documents as Internet Drafts. Internet Drafts are valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet Drafts as reference material or to cite them other than as ‘‘work in progress’’. To learn the current status of any Internet Draft, please check the 1id-abstracts.txt listing contained in one of the Internet Drafts Shadow Directories on ds.internic.net (US East Coast), venera.isi.edu (US West Coast), munnari.oz.au (Pacific Rim), or nic.nordu.net (Europe). This document defines two new content types for specifying the application of security services to MIME message bodies. MIME, an acronym for "Multipurpose Internet Mail Extensions", defines the format of the contents of Internet mail messages and provides for multi-part textual and non-textual message bodies. The new content types are subtypes of multipart: signed and encrypted. Each will contain two body parts: one for the protected data and one for the control information necessary to remove the protection. Two control information content types are defined, application/signature and application/keys, one for each of the multiparts. The first is to be used when a body part is digitally signed; the second is to be used when a body part is encrypted. The contents of each of the multipart body parts is determined by the value of the protocol parameter, which is required to be present
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