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https://issues.apache.org/jira/browse/PDFBOX-4784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111803#comment-17111803
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Andreas Lehmkühler commented on PDFBOX-4784:
--------------------------------------------

[~mkl], [~bsanchezb] thanks for the explanation. I hoped that those single 
steps might be somehow connected so that we might find a way to "cache" the 
needed information during processing, but obviously those steps are separately 
processed.

[~bsanchezb] Your proposal looks similar to the solution I've had in mind. I'm 
going to merge it soon.

> Possibility to provide the SecureRandom to SecurityHandler
> ----------------------------------------------------------
>
>                 Key: PDFBOX-4784
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4784
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Crypto
>    Affects Versions: 2.0.19
>            Reporter: Pierrick Vandenbroucke
>            Assignee: Andreas Lehmkühler
>            Priority: Major
>             Fix For: 2.0.20, 3.0.0 PDFBox
>
>
> In DSS, we build electronic signatures with two stateless operations 
> (computation of the data to be signed and incorporation of the signature 
> value). Currently, the signature creation fails with encrypted documents 
> (AES) due to the Initialization Vector generations which produce different 
> values at each call.
> We would need a way to "stabilize" this part. We discussed about that on our 
> [issue tracker|https://ec.europa.eu/cefdigital/tracker/browse/DSS-1962] and 
> the idea would be to provide a custom instance of the SecureRandom to the 
> [SecurityHandler|https://github.com/apache/pdfbox/blob/2.0.19/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/SecurityHandler.java#L381].



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