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https://issues.apache.org/jira/browse/PDFBOX-4453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16769371#comment-16769371
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Michael Klink commented on PDFBOX-4453:
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{quote}The signature isn't encrypted / decrypted, see "isSignature" in
SecurityHandler.java.
{quote}
The heuristics therein have failed in production, cf.
[DSS-1538|https://ec.europa.eu/cefdigital/tracker/browse/DSS-1538].
> Encrypted string not decrypted
> ------------------------------
>
> Key: PDFBOX-4453
> URL: https://issues.apache.org/jira/browse/PDFBOX-4453
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 1.8.16, 2.0.13
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Critical
> Fix For: 1.8.17, 2.0.14, 3.0.0 PDFBox
>
> Attachments: 2AF-0088-NA-LMF35-40-01-2019-01-18-14-25-52(1).pdf
>
>
> In the attached file, an ancrypted string "0" should be decrypted to "3" but
> it is not.
> * It is RC4 40 bit encryption
> * The string is not decrypted because it is skipped because it is in the
> objects HashSet
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