option for pure number as password

Henning Noren — Wed, 12 May 2021 00:51:58 -0000

Dear Eberhard,

As far as I am aware, there is no significant speedup that can be made based on specific character-group-modes (such as all numbers). There is really nothing special about numbers or characters when in comes to the password for a PDF and precomputing for common groups is not feasible due to various factors that always are unique for the PDF (such as document ID).

The solution you suggested of limiting the character set and length is the correct one for these cases.

Kind Regards,
Henning

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option for pure number as password