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You may want to use a separate program to secure your document that meets the specification you want.

See https://freetsa.org/guide/libreoffice-time-stamping.html

Hope this helps

Paul


On 4/9/2017 5:49 PM, Vesselin Kolev wrote:
Dear All,

Since I cannot find a complete answer of my question neither in the
LibreOffice Documentation nor on the Internet, I decided to forward it
to this mailing list.

Is there any way (even through external Java class) to specify the hash
algorithm when requesting TSA based time stamp? At the present
LibreOffice creates a time stamp request based on SHA1. But this hash
algorithm is considered obsolete. Hence that automatically turns the
time stamped PDF into insecure ones. Note that the same problem occurs
with all signature produced by LibreOffice in general - no possibility
to specify the parameters for creating the signature.

Thank you very much in advance for your response!

Best regards,

Vesselin Kolev





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