It shouldn't be possible to manipulate the ASN.1. The answer to your first question should be no, to the second yes. See this brand-new paper which briefly discusses the desired property of "non-malleability":…
It shouldn't be possible to manipulate the ASN.1. The answer to your first question should be no, to the second yes. See this brand-new paper which briefly discusses the desired property of "non-malleability":…