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The only possible answer to this is to check out the OpenPGP format and see if the message adheres to that format. You may need to build in some mechanisms to filter out tiny mistakes or extensions in the message though. As Open PGP is, well, open, there should be plenty libraries that perform this parsing for you. Library recommendations are off topic here ...


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As for the first reason: in the future you probably need the decompressed form of the message. There won't be much you can do with the compressed message. But PGP is application level; you may want to verify that message at any time. Now you may want to verify the signature over that decompressed data without compressing it first. E.g. it's a good use case ...



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