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-rw-r--r--doc/OpenPGP9
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diff --git a/doc/OpenPGP b/doc/OpenPGP
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@@ -33,6 +33,15 @@
which can be considered to be in compliance with RFC1991; this
format is only created if a special option is active.
+ 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 the fact that this number is in a range which used at many
+ other places in OpenPGP for private/experimenat algorithm identifiers,
+ this should be not a so 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:
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