INTERNET-DRAFT S. Moriai
TLS Working Group Nippon Telegraph and Telephone Corporation
Expires November 2001 May 2001
Addition of the Camellia Encryption Algorithm to TLS
<draft-ietf-tls-camellia-01.txt>
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
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Abstract
This document proposes the addition of new cipher suites to the TLS
protocol 1.0 to support the Camellia encryption algorithm as a bulk
cipher algorithm. Please send comments on this document to the TLS
mailing list.
1. Introduction
This document proposes the addition of new cipher suites to the TLS
protocol 1.0 [4] to support the Camellia encryption algorithm as a
bulk cipher algorithm. This proposal provides a new option for bulk
cipher algorithms.
Camellia is a block cipher with 128-bit block size and 128-, 192-,
and 256-bit key sizes, i.e. the same interface specifications as the
Advanced Encryption Standard (AES). The algorithm description is in
[1][3]. Efficiency on both software and hardware platforms is a
remarkable characteristic of Camellia in addition to its high level
of security. It is confirmed that Camellia provides strong security
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against differential and linear cryptanalysis. An optimized
implementation of Camellia in assembly language can encrypt on a
Pentium III (1.13GHz) at the rate of 471 Mbits per second. In
addition, a distinguishing feature is its small hardware design.
The hardware design, which includes the parts for key schedule,
encryption and decryption, occupies only 9.66K gates using a 0.35um
CMOS ASIC library, which is in the smallest class among all existing
128-bit block ciphers as far as we know [2].
2. Cipher Suites
We propose the new cipher suites below following the AES
ciphersuites.
CipherSuite TLS_RSA_WITH_CAMELLIA_128_CBC_SHA = { 0x00,0x41 };
CipherSuite TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA = { 0x00,0x42 };
CipherSuite TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA = { 0x00,0x43 };
CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA = { 0x00,0x44 };
CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA = { 0x00,0x45 };
CipherSuite TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA = { 0x00,0x46 };
CipherSuite TLS_RSA_WITH_CAMELLIA_256_CBC_SHA = { 0x00,0x47 };
CipherSuite TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA = { 0x00,0x48 };
CipherSuite TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA = { 0x00,0x49 };
CipherSuite TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA = { 0x00,0x4A };
CipherSuite TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA = { 0x00,0x4B };
CipherSuite TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA = { 0x00,0x4C };
Note: The above numeric definitions for Cipher Suites have not yet
been registered. The numeric definitions follow the numbers given
in the CipherSuite of the TLS standard.
3. CipherSuite Definitions
CipherSuite Is Key Cipher Hash
Exportable Exchange
TLS_RSA_WITH_CAMELLIA_128_CBC_SHA RSA CAMELLIA_128_CBC SHA
TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA DH_DSS CAMELLIA_128_CBC SHA
TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA DH_RSA CAMELLIA_128_CBC SHA
TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA DHE_DSS CAMELLIA_128_CBC SHA
TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA DHE_RSA CAMELLIA_128_CBC SHA
TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA DH_anon CAMELLIA_128_CBC SHA
TLS_RSA_WITH_CAMELLIA_256_CBC_SHA RSA CAMELLIA_256_CBC SHA
TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA DH_DSS CAMELLIA_256_CBC SHA
TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA DH_RSA CAMELLIA_256_CBC SHA
TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA DHE_DSS CAMELLIA_256_CBC SHA
TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA DHE_RSA CAMELLIA_256_CBC SHA
TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA DH_anon CAMELLIA_256_CBC SHA
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Key Expanded Effective IV Block
Cipher Type Material Key Material Key Bits Size Size
CAMELLIA_128_CBC Block 16 16 128 16 16
CAMELLIA_256_CBC Block 32 32 256 16 16
Note: Key Exchange Algorithms and Hash Functions are defined in TLS.
4. Security Considerations
Security considerations except Camellia are discussed in [4]. The
security of Camellia is evaluated by utilizing state-of-the-art
cryptanalytic techniques. We confirmed that Camellia has no
differential and linear characteristics that hold with probability
more than 2^(-128), which means that it is extremely unlikely that
differential and linear attacks will succeed against Camellia.
Moreover, Camellia was designed to offer security against other
advanced cryptanalytic attacks including higher order differential
attacks, interpolation attacks, related-key attacks, truncated
differential attacks, and so on [3].
5. Intellectual Property Statement
Mitsubishi Electric Corporation (Mitsubishi Electric) and Nippon
Telegraph and Telephone Corporation (NTT) have pending applications
or filed patents which are essential to Camellia. License policy
for these essential patents declared formally by NTT and Mitsubishi
Electric will be available on the IETF page of Intellectual Property
Rights Notices.
References
[1] K. Aoki, T. Ichikawa, M. Kanda, M. Matsui, S. Moriai,
J. Nakajima, and T. Tokita
``Specification of Camellia --- a 128-bit Block Cipher'',
2000. http://info.isl.ntt.co.jp/camellia/
[2] K. Aoki, T. Ichikawa, M. Kanda, M. Matsui, S. Moriai,
J. Nakajima, and T. Tokita
``Camellia: A 128-Bit Block Cipher Suitable for Multiple
Platforms'', 2000. http://info.isl.ntt.co.jp/camellia/
[3] K. Aoki, T. Ichikawa, M. Kanda, M. Matsui, S. Moriai,
J. Nakajima, and T. Tokita
``Camellia: A 128-Bit Block Cipher Suitable for Multiple
Platforms --- Design and Analysis ---'', In Selected Areas in
Cryptography, 7th Annual International Workshop, SAC 2000,
Waterloo, Ontario, Canada, August 2000, Proceedings,
Lecture Notes in Computer Science 2012, pp.39--56,
Springer-Verlag, 2001.
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[4] T. Dierks, and C. Allen, ``The TLS Protocol Version 1.0'', RFC
2246, January 1999.
Author's Addresses
Shiho Moriai
Nippon Telegraph and Telephone Corporation
1-1 Hikarinooka, Yokosuka, 239-0847, Japan
Phone: +81-468-59-2007
FAX: +81-468-59-3858
Email: shiho@isl.ntt.co.jp
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