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pgg: Selecting an implementation

 
 3.2 Selecting an implementation
 ===============================
 
 Since PGP has a long history and there are a number of PGP
 implementations available today, the function which each one has differs
 considerably.  For example, if you are using GnuPG, you know you can
 select cipher algorithm from 3DES, CAST5, BLOWFISH, and so on, but on
 the other hand the version 2 of PGP only supports IDEA.
 
    Which implementation is used is controlled by the ‘pgg-scheme’
 variable.  If it is ‘nil’ (the default), the value of the
 ‘pgg-default-scheme’ variable will be used instead.
 
  -- Variable: pgg-scheme
      Force specify the scheme of PGP implementation.  The value can be
      set to ‘gpg’, ‘pgp’, and ‘pgp5’.  The default is ‘nil’.
 
  -- Variable: pgg-default-scheme
      The default scheme of PGP implementation.  The value should be one
      of ‘gpg’, ‘pgp’, and ‘pgp5’.  The default is ‘gpg’.
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