).
• GBA may be used between the network application function (NAF) and the UE for authentication purposes, and for securing the communication path between the UE and the network application function (NAF).
• NAF network application function
• the UE and the network application function (NAF) can run some application specific protocol where the authentication of messages will be based on those session keys generated during the mutual authentication between the UE and the bootstrapping server function (BSF).
• BSF bootstrapping server function
• the application server 400 may comprise other elements, such as additional circuitry such as input/output (I/O) circuitry, memory chips, application-specific integrated circuits (ASIC), processing circuitry for specific purposes such as source coding/decoding circuitry, channel coding/decoding circuitry, ciphering/deciphering circuitry, and the like.
• additional circuitry such as input/output (I/O) circuitry, memory chips, application-specific integrated circuits (ASIC), processing circuitry for specific purposes such as source coding/decoding circuitry, channel coding/decoding circuitry, ciphering/deciphering circuitry, and the like.
• Fig. 5 presents an example block diagram of a user apparatus 500 in which various embodiments of the invention may be applied.
• This may be a user equipment (UE), user device or apparatus, such as a mobile terminal, a laptop, a tablet, or other communication device.
• UE user equipment
• user device or apparatus such as a mobile terminal, a laptop, a tablet, or other communication device.
• the general structure of the user apparatus 500 comprises a communication interface module 550, a processor 510 coupled to the communication interface module 550, and a memory 520 coupled to the processor 510.
• the user apparatus further comprises software 530 stored in the memory 520 and operable to be loaded into and executed in the processor 510.
• the software 530 may comprise one or more software modules and can be in the form of a computer program product.
• the user apparatus 500 further comprises a user interface controller 560 coupled to the processor 510.
• the communication interface module 550 implements at least part of the user data radio discussed in connection with various embodiments of the invention.
• the communication interface module 550 may be, e.g., a radio interface module, such as a WLAN, Bluetooth, GSM/GPRS, CDMA, WCDMA, or LTE (Long Term Evolution) radio module.
• the communication interface module 550 may be integrated into the user apparatus 500 or into an adapter, card or the like that may be inserted into a suitable slot or port of the user apparatus 500.
• the communication interface module 550 may support one radio interface technology or a plurality of technologies.
• Fig. 5 shows one communication interface module 550, but the user apparatus 500 may comprise a plurality of communication interface modules 550.
• the processor 510 may be, e.g., a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a graphics processing unit, or the like.
• Fig. 5 shows one processor 510, but the user apparatus 500 may comprise a plurality of processors.
• the memory 520 may be for example a non-volatile or a volatile memory, such as a read-only memory (ROM), a programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), a random-access memory (RAM), a flash memory, a data disk, an optical storage, a magnetic storage, a smart card, or the like.
• the user apparatus 500 may comprise a plurality of memories.
• the memory 520 may be constructed as a part of the apparatus 500 or it may be inserted into a slot, port, or the like of the user apparatus 500 by a user.
• the memory 520 may serve the sole purpose of storing data, or it may be constructed as a part of an apparatus serving other purposes, such as processing data.
• a universal integrated circuit card (UICC) 540 may be included as a smart card used in the user apparatus 500.
• the universal integrated circuit card (UICC) 540 ensures the integrity and security of certain personal data.
• the universal integrated circuit card (UICC) 540 may contain its unique serial number, internationally unique number of the mobile user (IMSI), security authentication and ciphering information, temporary information related to the local network, a list of the services the user has access to and passwords (PIN for usual use and PUK for unlocking).
• the universal integrated circuit card (UICC) 540 may further comprise several applications, making it possible for the same smart card to give access to different networks, and also provide storage of a phone book and other applications.
• the system may utilize an embedded security module for the key storage and processing.
• the user interface controller 560 may comprise circuitry for receiving input from a user of the user apparatus 500, e.g., via a keyboard, graphical user interface shown on the display of the user apparatus 500, speech recognition circuitry, or an accessory device, such as a headset, and for providing output to the user via, e.g., a graphical user interface or a loudspeaker.
• the user apparatus 500 may comprise other elements, such as microphones, displays, as well as additional circuitry such as input/output (I/O) circuitry, memory chips, application-specific integrated circuits (ASIC), processing circuitry for specific purposes such as source coding/decoding circuitry, channel coding/decoding circuitry, ciphering/deciphering circuitry, and the like. Additionally, the user apparatus 500 may comprise a disposable or rechargeable battery (not shown) for powering the user apparatus 500 when external power if external power supply is not available.
• I/O input/output
• ASIC application-specific integrated circuits
• processing circuitry for specific purposes such as source coding/decoding circuitry, channel coding/decoding circuitry, ciphering/deciphering circuitry, and the like.
• the user apparatus 500 may comprise a disposable or rechargeable battery (not shown) for powering the user apparatus 500 when external power if external power supply is not available.
• Fig. 6 shows a flow diagram showing operations in a user apparatus in accordance with an example embodiment of the invention.
• the method is started.
• an external code comprising a request for a server specific bootstrapping key (Ks_NAF) is received.
• a server identifier NAF-ld
• a server specific bootstrapping key Ks_NAF
• Ks_NAF server specific bootstrapping key
• a security token is determined.
• an external code specific bootstrapping key KsJs_NAF
• KsJs_NAF is generated using the server specific bootstrapping key (Ks_NAF) and the security token.
• the external code specific bootstrapping key (KsJs_NAF) is used for the security mechanism of the external code in step 660.
• the method ends in step 670.
• Fig. 7 shows a flow diagram showing operations in an application server in accordance with an example embodiment of the invention.
• the method is started.
• a script code comprising a request for a script code specific bootstrapping key (KsJs_NAF) is transmitted.
• a server identifier (NAF-ld) is determined in step 720.
• a server specific bootstrapping key (Ks_NAF) is generated using the server identifier (NAF-ld).
• a security token is determined.
• the script code specific bootstrapping key (KsJs_NAF) is generated using the server specific bootstrapping key (Ks_NAF) and the security token.
• the script code specific bootstrapping key (KsJs_NAF) is used for the security mechanism of the script code in step 760.
• the method ends in step 770.

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• 2011
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