Am 22.12.2018 um 12:02 schrieb Gavin Reid:
AES256 is a symmetric cypher, my certificate is only used to encrypt the AES256 key, the AES256 key is generated fresh each time a document is encrypted. Each certificate is for each recipient.
Never mind. In the meantime, I created an AES256 encrypted file with another software so I could see how the result file looks like (the PDF specification is not really clear to me), and I also managed to decrypt it. So the "only" thing missing now is encryption.
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