RFC 1412 (rfc1412) - Page 1 of 4

Telnet Authentication: SPX

Network Working Group                                       K. Alagappan
Request for Comments: 1412                 Digital Equipment Corporation
                                                            January 1993


                       Telnet Authentication: SPX

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  Discussion and suggestions for improvement are requested.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

1. Command Names and Codes

   Authentication Types

      SPX          3

   Suboption Commands

      AUTH         0
      REJECT       1
      ACCEPT       2

2.  Command Meanings

   IAC SB AUTHENTICATION IS  AUTH
    IAC SE

      This is used to pass the SPX authentication token to the remote
      side of the connection.  (A document which describes the
      authentication token syntax is forthcoming.)  The first octet of
      the  value is SPX.  The second octet is
      a modifier to the SPX authentication type.

   IAC SB AUTHENTICATION REPLY  ACCEPT
    IAC SE

      This command indicates that the authentication was successful.
      After an SPX authentication exchange, both sides have securely
      established a random 8-byte key to be used as the default key for
      the ENCRYPTION option.  If the AUTH_HOW_MUTUAL bit is set in the
      second octet of the authentication-type-pair, the sender includes
      the mutual response bytes.  The receiver of the ACCEPT command
      compares the "mutual response" with its expected mutual response.



Telnet Working Group