Added Cyg-Win

2026-06-06 18:46:40 -04:00 · 2026-06-06 18:46:40 -04:00 · 413c315806
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+		    GnuPG and OpenPGP
+		    =================
+
+   See RFC-4880 for a description of OpenPGP.  These notes are older
+   than RFC-4880 and refer to the predecessor of the specs (RFC-2440).
+
+
+  Compatibility Notes
+  ===================
+   GnuPG (>=1.0.3) is in compliance with RFC2440 despite these exceptions:
+
+    * With GnuPG >= 2.1.0 all support for version 3 keys has been
+      removed.  Thus there is no more compatibility with PGP-2.  Users
+      who need to be able to decrypt old PGP 2 messages should use
+      GnuPG 1.4.x along with the option --allow-weak-digest-algos.
+
+    * With GnuPG >= 2.1.0 all signatures (on messages and keys) are
+      created using version 4 signatures.  Support for verifying
+      version 3 signature is still available.
+
+    * (9.2) states that IDEA SHOULD be implemented.  This is not done
+      due to patent problems.
+      UPDATE: Since version 1.4.13 (or GnuPG 2.x with Libgcrypt 1.6)
+              IDEA support has been added to allow decryption of old
+              PGP-2 encrypted material.
+
+   All MAY features are implemented with this exception:
+
+    * multi-part armored messages are not supported.
+      MIME (rfc2015) should be used instead.
+
+   Most of the OPTIONAL stuff is implemented.
+
+   There are a couple of options which can be used to override some
+   RFC requirements.  This is always mentioned with the description
+   of that options.
+
+   A special format of partial packet length exists for v3 packets
+   which can be considered to be in compliance with RFC1991;  this
+   format is only created if a special option is active.
+   UPDATE: This support has been removed with version 1.3.6.
+
+   GnuPG uses a S2K mode of 101 for GNU extensions to the secret key
+   protection algorithms.  This number is not defined in OpenPGP, but
+   given that this number is in a range which is used at many other
+   places in OpenPGP for private/experimental algorithm identifiers,
+   this should be not a too bad choice.  The 3 bytes "GNU" are used to
+   identify this as a GNU extension - see the file DETAILS for a
+   definition of the used data formats.
+
+
+  Some Notes on OpenPGP / PGP Compatibility:
+  ==========================================
+
+     * PGP 5.x does not accept V4 signatures for anything other than
+       key material.  The GnuPG option --force-v3-sigs mimics this
+       behavior.
+
+     * PGP 5.x does not recognize the "five-octet" lengths in
+       new-format headers or in signature subpacket lengths.
+
+     * PGP 5.0 rejects an encrypted session key if the keylength
+       differs from the S2K symmetric algorithm. This is a bug in its
+       validation function.
+
+     * PGP 5.0 does not handle multiple one-pass signature headers and
+       trailers. Signing one will compress the one-pass signed literal
+       and prefix a V3 signature instead of doing a nested one-pass
+       signature.
+
+     * When exporting a private key, PGP 2.x generates the header
+       "BEGIN PGP SECRET KEY BLOCK" instead of "BEGIN PGP PRIVATE KEY
+       BLOCK". All previous versions ignore the implied data type, and
+       look directly at the packet data type.
+
+     * In a clear-signed signature, PGP 5.0 will figure out the correct
+       hash algorithm if there is no "Hash:" header, but it will reject
+       a mismatch between the header and the actual algorithm used. The
+       "standard" (i.e. Zimmermann/Finney/et al.) version of PGP 2.x
+       rejects the "Hash:" header and assumes MD5. There are a number
+       of enhanced variants of PGP 2.6.x that have been modified for
+       SHA-1 signatures.
+
+     * PGP 5.0 can read an RSA key in V4 format, but can only recognize
+       it with a V3 keyid, and can properly use only a V3 format RSA
+       key.
+
+     * Neither PGP 5.x nor PGP 6.0 recognize ElGamal Encrypt and Sign
+       keys. They only handle ElGamal Encrypt-only keys.
+
+
+  Parts of this document are taken from:
+  ======================================
+
+			 OpenPGP Message Format
+		   draft-ietf-openpgp-formats-07.txt
+
+
+   Copyright 1998 by The Internet Society. All Rights Reserved.
+
+   This document and translations of it may be copied and furnished to
+   others, and derivative works that comment on or otherwise explain it
+   or assist in its implementation may be prepared, copied, published
+   and distributed, in whole or in part, without restriction of any
+   kind, provided that the above copyright notice and this paragraph
+   are included on all such copies and derivative works.  However, this
+   document itself may not be modified in any way, such as by removing
+   the copyright notice or references to the Internet Society or other
+   Internet organizations, except as needed for the purpose of
+   developing Internet standards in which case the procedures for
+   copyrights defined in the Internet Standards process must be
+   followed, or as required to translate it into languages other than
+   English.
+
+   The limited permissions granted above are perpetual and will not be
+   revoked by the Internet Society or its successors or assigns.