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    <p>Just some random thoughts.</p> <p>While not the only way to do this (off the top of my head you could for example use a HMAC with specific keys, or just a public key algorithm such as RSA or DSA on their own) it is probably the best way to achieve what you want to do with the minimum of effort. </p> <p>Of course I would presume you would act as the CA in this scenario and any third-party could get a certificate signed from you? If not, and would just go for say a Verisign cert etc. you might want to consider checking the key usage and enhanced key usage fields of the certificate to ensure it is suitable for signing binaries (to stop someone for example using an SSL cert). </p> <p>As pointed out in the above comment you want to check any certificate revocation lists, although that might be covered in signed versus unsigned. You probably also want a distinct test case between a file which is unsigned completely, a file which is signed but incorrectly (say public keys don't match) and one which is signed but invalidated, e.g. the signature is not timestamped by a trusted authority and the certificate has expired, or the CRL stuff. </p> <p>Also are you excluding the possibility where the signing cert is the CA? It is a dumb thing to have but technically there is nothing wrong with doing so. You could even just skip the whole CA stuff and get a third party to generate their own self-signed cert and send that to the administrator of the server who would add it to the list of valid certificates for use. The only reason for the CA is they are supposed to check the details of the person who wants it, depending on how you plan to use this system than might not be necessary. </p>
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    1. POLoading only third party trusted assemblies in an Application Server
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    1. COYou might consider an OCSP for handling revocation, I've not used one directly but I think its a newer approach to solving the CRL problem.
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