Multi-signature Extensions for PGP/MIME

Document Type Expired Internet-Draft (individual)
Author Kazuhiko Yamamoto 
Last updated 1997-05-19
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


PGP/MIME provides single signature service of PGP in the context of MIME, however, multiple signature service is desired for usability and flexibility. For this purpose, this memo defines 'Multipart/PGP-Signature' used as the 'protocol' parameter and the content type of the second part of 'Multipart/Signed'. Canonical MIME format used in PGP/MIME is reasonable but it is not enough for some kinds of MIME objects, particularly for ISO 2022 text. Thus, this memo extends the 'micalg' parameter syntax as 'pgp-<hash-symbol>+<canform-symbol>' so that <canform-symbol> can specify more specific canonicalization for signature calculation.


Kazuhiko Yamamoto (

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