rfc2943.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.


RFC 2943            TELNET Authentication Using DSA       September 2000


 Client (Party A)                   Server (Party B)

 IAC SB AUTHENTICATION IS
 DSS
 AUTH_CLIENT_TO_SERVER |
     AUTH_HOW_MUTUAL |
     ENCRYPT_OFF |
     INI_CRED_FWD_OFF
 DSS_CERTA_TOKENAB
 Sequence( TokenID, CertA, TokenAB )
 IAC SE                        -->

                                    <-- IAC SB AUTHENTICATION REPLY
                                        DSS
                                        AUTH_CLIENT_TO_SERVER |
                                            AUTH_HOW_MUTUAL |
                                            ENCRYPT_OFF |
                                            INI_CRED_FWD_OFF
                                        DSS_CERTB_TOKENBA2
                                        Sequence( TokenID, CertB,
                                                  TokenBA2 )
                                        IAC SE
---------------------------------------------------------------------
                              Figure 2

4.  ASN.1 Syntax

   As stated earlier, a conformant subset of the defined fields and
   subfields from FIPS PUB 196 have been selected.  This section
   provides the ASN.1 syntax for that conformant subset.

   Figure 1 and Figure 2 include representations of the structures
   defined in this section.  Implementors should refer to the following
   table to determine the ASN.1 definitions that match the figure
   references:

      Figure 1   Sequence( TokenID, TokenBA )           MessageBA
                 Sequence( TokenID, CertA, TokenAB )    MessageAB

      Figure 2   Sequence( TokenID, TokenBA )           MessageBA
                 Sequence( TokenID, CertA, TokenAB )    MessageAB
                 Sequence( TokenID, CertB, TokenBA2 )   MessageBA2

   The following ASN.1 definitions specify the conformant subset of FIPS
   196.  For simplicity, no optional fields or subfields are included.
   The ASN.1 definition for CertificationPath is imported from CCITT
   Recommendation X.509 [X.509], and The ASN.1 definition for Name is
   imported from CCITT Recommendation X.501 [X.501].  These ASN.1



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RFC 2943            TELNET Authentication Using DSA       September 2000


   definitions are not repeated here.  All DSA signature values are
   encoded as a sequence of two integers, employing the same conventions
   specified in RFC 2459, section 7.2.2.

      MessageBA  ::=  SEQUENCE  {
        tokenId       [0] TokenId,
        tokenBA           TokenBA  }

      TokenBA  ::=  SEQUENCE  {
        ranB              RandomNumber,
        timestampB        TimeStamp  }

      MessageAB  ::=  SEQUENCE  {
        tokenId       [0] TokenId,
        certA         [1] CertData,
        tokenAB           TokenAB  }

      TokenAB  ::=  SEQUENCE  {
        ranA              RandomNumber,
        ranB              RandomNumber,
        entityB           EntityName,
        timestampB        TimeStamp,
        absigValue        OCTET STRING  }

      MessageBA2  ::=  SEQUENCE  {
        tokenId       [0] TokenId,
        certB         [1] CertData,
        tokenBA2          TokenBA2  }

      TokenBA2  ::=  SEQUENCE  {
        ranB          [0] RandomNumber,
        ranA          [1] RandomNumber,
        entityA           EntityName,
        timestampB2       TimeStamp,
        ba2sigValue       OCTET STRING  }

      CertData  ::=  SEQUENCE  {
        certPath      [0] CertificationPath  }  -- see X.509

      EntityName  ::=  SEQUENCE OF CHOICE  {    -- only allow one!
        directoryName [4] Name  }               -- see X.501

      RandomNumber  ::=  INTEGER                -- 20 octets








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RFC 2943            TELNET Authentication Using DSA       September 2000


      TokenId  ::=  SEQUENCE  {
        tokenType         INTEGER,              -- see table below
        protoVerNo        INTEGER  }            -- always 0x0001

      TimeStamp  ::=  GeneralizedTime

   The TokenId.TokenType is used to distinguish the message type and the
   authentication type (either unilateral or mutual).  The following
   table provides the values needed to implement this specification:

      Message Type    Authentication Type     TokenId.TokenType

        MessageBA       Unilateral              0x0001
                        Mutual                  0x0011

        MessageAB       Unilateral              0x0002
                        Mutual                  0x0012

        MessageBA       Mutual                  0x0013

5.  Security Considerations

   This entire memo is about security mechanisms.  For DSA to provide
   the authentication discussed, the implementation must protect the
   private key from disclosure.

   Implementations must randomly generate DSS private keys, 'k' values
   used in DSS signatures, and nonces.  The use of inadequate pseudo-
   random number generators (PRNGs) to generate cryptographic values can
   result in little or no security.  An attacker may find it much easier
   to reproduce the PRNG environment that produced the values, searching
   the resulting small set of possibilities, rather than using a brute
   force search.  The generation of quality random numbers is difficult.
   RFC 1750 [RFC1750] offers important guidance in this area, and
   Appendix 3 of FIPS PUB 186 [FIPS186] provides one quality PRNG
   technique.

6.  Acknowledgements

   We would like to thank William Nace for support during implementation
   of this specification.










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RFC 2943            TELNET Authentication Using DSA       September 2000


7. IANA Considerations

   The authentication type DSS and its associated suboption values are
   registered with IANA.  Any suboption values used to extend the
   protocol as described in this document must be registered with IANA
   before use.  IANA is instructed not to issue new suboption values
   without submission of documentation of their use.

8.  References

   FIPS180-1 Secure Hash Standard. FIPS Pub 180-1. April 17, 1995.
             <http://csrc.nist.gov/fips/fips180-1.pdf>

   FIPS186   Digital Signature Standard (DSS). FIPS Pub 186.  May 19,
             1994. <http://csrc.nist.gov/fips/fips186.pdf>

   FIPS196   Standard for Entity Authentication Using Public Key
             Cryptography.  FIPS Pub 196. February 18, 1997.
             <http://csrc.nist.gov/fips/fips196.pdf>

   RFC1750   Eastlake, 3rd, D., Crocker, S. and J. Schiller, "Randomness
             Recommendations for Security", RFC 1750, December 1994.

   RFC2459   Housley, R., Ford, W., Polk, W. and D. Solo, "Internet
             X.509 Public Key Infrastructure: X.509 Certificate and CRL
             Profile", RFC 2459, January 1999.

   RFC2941   T'so, T. and J. Altman, "Telnet Authentication Option", RFC
             2941, September 2000.

   X.208     CCITT.  Recommendation X.208: Specification of Abstract
             Syntax Notation One (ASN.1).  1988.

   X.501     CCITT. Recommendation X.501: The Directory - Models. 1988.

   X.509     CCITT.  Recommendation X.509: The Directory -
             Authentication Framework.  1988.














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RFC 2943            TELNET Authentication Using DSA       September 2000


9.  Authors' Addresses

   Russell Housley
   SPYRUS
   381 Elden Street, Suite 1120
   Herndon, VA 20172
   USA

   EMail: [e-mail]


   Todd Horting
   SPYRUS
   381 Elden Street, Suite 1120
   Herndon, VA 20172
   USA

   EMail: [e-mail]


   Peter Yee
   SPYRUS
   5303 Betsy Ross Drive
   Santa Clara, CA 95054
   USA

   EMail: [e-mail]
























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RFC 2943            TELNET Authentication Using DSA       September 2000


10.  Full Copyright Statement

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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