EP1687962A1 - Security module for encrypting a telephone conversation - Google Patents

Security module for encrypting a telephone conversation

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Publication number
EP1687962A1
EP1687962A1 EP04819236A EP04819236A EP1687962A1 EP 1687962 A1 EP1687962 A1 EP 1687962A1 EP 04819236 A EP04819236 A EP 04819236A EP 04819236 A EP04819236 A EP 04819236A EP 1687962 A1 EP1687962 A1 EP 1687962A1
Authority
EP
European Patent Office
Prior art keywords
security module
protocol
network
tdm
telephone
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.)
Withdrawn
Application number
EP04819236A
Other languages
German (de)
French (fr)
Inventor
Steffen Fries
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1687962A1 publication Critical patent/EP1687962A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • 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
    • 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
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
    • H04L9/0841—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these involving Diffie-Hellman or related key agreement protocols
    • H04L9/0844—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these involving Diffie-Hellman or related key agreement protocols with user authentication or key authentication, e.g. ElGamal, MTI, MQV-Menezes-Qu-Vanstone protocol or Diffie-Hellman protocols using implicitly-certified keys
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H04M7/0078—Security; Fraud detection; Fraud prevention
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/253—Telephone sets using digital voice transmission
    • H04M1/2535—Telephone sets using digital voice transmission adapted for voice communication over an Internet Protocol [IP] network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/60—Aspects of automatic or semi-automatic exchanges related to security aspects in telephonic communication systems
    • H04M2203/609—Secret communication

Definitions

  • Security module for encrypting a telephone call
  • the invention relates to a security module for encrypting a telephone call between one or more first telecommunication terminals in a packet-oriented data network and one or more second telecommunication terminals in an analog and / or digital telephone network.
  • Telephony in IP networks is known from the prior art.
  • standards in which the signaling for telephony in IP networks is specified.
  • VoIP Voice over IP
  • LAN Local Area Network
  • WLAN Wireless Local Area Network
  • security aspects relating to the authenticity and integrity of control and signaling data have mainly been considered in VoIP telephony.
  • the security of the transmitted voice data will also be taken into account.
  • SRTP Secure Real Time Transport Protocol
  • the object of the invention is therefore to provide a security module for encrypting a telephone call, which Encryption of the voice data in a heterogeneous network comprehensively enables a packet-oriented data network and a telephone network.
  • the security module is used to encrypt a telephone call between one or more first telecommunication terminals in a packet-oriented data network and one or more second telecommunication terminals in an analog and / or digital telephone network, data packets being transported in the packet-oriented network using an encrypted transport protocol and the keys for the encrypted one Transport protocol can be exchanged using a key exchange protocol.
  • PSTN Public Switched Telephone Network
  • the packet-oriented network and the telephone network are connected to one another via an access computer and the security module can be interposed in a connecting line on a first or second telecommunications terminal during a telephone call.
  • the term “connecting line” is to be understood generally here, it can be both a wired and a wireless connection on the corresponding telecommunication terminal.
  • the security module comprises a protocol processing device which processes messages of the key exchange protocol as well as data packets transported by means of the encrypted transport protocol if the security module is interposed in a connection line on a first or second telecommunication terminal during a telephone call.
  • Task of the protocol The processing device is to convert voice signals which are generated at the corresponding telecommunications terminal into data packets for transport via the encrypted transport protocol and to convert data packets arriving at the security module and which are transported via the encrypted transport protocol into voice signals.
  • the security module also includes a modem connection unit, which is always used when the security module is interposed in a connection line on a second telecommunication terminal.
  • the modem connection unit sets up a modem connection between the second telecommunication terminal and the access computer and / or a further second telecommunication terminal during a telephone call, data packets being transported via the modem connection using the encrypted transport protocol and messages from the key exchange protocol
  • PPP Point to Point Protocol
  • the modem connection unit in the security module thus implements a transfer of encryption technologies from packet-oriented networks to public telephone networks. This is possible because modem connections nowadays have sufficient bandwidth or transmission rates for the transmission of real-time media data packets.
  • SRTP (see document [1]) is used as the encrypted transport protocol.
  • SIP Session Initiation Protocol
  • the telephone network in which the security module according to the invention is used is, for example, a digital ISDN network.
  • the modem connection unit preferably establishes a modem connection via the B channel in the ISDN network.
  • the packet-oriented network is preferably an IP-based data network, in particular a LAN network.
  • the modem connection unit preferably establishes a modem connection according to the V90 and / or V92 standard, this standard providing sufficient bandwidths or transmission rates for the transmission of data packets from packet-oriented networks.
  • the security module is used for telephones with a connecting cable between the telephone set and the telephone handset, the security module being designed in such a way that it is interposed in the connecting cable.
  • FIG. 1 shows the schematic representation of a heterogeneous network in which the security module according to the invention is used to encrypt voice signals.
  • the TDM network is a digital network, but a separate analog voice channel is used to transmit spoken voice.
  • the LAN and the TDM network are connected to one another via a gateway G.
  • the gateway is used to modify IP data packets transmitted in the LAN network for forwarding in the TDM network as well as data from the TDM network for forwarding in the LAN network.
  • VoIP clients VoIP-C which enable calls to be made over packet-oriented networks.
  • VoIP over IP the standards SIP or H.323, which are well known to the person skilled in the art, can be used for signaling voice messages.
  • the lower VoIP client in Fig. 1 is a telephone with which the establishment of an encrypted telephone connection is intended. Therefore, between the handset of the telephone and the actual telephone connection in the corresponding ⁇ security module SM according to the invention line interposed.
  • the security modules known from the prior art enable the telephone call to be encrypted only within the TDM network, with each telephone call subscriber generating a key to set up an encrypted telephone connection by pressing a button on his security module, which key is transmitted via a proprietary signaling Protocol is exchanged between the parties' telephones. Finally, combinations of numbers are shown on displays that are integrated in the security modules, which the callers announce to each other via the telephone connection. If the number combinations match, it can be assumed that the connection is not being tapped by a third party, so that the encrypted data transmission is finally carried out with the help of the exchanged keys, again using a proprietary protocol.
  • the security module solves this problem in that it can process protocols known from the IP world for encrypting data in a normal public TDM network.
  • the protocol processing device can process the key exchange protocol MIKEY.
  • MIKEY key exchange protocol
  • keys are generated and exchanged between the clients or telephones in the heterogeneous network of FIG. 1.
  • the keys are used here by the transport protocol SRTP for the encrypted transmission of the data packets by means of SRTP.
  • the protocol processing facility enables including encrypted telephony between VoIP clients in the LAN network. This is shown in FIG. 1 with the double arrows MIKEY-KM (KM stands for key management) and SRTP-MS (MS stands for media security).
  • the security module SM has a modem connection unit. This modem connection unit provides one during a telephone call
  • Participant in the TDM network with a participant in the LAN network establishes a modem connection to the gateway G via a voice channel in the TDM network.
  • This is preferably a V92 modem connection with which data can be transmitted at 56 kbit / s downstream and 48 kbit / s upstream.
  • the MIKEY messages are transported in the LAN network, for example using the SIP protocol.
  • the contents of the MIKEY messages can then be cut out of the SIP message and inserted into the PPP tunnel.
  • the gateway it would also be conceivable for the gateway to simply forward the SIP messages to the PPP tunnel without cutting out the MIKEY messages.
  • the protocol processing device of the security module SM must be able to process the SIP protocol.
  • the security module SM functions as a SIP end point.
  • the gateway G le ⁇ takes diglich a forwarding function, and changes the data Not. This also applies to the actual key exchange data in the form of MIKEY messages. If required, however, the gateway can also be included in the connection as a trustworthy component, for example to enable "lawful interception".
  • the mechanism according to the invention is illustrated again by the arrows in the lower region of FIG. 1.
  • a modem connection is used between the gateway G and a TDM client TDM-C for encrypted data transport, via which the PPP protocol runs, which in turn is used to transport IP data packets.
  • IP-PPP-TDM end-to-end encryption is implemented between a client in the LAN network and a client in the TDM network using the MIKEY key exchange protocol and the SRTP
  • Transport protocol reached SRTP. This is emphasized by the double arrows labeled MIKEY-KM and SRTP-MS.
  • the security module according to the invention thus enables the transmission of encryption protocols known from the IP world into a public telephone network in a simple manner. This is guaranteed by a modem connection, which, due to its possible bandwidths and transmission rates, enables the transport of real-time data packets and signaling messages from the IP world.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention relates to a security module (SM) for encrypting a telephone conversation between one or several first telecommunication terminals (VoIP-C) in a packet oriented data network (IP-LAN) and telecommunication terminals (TDM-C) in an analog and/or digital telephone network (TDM). Said module enables the use of protocols (MIKEY; SRTP) from the LAN network to the TDM network in order to carry out an end-to-end encryption.

Description

Beschreibung description
Sicherheitsmodul zum Verschlüsseln eines TelefongesprächsSecurity module for encrypting a telephone call
Die Erfindung betrifft ein Sicherheitsmodul zum Verschlüsseln eines Telefongesprächs zwischen einem oder mehreren ersten Telekommunikationsendgeräten in einem paketorientierten Datennetz und einem oder mehreren zweiten Telekommunikations- endgeräten in einem analogen und/oder digitalen Telefonnetz.The invention relates to a security module for encrypting a telephone call between one or more first telecommunication terminals in a packet-oriented data network and one or more second telecommunication terminals in an analog and / or digital telephone network.
Aus dem Stand der Technik ist die Telefonie in IP-Netzen bekannt. Es existieren mittlerweile Standards, in denen die Signalisierung für die Telefonie in IP-Netzen festgelegt ist . Es handelt sich hierbei um den IETF Standard SIP und den ITU- Standard H.323, die auch als "Voice over IP" (VoIP) bezeichnet werden und hauptsächlich in LAN- oder WLAN-basierten Netzwerken Anwendung finden (LAN = Local Area Network, WLAN = Wireless Local Area Network) . Bei der VoIP-Telefonie wurden bis heute hauptsächlich Sicherheitsaspekte in Bezug auf die Authentizität und Integrität von Kontroll- und Signalisie- rungsdaten betrachtet . In künftigen Lösungen wird neben der reinen Signalisierungssicherheit auch die Sicherheit der übertragenen Sprachdaten berücksichtigt. Zur Sicherung von Sprachdaten in IP-Netzen kommt beispielsweise das verschlüs- selte Transportprotokoll SRTP (SRTP = Secure Real Time Transport Protocol; siehe Dokument [1]) in Betracht.Telephony in IP networks is known from the prior art. There are now standards in which the signaling for telephony in IP networks is specified. These are the IETF standard SIP and the ITU standard H.323, which are also referred to as "Voice over IP" (VoIP) and are mainly used in LAN or WLAN-based networks (LAN = Local Area Network, WLAN = Wireless Local Area Network). To date, security aspects relating to the authenticity and integrity of control and signaling data have mainly been considered in VoIP telephony. In future solutions, in addition to pure signaling security, the security of the transmitted voice data will also be taken into account. For example, the encrypted transport protocol SRTP (SRTP = Secure Real Time Transport Protocol; see document [1]) can be used to secure voice data in IP networks.
Mit den derzeitigen Sicherheitslösungen wird jedoch nur eine Sicherung von Sprachdaten in paketorientierten Netzwerken ge- währleistet. Es existieren zwar auch Sicherheitslösungen für die Telefonie in öffentlichen Telefonnetzen, jedoch gibt es bis heute keine Möglichkeit, Telefongespräche von einem paketorientierten Netz zu einem öffentlichen Telefonnetz verschlüsselt durchzuführen.With the current security solutions, however, only a backup of voice data in packet-oriented networks is guaranteed. Although there are security solutions for telephony in public telephone networks, there is still no way to make encrypted telephone calls from a packet-oriented network to a public telephone network.
Aufgabe der Erfindung ist es deshalb, ein Sicherheitsmodul zum Verschlüsseln eines Telefongesprächs zu schaffen, welches eine Verschlüsselung der Sprachdaten in einem heterogenen Netzwerk umfassend ein paketorientiertes Datennetz und ein Telefonnetz ermöglicht.The object of the invention is therefore to provide a security module for encrypting a telephone call, which Encryption of the voice data in a heterogeneous network comprehensively enables a packet-oriented data network and a telephone network.
Diese Aufgabe wird durch die unabhängigen Patentansprüche gelöst. Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen definiert.This problem is solved by the independent claims. Further developments of the invention are defined in the dependent claims.
Das erfindungsgemäße Sicherheitsmodul dient zum Verschlüsseln eines Telefongesprächs zwischen einem oder mehreren ersten Telekommunikationsendgeräten in einem paketorientierten Datennetz und einem oder mehreren zweiten Telekommunikationsendgeräten in einem analogen und/oder digitalen Telefonnetz, wobei im paketorientierten Netz Datenpakete mittels eines verschlüsselten Transportprotokolls transportiert werden und die Schlüssel für das verschlüsselte Transportprotokoll mittels eines Schlüssel-Austausch-Protokolls ausgetauscht werden. Im Folgenden ist unter einem Telefonnetz jede Art von öffentlichem PSTN-Netz (PSTN = Public Switched Telephone Net- work) zu verstehen, wobei es sich sowohl um ein analoges als auch um ein digitales Telefonnetz handeln kann. Das paketorientierte Netz und das Telefonnetz sind hierbei über einen Zugangsrechner miteinander verbunden und das Sicherheitsmodul kann bei einem Telefongespräch in einer Verbindungsleitung an einem ersten oder zweiten Telekommunikationsendgerät zwischengeschaltet werden. Der Begriff "Verbindungsleitung" ist hierbei allgemein zu verstehen, es kann sich sowohl um eine drahtgebundene als auch um eine drahtlose Verbindung an dem entsprechenden Telekommunikationsendgerät handeln.The security module according to the invention is used to encrypt a telephone call between one or more first telecommunication terminals in a packet-oriented data network and one or more second telecommunication terminals in an analog and / or digital telephone network, data packets being transported in the packet-oriented network using an encrypted transport protocol and the keys for the encrypted one Transport protocol can be exchanged using a key exchange protocol. In the following, a telephone network is to be understood as any type of public PSTN network (PSTN = Public Switched Telephone Network), which can be an analog as well as a digital telephone network. The packet-oriented network and the telephone network are connected to one another via an access computer and the security module can be interposed in a connecting line on a first or second telecommunications terminal during a telephone call. The term “connecting line” is to be understood generally here, it can be both a wired and a wireless connection on the corresponding telecommunication terminal.
Das erfindungsgemäße Sicherheitsmodul umfasst eine Protokollverarbeitungseinrichtung, welche Nachrichten des Schlüssel- Austausch-Protokolls sowie mittels des verschlüsselten Transportprotokolls transportierte Datenpakete verarbeitet, wenn das Sicherheitsmodul bei einem Telefongespräch in eine Verbindungsleitung an einem ersten oder zweiten Telekommunikati- onsendgerät zwischengeschaltet ist. Aufgabe der Protokollver- arbeitungseinrichtung ist es, Sprachsignale, die an dem entsprechenden Telekommunikationsendgerät erzeugt werden, in Datenpakete zum Transport über das verschlüsselte Transport— Protokoll umzuwandeln und an dem Sicherheitsmodul ankommende Datenpakete, die über das verschlüsselte Transportprotokoll transportiert werden, in Sprachsignale umzuwandeln.The security module according to the invention comprises a protocol processing device which processes messages of the key exchange protocol as well as data packets transported by means of the encrypted transport protocol if the security module is interposed in a connection line on a first or second telecommunication terminal during a telephone call. Task of the protocol The processing device is to convert voice signals which are generated at the corresponding telecommunications terminal into data packets for transport via the encrypted transport protocol and to convert data packets arriving at the security module and which are transported via the encrypted transport protocol into voice signals.
Das Sicherheitsmodul umfasst ferner eine Modemverbindungs ein- heit, welche immer dann zum Einsatz kommt, wenn das Siehe r- heitsmodul in einer Verbindungsleitung an einem zweiten Telekommunikationsendgerät zwischengeschaltet ist. In diesem Fall baut die Modemverbindungseinheit bei einem Telefongespräch eine Modemverbindung zwischen dem zweiten Telekommunikationsendgerät und dem Zugangsrechner und/oder einem weiteren z" ei- ten Telekommunikationsendgerät auf, wobei über die Modemverbindung Datenpakete mittels des verschlüsselten Transportprotokolls sowie Nachrichten des Schlüssel-Austausch-Protokolls transportiert werden. Vorzugsweise läuft über die Modemverbindung eine PPP-Verbindung (PPP = Point to Point Protocol) , mit der die Datenpakete des Transportprotokolls sowie dieThe security module also includes a modem connection unit, which is always used when the security module is interposed in a connection line on a second telecommunication terminal. In this case, the modem connection unit sets up a modem connection between the second telecommunication terminal and the access computer and / or a further second telecommunication terminal during a telephone call, data packets being transported via the modem connection using the encrypted transport protocol and messages from the key exchange protocol A PPP connection (PPP = Point to Point Protocol), with which the data packets of the transport protocol and the
Nachrichten des Schlüssel-Austauschs-Protokolls transportiert werden. Durch die Modemverbindungseinheit im Sicherheitsmodul wird somit eine Übertragung von Verschlüsselungstechnologien aus paketorientierten Netzwerken in öffentliche Telefonnetze realisiert. Dies ist möglich, da Modemverbindungen heutzutage ausreichende Bandbreite bzw. Übertragungsraten zur Übertragung von Echtzeit-Mediendatenpaketen aufweisen.Messages of the key exchange protocol are transported. The modem connection unit in the security module thus implements a transfer of encryption technologies from packet-oriented networks to public telephone networks. This is possible because modem connections nowadays have sufficient bandwidth or transmission rates for the transmission of real-time media data packets.
In einer besonders bevorzugten Ausführungsform wird als irer- schlüsseltes Transportprotokoll SRTP (siehe Dokument [1] ) verwendet. Für den Austausch der Schlüssel, die in dem verschlüsselten Transportprotokoll eingesetzt werden, wird vorzugsweise das Schlüssel-Autausch-Protokoll MIKEY (= Multimedia Internet KEYing) eingesetzt. MIKEY ist derzeit ein Draft bei der IETF, der in absehbarer Zeit zum Standard erklärt werden wird. In einer weiteren Ausführungsform des Sicherheitsmoduls werden bei einem Telefongespräch Nachrichten des Schlüssel- Austausch-Protokolls über das aus dem Stand der Technik bekannte SIP-Protokoll (SIP = Session Initiation Protocol) transportiert, wobei die Protokollverarbeitungseinrichtung des Sicherheitsmoduls derart ausgestaltet ist, dass sie dieses Protokoll verarbeiten kann.In a particularly preferred embodiment, SRTP (see document [1]) is used as the encrypted transport protocol. The key exchange protocol MIKEY (= Multimedia Internet KEYing) is preferably used for the exchange of the keys that are used in the encrypted transport protocol. MIKEY is currently a draft at the IETF and will be the standard in the foreseeable future. In a further embodiment of the security module, messages of the key exchange protocol are transported during a telephone call using the SIP protocol (SIP = Session Initiation Protocol) known from the prior art, the protocol processing device of the security module being designed in such a way that it uses this protocol can process.
Das Telefonnetz, in dem das erfindungsgemäße Sicherheitsmodul zum Einsatz kommt, ist beispielsweise ein digitales ISDN- Netz. Vorzugsweise baut die Modem-Verbindungseinheit dabei eine Modemverbindung über den B-Kanal im ISDN-Netz auf. Bei dem paketorientierten Netz handelt es sich vorzugsweise um ein IP-basiertes Datennetz, insbesondere ein LAN-Netz . Die Modemverbindungseinheit stellt vorzugsweise eine Modemverbindung nach dem V90 und/oder V92-Standard her, wobei dieser Standard ausreichende Bandbreiten bzw. Übertragungsraten für die Übermittlung von Datenpaketen aus paketorientierten Netzen bereitstellt.The telephone network in which the security module according to the invention is used is, for example, a digital ISDN network. The modem connection unit preferably establishes a modem connection via the B channel in the ISDN network. The packet-oriented network is preferably an IP-based data network, in particular a LAN network. The modem connection unit preferably establishes a modem connection according to the V90 and / or V92 standard, this standard providing sufficient bandwidths or transmission rates for the transmission of data packets from packet-oriented networks.
In einer Variante der Erfindung wird das Sicherheitsmodul für Telefone mit einem Verbindungskabel zwischen Telefonapparat und Telefonhörer verwendet, wobei das Sicherheitsmodul derart ausgestaltet ist, dass es in dem Verbindungskabel zwischenge- schaltet wird.In a variant of the invention, the security module is used for telephones with a connecting cable between the telephone set and the telephone handset, the security module being designed in such a way that it is interposed in the connecting cable.
Ausführungsbeispiele der Erfindung werden nachfolgend anhand der beigefügten Zeichnung beschrieben.Embodiments of the invention are described below with reference to the accompanying drawings.
Es zeigtIt shows
Figur 1 die schematische Darstellung eines heterogenen Netzwerks, in dem das erfindungsgemäße Sicherheitsmodul zur Verschlüsselung von Sprachsignalen ver- wendet wird. Das in Figur 1 gezeigte heterogene Netzwerk umfasst zum einen ein IP-basiertes lokales Netzwerk LAN (LAN = Local Area Network) sowie ein öffentliches TDM-Telefonnetz (TDM = Time Division Multiplexing) . Bei dem TDM-Netz handelt es sich um ein digitales Netz, wobei jedoch zur Übertragung von gesprochener Sprache ein gesonderter analoger Sprachkanal verwendet wird. Das LAN- und das TDM-Netz sind über ein Gateway G miteinander verbunden. Das Gateway dient dazu, im LAN-Netz übertragene IP-Datenpakete zur Weiterleitung im TDM-Netz sowie Daten aus dem TDM-Netz zur Weiterleitung im LAN-Netz entsprechend zu modifizieren .FIG. 1 shows the schematic representation of a heterogeneous network in which the security module according to the invention is used to encrypt voice signals. The heterogeneous network shown in FIG. 1 comprises an IP-based local area network (LAN) and a public TDM telephone network (TDM = Time Division Multiplexing). The TDM network is a digital network, but a separate analog voice channel is used to transmit spoken voice. The LAN and the TDM network are connected to one another via a gateway G. The gateway is used to modify IP data packets transmitted in the LAN network for forwarding in the TDM network as well as data from the TDM network for forwarding in the LAN network.
Im LAN-Netz befinden sich zwei sogenannte VoIP-Clients VoIP- C, welche das Telefonieren über paketorientierte Netze ermög- liehen. Beim Telefonieren über "Voice over IP" können die dem Fachmann hinlänglich bekannten Standards SIP oder H.323 zur Signalisierung von Sprachnachrichten verwendet werden. Der untere VoIP-Client in Fig. 1 ist ein Telefon, mit dem der Aufbau einer verschlüsselten Telefonverbindung beabsichtigt ist. Deshalb ist zwischen dem Hörer des Telefons und dem eigentlichen Telefonapparat in der entsprechenden Verbindungs¬ leitung das erfindungsgemäße Sicherheitsmodul SM zwischengeschaltet .In the LAN network there are two so-called VoIP clients VoIP-C, which enable calls to be made over packet-oriented networks. When telephoning via "Voice over IP", the standards SIP or H.323, which are well known to the person skilled in the art, can be used for signaling voice messages. The lower VoIP client in Fig. 1 is a telephone with which the establishment of an encrypted telephone connection is intended. Therefore, between the handset of the telephone and the actual telephone connection in the corresponding ¬ security module SM according to the invention line interposed.
In dem TDM-Netz der Figur 1 sind beispielhaft zwei TDM-In the TDM network of FIG. 1, two TDM
Clients TDM-C in Form von Telefonen gezeigt, mit denen ebenfalls verschlüsselte Telefongespräche geführt werden können. Deshalb ist auch bei diesen Telefonen zwischen dem Hörer und dem eigentlichen Telefonapparat in der Verbindungsleitung das erfindungsgemäße Sicherheitsmodul SM zwischengeschaltet.Clients TDM-C shown in the form of telephones, with which encrypted telephone calls can also be made. Therefore, the security module SM according to the invention is interposed in these telephones between the handset and the actual telephone set in the connecting line.
Die aus dem Stand der Technik bekannten Sicherheitsmodule ermöglichen ein Verschlüsseln des Telefongesprächs nur innerhalb des TDM-Netzes, wobei jeder Telefongesprächsteilnehmer zum Aufbau einer verschlüsselten Telefonverbindung durch den Druck auf eine Taste an seinem Sicherheitsmodul jeweils einen Schlüssel erzeugt, der über ein proprietäres Signalisierungs- Protokoll zwischen den Telefonapparaten der Gesprächsteilneri- mer ausgetauscht wird. Schließlich werden an Displays, die in den Sicherheitsmodulen integriert sind, jeweils Zahlenkombi— nationen angezeigt, welche sich die Gesprächsteilnehmer ge- genseitig über die Telefonverbindung durchsagen. Sollten die Zahlenkombinationen übereinstimmen, kann davon ausgegangen werden, dass die Verbindung von keinem Dritten abgehört wird., so dass mit Hilfe der ausgetauschten Schlüssel schließlich die verschlüsselte Datenübertragung erfolgt, wobei hierzu wiederum ein proprietäres Protokoll verwendet wird. Experi¬ mente haben gezeigt, dass mit den herkömmlichen Sicherheits— modulen keine verschlüsselten Telefongespräche zwischen einem Telefon in einem paketorientierten Netz und einem Telefon in einem TDM-Netz geführt werden können. Dies resultiert daher, dass in paketorientierten Netzen die Daten asynchron übertragen werden, was zu Bandbreitenschwankungen (auch als "Jitter" bezeichnet) führen kann, die von herkömmlichen Sicherheitsmodulen nicht verarbeitet werden können. Ebenso führen in paketorientierten Netzen auftretende Datenpaketverluste bei herkömmlichen Sicherheitsmodulen zu Problemen.The security modules known from the prior art enable the telephone call to be encrypted only within the TDM network, with each telephone call subscriber generating a key to set up an encrypted telephone connection by pressing a button on his security module, which key is transmitted via a proprietary signaling Protocol is exchanged between the parties' telephones. Finally, combinations of numbers are shown on displays that are integrated in the security modules, which the callers announce to each other via the telephone connection. If the number combinations match, it can be assumed that the connection is not being tapped by a third party, so that the encrypted data transmission is finally carried out with the help of the exchanged keys, again using a proprietary protocol. Experi ¬ ments have shown that with conventional safety modules not encrypted phone calls between a telephone in a packet-oriented network and a telephone in a TDM network can be performed. The result of this is that the data are transmitted asynchronously in packet-oriented networks, which can lead to bandwidth fluctuations (also referred to as “jitter”), which cannot be processed by conventional security modules. Likewise, data packet losses that occur in packet-oriented networks lead to problems with conventional security modules.
Das Sicherheitsmodul gemäß der hier beschriebenen Ausführungsform löst dieses Problem dadurch, dass es aus der IP- Welt bekannte Protokolle zum Verschlüsseln von Daten in einem normalen öffentlichen TDM-Netz verarbeiten kann. Hierzu ist in dem Sicherheitsmodul eine Protokollverarbeitungseinrichtung vorgesehen, welche das verschlüsselte Transportprotokoil SRTP (SRTP = Secure Real Time Protocol) verarbeiten kann. Dieses Protokoll wird voraussichtlich zukünftig als Standard. zur verschlüsselten Übertragung von Medien-Daten verwendet.The security module according to the embodiment described here solves this problem in that it can process protocols known from the IP world for encrypting data in a normal public TDM network. For this purpose, a protocol processing device is provided in the security module, which can process the encrypted transport protocol SRTP (SRTP = Secure Real Time Protocol). This protocol is expected to become the standard in the future. used for encrypted transmission of media data.
Darüber hinaus kann die Protokollverarbeitungseinrichtung das Schlüssel-Austausch-Protokoll MIKEY verarbeiten. Mit diesem Protokoll werden Schlüssel erzeugt und zwischen den Clients bzw. Telefonen im heterogenen Netz der Fig. 1 ausgetauscht. Die Schlüssel werden hierbei von dem Transportprotokoll SRTP zur verschlüsselten Übertragung der Datenpakete mittels SRTP verwendet. Die Protokollverarbeitungseinrichtung ermöglicht unter anderem die verschlüsselte Telefonie zwischen VoIP- Clients im LAN-Netz. Dies ist in Figur 1 mit den Doppelpfeilen MIKEY-KM (KM steht für Key Management) und SRTP-MS (MS steht für Media Security) dargestellt.In addition, the protocol processing device can process the key exchange protocol MIKEY. With this protocol, keys are generated and exchanged between the clients or telephones in the heterogeneous network of FIG. 1. The keys are used here by the transport protocol SRTP for the encrypted transmission of the data packets by means of SRTP. The protocol processing facility enables including encrypted telephony between VoIP clients in the LAN network. This is shown in FIG. 1 with the double arrows MIKEY-KM (KM stands for key management) and SRTP-MS (MS stands for media security).
Zum Aufbau einer verschlüsselten Telefonverbindung zwischen Teilnehmern im TDM-Netz bzw. zwischen einem Teilnehmer im LAN-Netz und einem Teilnehmer im TDM-Netz weist das Sicherheitsmodul SM eine Modemverbindungseinheit auf. Diese Modem- Verbindungseinheit stellt bei einem Telefongespräch einesTo set up an encrypted telephone connection between subscribers in the TDM network or between a subscriber in the LAN network and a subscriber in the TDM network, the security module SM has a modem connection unit. This modem connection unit provides one during a telephone call
Teilnehmers im TDM-Netz mit einem Teilnehmer im LAN-Netz eine Modemverbindung über einen Sprachkanal im TDM-Netzes zu dem Gateway G her. Vorzugsweise handelt es sich hier um eine V92 Modemverbindung, mit der Daten mit 56 kbit/s downstream und 48 kbit/s upstream übertragen werden können. Über diese Verbindung wird eine weitere Verbindung mittels des PPP- Protokolls (PPP = Point to Point Protocol) zur Verfügung gestellt, wobei über letztere Daten im Schlüssel-Austausch- Protokoll MIKEY bzw. im SRTP-Protokoll transportiert werden. Da diese Protokolle von der Protokollverarbeitungseinrichtung im Sicherheitsmodul SM verarbeitet werden können, wird somit eine Migration der Protokolle aus dem LAN-Netz in das TDM- Netz ermöglicht.Participant in the TDM network with a participant in the LAN network establishes a modem connection to the gateway G via a voice channel in the TDM network. This is preferably a V92 modem connection with which data can be transmitted at 56 kbit / s downstream and 48 kbit / s upstream. A further connection is made available via this connection by means of the PPP protocol (PPP = Point to Point Protocol), the latter being used to transport data in the key exchange protocol MIKEY or in the SRTP protocol. Since these protocols can be processed by the protocol processing device in the security module SM, a migration of the protocols from the LAN network into the TDM network is made possible.
Die MIKEY-Nachrichten werden im LAN-Netz beispielsweise über das SIP-Protokoll transportiert. Im Gateway können die Inhalte der MIKEY-Nachrichten dann aus der SIP-Nachricht herausgeschnitten und in den PPP-Tunnel eingefügt werden. Es wäre jedoch auch denkbar, dass das Gateway die SIP-Nachrichten ein- fach an den PPP-Tunnel weiterschickt, ohne die MIKEY- Nachrichten herauszuschneiden. In einem solchen Fall muss die Protokollverarbeitungseinrichtung des Sicherheitsmoduls SM das SIP-Protokoll verarbeiten können. Somit ist auch eine Lösung denkbar, bei dem das Sicherheitsmodul SM als SIP- Endpunkt fungiert. In Bezug auf die Daten, die über das SRTP- Protokoll transportiert werden, übernimmt das Gateway G le¬ diglich eine Weiterleitungsfunktion und verändert die Daten nicht. Die gilt auch für die eigentlichen Schlüssel- Austausch-Daten in Form von MIKEY-Nachrichten. Bei Bedarf kann das Gateway jedoch auch als vertrauenswürdige Komponente in die Verbindung einbezogen werden, um so z.B. "Lawful In- terception" zu ermöglichen.The MIKEY messages are transported in the LAN network, for example using the SIP protocol. In the gateway, the contents of the MIKEY messages can then be cut out of the SIP message and inserted into the PPP tunnel. However, it would also be conceivable for the gateway to simply forward the SIP messages to the PPP tunnel without cutting out the MIKEY messages. In such a case, the protocol processing device of the security module SM must be able to process the SIP protocol. A solution is therefore also conceivable in which the security module SM functions as a SIP end point. With respect to the data that is transported over the SRTP protocol, the gateway G le ¬ takes diglich a forwarding function, and changes the data Not. This also applies to the actual key exchange data in the form of MIKEY messages. If required, however, the gateway can also be included in the connection as a trustworthy component, for example to enable "lawful interception".
Durch die Pfeile im unteren Bereich der Figur 1 wird nochmals der erfindungsgemäße Mechanismus verdeutlicht. Durch den mit p-IP bezeichneten Doppelpfeil (p-IP = piain IP) wird hervor- gehoben, dass zum einen eine rein IP-basierte verschlüsselte Datenübertragung zwischen einem VoIP-Client VoIP-C und dem Gateway G verwendet wird. Demgegenüber wird zwischen dem Gateway G und einem TDM-Client TDM-C zum verschlüsselten Datentransport eine Modemverbindung verwendet, über welche das PPP-Protokoll läuft, mit dem wiederum IP-Datenpakete transportiert werden. Dies wird durch den Doppelpfeil IP-PPP-TDM verdeutlicht. Trotz dieser unterschiedlichen Verbindungsmechanismen wird zwischen einem Client im LAN-Netz und einem Client im TDM-Netz eine Ende-zu-Ende-Verschlüsselung mittels des Schlüssel-Austausch-Protokolls MIKEY und des SRTP-The mechanism according to the invention is illustrated again by the arrows in the lower region of FIG. 1. The double arrow labeled p-IP (p-IP = piain IP) emphasizes that on the one hand a purely IP-based encrypted data transmission between a VoIP client VoIP-C and the gateway G is used. In contrast, a modem connection is used between the gateway G and a TDM client TDM-C for encrypted data transport, via which the PPP protocol runs, which in turn is used to transport IP data packets. This is illustrated by the double arrow IP-PPP-TDM. Despite these different connection mechanisms, end-to-end encryption is implemented between a client in the LAN network and a client in the TDM network using the MIKEY key exchange protocol and the SRTP
Transport-Protokolls SRTP erreicht. Dies wird durch die mit MIKEY-KM und SRTP-MS bezeichneten Doppelpfeile hervorgehoben.Transport protocol reached SRTP. This is emphasized by the double arrows labeled MIKEY-KM and SRTP-MS.
Mit dem erfindungsgemäßen Sicherheitsmodul wird somit auf einfache Weise die Übertragung von aus der IP-Welt bekannten Verschlüsselungsprotokollen in ein öffentliches Telefonnetz ermöglicht . Dies wird durch eine Modemverbindung gewährleistet, welche aufgrund ihrer heutzutage möglichen Bandbreiten bzw. Übertragungsraten den Transport von Echtzeit- Datenpaketen und Signalisierungsnachrichten aus der IP-Welt ermöglicht . Literaturverzeichnis :The security module according to the invention thus enables the transmission of encryption protocols known from the IP world into a public telephone network in a simple manner. This is guaranteed by a modem connection, which, due to its possible bandwidths and transmission rates, enables the transport of real-time data packets and signaling messages from the IP world. Bibliography :
[1] Internet Draft: The Secure Real-time Transport Protocol; Baugher, McGrew, Oran, Blom, Carrara, Naslund, Norrman; Work in Progress; http://search.ietf.org/internet- drafts/draft-ietf-avt-srtp-09.txt[1] Internet Draft: The Secure Real-time Transport Protocol; Baugher, McGrew, Oran, Blom, Carrara, Naslund, Norrman; Work in progress; http://search.ietf.org/internet- drafts / draft-ietf-avt-srtp-09.txt
[2] Internet Draft: MIKEY: Multimedia Internet KEYing; J. Arkko, E. Carrara, F. Lindholm, M. Naslund, K. Norrman; Work in Progress; http://search.ietf.org/internet- drafts/draft-ietf-msec-mikey-07. txt [2] Internet Draft: MIKEY: Multimedia Internet KEYing; J. Arkko, E. Carrara, F. Lindholm, M. Naslund, K. Norrman; Work in progress; http://search.ietf.org/internet- drafts / draft-ietf-msec-mikey-07. txt

Claims

Patentansprüche claims
1. Sicherheitsmodul zum Verschlüsseln eines Telefongesprächs zwischen einem oder mehreren ersten Telekommunikations- endgeräten (VoIP-C) in einem paketorientierten Datennetz (LAN) und einem oder mehreren zweiten Telekommunikationsendgeräten (TDM-C) in einem analogen und/oder digitalen Telefonnetz (TDM) , wobei im paketorientierten Netz (LAN) Datenpakete mittels eines verschlüsselten Transportproto- kolls transportiert werden und die Schlüssel für das verschlüsselte Transportprotokoll mittels eines Schlüssel- Austausch-Protokolls ausgetauscht werden, wobei das paketorientierte Netz (LAN) und das Telefonnetz (TDM) über einen Zugangsrechner (G) miteinander verbunden sind und wobei das Sicherheitsmodul (SM) bei einem Telefongespräch in eine Verbindungsleitung an einem ersten oder zweiten Telekommunikationsendgerät (VoIP-C; TDM-C) zwischengeschaltet werden kann, umfassend: eine Protokollverarbeitungseinrichtung, welche Nach- richten des Schlüssel-Austausch-Protokolls sowie mittels des verschlüsselten Transportprotokolls transportierte Datenpakete verarbeitet, wenn das Sicherheitsmodul (SM) bei einem Telefongespräch in einer Verbindungsleitung an einem ersten oder zweiten Telekommuni- kationsendgerät (VoIP-C; TDM-C) zwischengeschaltet ist, wobei die Protokollverarbeitungseinrichtung an dem ersten oder zweiten Telekommunikationsendgerät (VoIP-C; TDM-C) erzeugte Sprachsignale in Datenpakete zum Transport über das verschlüsselte Transportprotokoll umwan- delt und an dem Sicherheitsmodul ankommende Datenpakete, die über das verschlüsselte Transportprotokoll transportiert werden, in Sprachsignale umwandelt; - eine Modemverbindungseinheit, welche im Falle, wenn das Sicherheitsmodul (SM) in einer Verbindungsleitung an einem zweiten Telekommunikationsendgerät (TDM-C) zwischengeschaltet ist, bei einem Telefongespräch eine Modemverbindung zwischen dem zweiten Telekommunikations- endgerät und dem Zugangsrechner (G) und/oder einem weiteren zweiten Telekommunikationsendgerät (TDM-C) aufbaut, wobei über die Modemverbindung die Datenpakete mittels des verschlüsselten Transportprotokolls sowie Nachrichten des Schlüssel-Austausch-Protokolls transportiert werden.1. Security module for encrypting a telephone call between one or more first telecommunication terminals (VoIP-C) in a packet-oriented data network (LAN) and one or more second telecommunication terminals (TDM-C) in an analog and / or digital telephone network (TDM), whereby data packets are transported in the packet-oriented network (LAN) using an encrypted transport protocol and the keys for the encrypted transport protocol are exchanged using a key exchange protocol, the packet-oriented network (LAN) and the telephone network (TDM) using an access computer ( G) are connected to one another and the security module (SM) can be interposed during a telephone call into a connecting line on a first or second telecommunication terminal (VoIP-C; TDM-C), comprising: a protocol processing device, which messages the key exchange Protocol and mitt els of the encrypted transport protocol processes data packets when the security module (SM) during a telephone call in a connecting line on a first or second telecommunication terminal (VoIP-C; TDM-C) is interposed, the protocol processing device on the first or second telecommunications terminal (VoIP-C; TDM-C) converts voice signals into data packets for transport via the encrypted transport protocol and data packets arriving at the security module via the encrypted transport protocol be transported, converted into speech signals; a modem connection unit which, in the case when the security module (SM) is connected in a connecting line to a second telecommunication terminal (TDM-C), a modem connection between the second telecommunication device during a telephone call terminal and the access computer (G) and / or a further second telecommunication terminal (TDM-C), the data packets being transported via the modem connection using the encrypted transport protocol and messages from the key exchange protocol.
2. Sicherheitsmodul nach Anspruch 1, wobei über die Modemverbindung eine PPP-Verbindung läuft, über welche die Da- tenpakete mittels des verschlüsselten Transportprotokolls sowie Nachrichten des Schlüssel-Austausch-Protokolls transportiert werden.2. Security module according to claim 1, wherein a PPP connection runs over the modem connection, via which the data packets are transported by means of the encrypted transport protocol and messages of the key exchange protocol.
3. Sicherheitsmodul nach Anspruch 1 oder 2, wobei das ver- schlüsselte Transportprotokoll SRTP (= Secure Real Time Protocol) ist.3. Security module according to claim 1 or 2, wherein the encrypted transport protocol is SRTP (= Secure Real Time Protocol).
4. Sicherheitsmodul nach einem der vorhergehenden Ansprüche, wobei das Schlüssel-Austausch-Protokoll MIKEY (= Multime- dia Internet Keying) ist.4. Security module according to one of the preceding claims, wherein the key exchange protocol is MIKEY (= Multimedia Internet Keying).
5. Sicherheitsmodul nach einem der vorhergehenden Ansprüche, wobei das Sicherheitsmodul (SM) derart ausgestaltet ist, dass bei einem Telefongespräch Nachrichten des Schlüssel- Austauch-Protokolls über das SIP-Protokoll (SIP = Session Initiation Protocol) transportiert werden, und die Protokollverarbeitungseinrichtung das SIP-Protokoll verarbeiten kann.5. Security module according to one of the preceding claims, wherein the security module (SM) is configured such that messages of the key exchange protocol are transported via the SIP protocol (SIP = Session Initiation Protocol) during a telephone call, and the protocol processing device the SIP Protocol can process.
6. Sicherheitsmodul nach einem der vorhergehenden Ansprüche, bei dem das Telefonnetz (TDM) ein ISDN-Netz ist.6. Security module according to one of the preceding claims, in which the telephone network (TDM) is an ISDN network.
7. Sicherheitsmodul nach Anspruch 6, bei dem die Modemverbindungseinheit eine Modemverbindung über den B-Kanal im ISDN-Netz aufbauen kann. 7. Security module according to claim 6, in which the modem connection unit can establish a modem connection via the B channel in the ISDN network.
8. Sicherheitsmodul nach einem der vorhergehenden Ansprüche, bei dem das paketorientierte Netz ein IP-basiertes Datennetz, insbesondere ein LAN-Netz (LAN = Local Area Network) , ist .8. Security module according to one of the preceding claims, in which the packet-oriented network is an IP-based data network, in particular a LAN network (LAN = Local Area Network).
9. Sicherheitsmodul nach einem der vorhergehenden Ansprüche, bei dem die Modemverbindungseinheit eine Modemverbindung nach dem V90 und/oder V92-Standard aufbauen kann.9. Security module according to one of the preceding claims, in which the modem connection unit can establish a modem connection according to the V90 and / or V92 standard.
10. Sicherheitsmodul nach einem der vorhergehenden Ansprüche, das für Telefone mit einem Verbindungskabel zwischen Telefonapparat und Telefonhörer eingesetzt wird, wobei das Sicherheitsmodul (SM) derart ausgestaltet ist, dass es in dem Verbindungskabel zwischengeschaltet wird. 10. Security module according to one of the preceding claims, which is used for telephones with a connecting cable between the telephone set and the telephone handset, the security module (SM) being designed such that it is interposed in the connecting cable.
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