Title: UTF-7 - A Mail-Safe Transformation Format of Unicode
Author(s): D. Goldsmith, M. Davis.
Status: EXPERIMENTAL
Date: Jul 1994
Length: 29573
Obsoleted by: RFC2152
The Unicode Standard, version 1.1, and ISO/IEC 10646-1:1993(E) jointly define a 16 bit character set (hereafter referred to as Unicode) which encompasses most of the world's writing systems. However, Internet mail (STD 11, RFC822) currently supports only 7- bit US ASCII as a character set. MIME (RFC1521 and RFC1522) extends Internet mail to support different media types and character sets, and thus could support Unicode in mail messages. MIME neither defines Unicode as a permitted character set nor specifies how it would be encoded, although it does provide for the registration of additional character sets over time.
This document describes a new transformation format of Unicode that contains only 7-bit ASCII characters and is intended to be readable by humans in the limiting case that the document consists of characters from the US-ASCII repertoire. It also specifies how this transformation format is used in the context of RFC1521, RFC1522, and the document "Using Unicode with MIME".
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