draft-ietf-tls-psk-null-00.txt   draft-ietf-tls-psk-null-01.txt 
TLS Working Group U. Blumenthal TLS Working Group U. Blumenthal
Internet Draft P. Goel Internet Draft P. Goel
Expires: January 2007 Intel Corporation Expires: March 2007 Intel Corporation
July 19, 2006 September 27, 2006
Pre-Shared Key Cipher Suite with NULL Encryption for Pre-Shared Key Cipher Suites with NULL Encryption for
Transport Layer Security Transport Layer Security (TLS)
draft-ietf-tls-psk-null-00.txt draft-ietf-tls-psk-null-01.txt
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that By submitting this Internet-Draft, each author represents that
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aware have been or will be disclosed, and any of which he or she aware have been or will be disclosed, and any of which he or she
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BCP 79. BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
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This Internet-Draft will expire on January 19, 2007. This Internet-Draft will expire on January 27, 2007.
Abstract Abstract
This document specifies authentication-only cipher suites for the This document specifies authentication-only cipher suites for the
Pre-Shared Key based [TLS-PSK] Transport Layer Security (TLS) [TLS] Pre-Shared Key based Transport Layer Security (TLS) protocol to
protocol to support null encryption. These cipher suites are useful support null encryption. These cipher suites are useful for countries
for countries and places with cryptography-related restrictions. and places with cryptography-related restrictions.
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Conventions used in this document Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
Table of Contents Table of Contents
1. Introduction...................................................2 1. Introduction...................................................2
2. Cipher Usage...................................................2 2. Cipher Usage...................................................2
3. Security Considerations........................................3 3. Security Considerations........................................3
4. IANA Considerations............................................3 4. IANA Considerations............................................3
5. Acknowledgments................................................3 5. Acknowledgments................................................3
6. References.....................................................3 6. References.....................................................4
6.1. Normative References......................................3 6.1. Normative References......................................4
Author's Addresses................................................4 Author's Addresses................................................4
Intellectual Property Statement...................................4 Intellectual Property Statement...................................4
Disclaimer of Validity............................................5 Disclaimer of Validity............................................5
Copyright Statement...............................................5 Copyright Statement...............................................5
Acknowledgment....................................................5 Acknowledgment....................................................5
1. Introduction 1. Introduction
The RFC for Pre-Shared Key based TLS [TLS-PSK] specifies cipher The RFC for Pre-Shared Key based TLS [TLS-PSK] specifies cipher
suites for supporting TLS using pre-shared symmetric keys. However suites for supporting TLS using pre-shared symmetric keys. However
all the cipher suites defined in [TLS-PSK] require encryption. There all the cipher suites defined in [TLS-PSK] require encryption. There
is a need for a cipher suite that supports no encryption. This is is a need for cipher suites that support no encryption. This is
required for implementations to meet import restrictions in some required for implementations to meet import restrictions in some
countries. Even though no encryption is used, this cipher suite countries. Even though no encryption is used, these cipher suites
supports authentication of the client and server to each other, and support authentication of the client and server to each other, and
message integrity. This document augments [TLS-PSK] by adding three message integrity. This document augments [TLS-PSK] by adding three
more cipher suites (PSK, DHE, RSA) with authentication and integrity more cipher suites (PSK, DHE, RSA) with authentication and integrity
only - no encryption. only - no encryption.
2. Cipher Usage 2. Cipher Usage
The new cipher suites proposed here is very similar to cipher suites The new cipher suites proposed here is very similar to cipher suites
defined in [TLS-PSK], except that they define null encryption. defined in [TLS-PSK], except that they define null encryption.
The cipher suites defined here uses the following options for key The cipher suites defined here use the following options for key
exchange and hash part of the protocol: exchange and hash part of the protocol:
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CipherSuite Key Exchange Cipher Hash CipherSuite Key Exchange Cipher Hash
TLS_PSK_WITH_NULL_SHA PSK NULL SHA TLS_PSK_WITH_NULL_SHA PSK NULL SHA
TLS_DHE_PSK_WITH_NULL_SHA DHE_PSK NULL SHA TLS_DHE_PSK_WITH_NULL_SHA DHE_PSK NULL SHA
TLS_RSA_PSK_WITH_NULL_SHA RSA_PSK NULL SHA TLS_RSA_PSK_WITH_NULL_SHA RSA_PSK NULL SHA
For the meaning of the terms PSK please refer to section 1 in [TLS- For the meaning of the terms PSK please refer to section 1 in [TLS-
PSK]. For the meaning of the terms DHE and RSA please refer to PSK]. For the meaning of the terms DHE and RSA please refer to
section 7.4.2 in [TLS]. section 7.4.2 in [TLS].
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This document defines three new cipher suites, whose values are to be This document defines three new cipher suites, whose values are to be
assigned from the TLS Cipher Suite registry defined in [TLS]. assigned from the TLS Cipher Suite registry defined in [TLS].
CipherSuite TLS_PSK_WITH_NULL_SHA = { 0x00, 0xTBD1 }; CipherSuite TLS_PSK_WITH_NULL_SHA = { 0x00, 0xTBD1 };
CipherSuite TLS_DHE_PSK_WITH_NULL_SHA = { 0x00, 0xTBD2 }; CipherSuite TLS_DHE_PSK_WITH_NULL_SHA = { 0x00, 0xTBD2 };
CipherSuite TLS_RSA_PSK_WITH_NULL_SHA = { 0x00, 0xTBD3 }; CipherSuite TLS_RSA_PSK_WITH_NULL_SHA = { 0x00, 0xTBD3 };
5. Acknowledgments 5. Acknowledgments
The cipher suite defined in this document is an augmentation to and The cipher suites defined in this document are an augmentation to and
based on [TLS-PSK]. based on [TLS-PSK].
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6. References 6. References
6.1. Normative References 6.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
[TLS] Dierks, T. and Rescorla, E., "The TLS Protocol Version [TLS] Dierks, T. and Rescorla, E., "The TLS Protocol Version
1.1", RFC 4346, April 2006. 1.1", RFC 4346, April 2006.
[TLS-PSK] Eronen, P., Tschofenig, H., "Pre-Shared Key CipherSuites [TLS-PSK] Eronen, P., Tschofenig, H., "Pre-Shared Key CipherSuites
for Transport Layer Security (TLS)", RFC 4279, December for Transport Layer Security (TLS)", RFC 4279, December
2005. 2005.
Author's Addresses Author's Addresses
Uri Blumenthal Uri Blumenthal
Intel Corporation Intel Corporation
1515 State Route 10, 1515 State Route 10,
3PY1-3.536 PY2-1 10-4
Parsippany, NJ 07054 Parsippany, NJ 07054
USA USA
Email: uri.blumenthal@intel.com Email: Uri.Blumenthal@intel.com
Purushottam Goel Purushottam Goel
Intel Corporation Intel Corporation
2111 N.E. 25 Ave. 2111 N.E. 25 Ave.
JF3-414 JF3-414
Hillsboro, OR 97124 Hillsboro, OR 97124
USA USA
Email: Purushottam.goel@intel.com Email: Purushottam.Goel@intel.com
Intellectual Property Statement Intellectual Property Statement
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pertain to the implementation or use of the technology described in pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has might or might not be available; nor does it represent that it has
Internet-Draft PSK NULL-encryption Cipher Suites for TLS September
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made any independent effort to identify any such rights. Information made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79. found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any Copies of IPR disclosures made to the IETF Secretariat and any
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specification can be obtained from the IETF on-line IPR repository at specification can be obtained from the IETF on-line IPR repository at
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