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        RFC 1455:

        Title:      Physical Link Security Type of Service
        Author:     D. Eastlake, III
        Mailbox:    dee@ranger.enet.dec.com
        Pages:      6
        Characters: 12,391
        Updates/Obsoletes:  none


This RFC documents an experimental protocol providing a Type of
Service (TOS) to request maximum physical link security.  This is an
addition to the types of service enumerated in RFC 1349: Type of
Service in the Internet Protocol Suite.  The new TOS requests the
network to provide what protection it can against surreptitious
observation by outside agents of traffic so labeled.  The purpose is
protection against traffic analysis and as an additional possible
level of data confidentiality.  This TOS is consistent with all other
defined types of service for IP version 4 in that it is based on link
level characteristics and will not provide any particular guaranteed
level of service.

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.
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Joyce K. Reynolds
USC/Information Sciences Institute