CA2363484A1 - System for securely communicating information packets - Google Patents

System for securely communicating information packets Download PDF

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Publication number
CA2363484A1
CA2363484A1 CA002363484A CA2363484A CA2363484A1 CA 2363484 A1 CA2363484 A1 CA 2363484A1 CA 002363484 A CA002363484 A CA 002363484A CA 2363484 A CA2363484 A CA 2363484A CA 2363484 A1 CA2363484 A1 CA 2363484A1
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CA
Canada
Prior art keywords
key
voice packets
key stream
stream
real time
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.)
Granted
Application number
CA002363484A
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French (fr)
Other versions
CA2363484C (en
Inventor
Alexander Medvinsky
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Arris Technology Inc
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General Instrument Corp
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Filing date
Publication date
Application filed by General Instrument Corp filed Critical General Instrument Corp
Publication of CA2363484A1 publication Critical patent/CA2363484A1/en
Application granted granted Critical
Publication of CA2363484C publication Critical patent/CA2363484C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04L63/0457—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 wherein the sending and receiving network entities apply dynamic encryption, e.g. stream encryption
    • 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
    • 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
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
    • 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
    • H04L9/12—Transmitting and receiving encryption devices synchronised or initially set up in a particular manner
    • 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
    • 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
    • H04M7/0066—Details of access arrangements to the networks
    • H04M7/0069—Details of access arrangements to the networks comprising a residential gateway, e.g. those which provide an adapter for POTS or ISDN terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/30—Compression, e.g. Merkle-Damgard construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/34—Encoding or coding, e.g. Huffman coding or error correction
    • 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

Abstract

A system for securely transmitting Real Time Protocol voice packets to a remote multimedia terminal adapter over an Internet protocol network. The system features an MTA (a local multimedia terminal adapter) having a key stream generator for generating a first key stream used for encrypting the voice packets. The remote multimedia terminal adapter receives and decrypts the voice packets. Also, the system includes a remote key stream generator for generating the first key stream in order to decrypt the encrypted voice packets and a packet decryptor decrypting the encrypted voice packets using the first key stream, wherein both key stream generators are capable of generating a second key stream to prevent reuse of any portion of the first key stream during the communication session.

Claims (22)

1. A system for securely transmitting Real Time Protocol voice packets during a communication session with a remote multimedia terminal adapter over an Internet protocol network, the system comprising:
a local multimedia terminal adapter receiving the voice packets, the local multimedia terminal adapter comprising, a local key stream generator for generating a first key stream;
a packet encryptor that encrypts the voice packets using at least a portion of the first key stream to form encrypted voice packets;
the remote multimedia terminal adapter receiving the encrypted voice packets, the remote multimedia terminal adapters further comprising, a remote key stream generator for generating the first key stream in order to decrypt the encrypted voice packets; and a packet decryptor decrypting the encrypted voice packets using the first key stream, wherein both key stream generators are capable of generating a second key stream to prevent reuse of any portion of the first key stream during the communication session.
2. The system of claim 1 wherein the second key stream is generated when the system wishes to switch from a first to a second coder/decoder for compression/decompression of the voice packets.
3. The system of claim 1 wherein the second key stream is generated when a Message Authentication Code algorithm change occurs.
4. The system of claim 1 further comprising a local gateway controller for forwarding the encrypted packets through the Internet protocol network.
5. The system of claim 1 further comprising a remote gateway controller for receiving the encrypted packets from the Internet protocol network and for forwarding encrypted voice packets to the remote multimedia terminal adapter.

5. A system for communicating Real Time Protocol voice packets between a local and a remote location over an Internet protocol network, the system comprising:
a stream cipher module for encrypting the voice packets; and a key stream generator for generating a first Real Time Protocol key stream, the stream cipher module employing the first key stream to encrypt the voice packets for forwarding to the remote location, the key stream generator producing a second Real Time Protocol key stream for encrypting the voice packets when the system wishes to switch from a first communication parameter to a second communication parameter, each of the first and second parameters being involved in the synchronization of the key stream.
6. The system of claim 6 wherein the first communication parameter is a first coder/decoder that compresses/decompresses the voice packets, and the second communication parameter is a second coder/decoder that compresses/decompresses the voice packets.
7. The system of claim 6 further comprising a synchronization source for synchronizing and enabling decryption of the voice packets at the remote location.
8. The system of claim 8 wherein the synchronization source is a time stamp on a voice packet.
9. The system of claim 9 further comprising a new time stamp sequence generated when the second Real Time Protocol key stream is generated.
10. The system of claim 6 wherein the second key stream is generated by re-executing the following key derivation function:
F(S,"End-End RTP Key Change <N>") where N is a counter incremented whenever a new set of Real Time Protocol keys is re-derived for the same media stream session;
F() is a one-way pseudo-random function used for the purpose of key derivation;
S is a shared secret - a random value shared between the two endpoints and is known only to those two endpoints and possibly a trusted server (e.g. gateway controller);
and "End-End RTP Key Change <N>" is a label that is used as a parameter to the key derivation function F(), <N> stands for an ASCII representation of a decimal number, representing a counter.
11. The system of claim 6 wherein the second key stream is generated by re-executing the following key derivation function:
F(S,SSRC,"End-End RTP Key Change <N>") where:
S is a shared secret - a random value shared between the two endpoints and is known only to those two endpoints and possibly a trusted server (e.g. gateway controller);
SSRC is the synchronization source session identifier;
N is the counter of the number of key changes for the same SSRC value; and "End-End RTP Key Change <N>" is a label that is used as a parameter to the key derivation function F(), <N> stands for an ASCII representation of a decimal number, representing a counter.
12. A method for securely transmitting Real Time Protocol voice packets from a local to a remote location via a communication network, the method comprising:
generating a first Real Time Protocol key stream for encrypting the voice packets;
forwarding encrypted voice packets to the remote location;
generating a second Real Time Protocol key stream for encrypting the voice packets in response to a request to change communication parameters for the same media stream; and forwarding voice packets encrypted with the second Real Time Protocol key stream to the remote location.
13. The method of claim 13 further comprising reinitializing a time stamp for synchronizing decryption of the voice packets.
14. The method of claim 13 wherein the step of generating a second Real Time Protocol key stream is by re-executing the following key derivation function:
F(S,"End-End RTP Key Change <N>") where N is a counter incremented whenever a new set of Real Time Protocol keys is re-derived for the same media stream session;

F( ) is a one-way pseudo-random function used for the purpose of key derivation;;
S is a shared secret - a random value shared between the two endpoints and is known only to those two endpoints and possibly a trusted server (e.g. gateway controller);
and "End-End RTP Key Change <N>" is a label that is used as a parameter to the key derivation function F(), <N> stands for an ASCII representation of a decimal number, representing a counter.
15. The method of claim 13 wherein the step of generating a second Real Time Protocol key stream is by re-executing the following key derivation function:
F(S, SSRC, "End-End RTP Key Change <N>") where:
S is a shared secret - a random value shared between the two endpoints and is known only to those two endpoints and possibly a trusted server (e.g. gateway controller);
SSRC is the synchronization source session identifier;
N is the counter of the number of key changes; and "End-End RTP Key Change <N>" is a label that is used as a parameter to the key derivation function F(), <N> stands for an ASCII representation of a decimal number, representing a counter.
16. In a communication system having a gateway receiving communication sessions from two or more multimedia terminal adapters, a method for securely exchanging voice packets between the multimedia terminal adapters and the gateway, the method comprising:
generating a first Real Time Protocol key stream for encrypting the voice packets;
forwarding the voice packets encrypted with the first Real Time Protocol key stream to the gateway;
generating a second Real Time Protocol key stream for encrypting the voice packets in response to a collision detection wherein the multimedia terminal adapters have the same source identifier; and forwarding voice packets encrypted with the second Real Time Protocol key stream to the remote location.
17. The method of claim 17 wherein the step of generating a second Real Time Protocol key stream is by re-executing the following key derivation function:
F(S, SSRC, "End-End RTP Key Change <N>") where:
S is a shared secret - a random value shared between the two endpoints and is known only to those two endpoints and possibly a trusted server (e.g. gateway controller);
SSRC is the synchronization source session identifier;
N is the counter of the number of key changes; and "End-End RTP Key Change <N>" is a label that is used as a parameter to the key derivation function F(), <N> stands for an ASCII representation of a decimal number, representing a counter.
18. A system for securely transmitting voice packets during a communication session from a local location to a remote location over a communication network, the system comprising:
a means for generating a first key stream at the local location;
a means for encrypting the voice packets using at least a portion of the first key stream to form encrypted voice packets;
a means for forwarding the encrypted voice packets from the local location to the remote location;
a means for generating the first key stream at the remote location in order to decrypt the encrypted voice packets; and a means for decrypting the encrypted voice packets using the first key stream, wherein both means for generating are capable of generating a second key stream to prevent reuse of any portion of the first key stream during the communication.
19. The system of claim 19 wherein the second key stream is generated when the system wishes to switch from a first to a second coder/decoder for compression/decompression of the voice packets.
20. The system of claim 19 wherein the second key stream is generated by re-executing the following key derivation function:
F(S, "End-End RTP Key Change <N>") where N is a counter incremented whenever a new set of Real Time Protocol keys is re-derived for the same media stream session;

F( ) is a one-way pseudo-random function used for the purpose of key derivation;
S is a shared secret - a random value shared between the two endpoints and is known only to those two endpoints and possibly a trusted server (e.g. gateway controller);
and "End-End RTP Key Change <N>" is a label that is used as a parameter to the key derivation function F0, <N> stands for an ASCII representation of a decimal number, representing a counter.
21. The system of claim 19 wherein the second key stream is generated by re-executing the following key derivation function:
F(S, SSRC, "End-End RTP Key Change <N>") where:
S is a shared secret - a random value shared between the two endpoints and is known only to those two endpoints and possibly a trusted server (e.g. gateway controller);
SSRC is the synchronization source session identifier;
N is the counter of the number of key changes; and "End-End RTP Key Change <N>" is a label that is used as a parameter to the key derivation function FU, <N> stands for an ASCII representation of a decimal number, representing a counter.
22. The system of claim 19 further comprising a means for synchronizing the voice packets.
CA2363484A 2001-01-16 2001-11-21 System for securely communicating information packets Expired - Lifetime CA2363484C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/765,108 2001-01-16
US09/765,108 US7684565B2 (en) 2001-01-16 2001-01-16 System for securely communicating information packets

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CA2363484A1 true CA2363484A1 (en) 2002-07-16
CA2363484C CA2363484C (en) 2012-01-24

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US7684565B2 (en) 2010-03-23
US20020094081A1 (en) 2002-07-18
CA2363484C (en) 2012-01-24

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