X.509 is an standard for a public key infrastructure used for authentication and access control. X.509 specifies standard formats for certificates, revocation lists, attribute certificates, and path validation.

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Establishing trust between a device and a developer, TLS signal vs X.509, GnuPG (or both)

Let's say you wanted to implement a "secure sideloading" mechanism for your embedded device so that the device could establish trust with authorized 3rd party developers. Developers would have local ...
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Can Passpoint X.509 certificates be used to MITM SSL connections on Passpoint networks?

Passpoint/Hotspot 2.0 public networks like LinkNYC require users to install X.509 certificates, for EAP authentication. Can these certificates be used by the provider to execute man-in-the middle ...
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Certificate based Access Control for Pub Sub messaging

I'm extending an existing p2p/master Pub Sub framework to support additional security measures, via over the wire encryption and topic based access control. I'd like to use the x.509 certificates that ...
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Deploying software that requires X.509 certificates

I have a self-hosted WCF application, with a server application running on the server (obviously) and a client application that will be installed on the users PC. Up until this point I have been ...
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Why one should prefer EST protocol instead of SCEP?

For many years SCEP was a simple and widely used protocol for obtaining X.509 certificates. However, not too so long ago another protocol called EST (RFC 7030) was developed. What are the main ...
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Trusted CA / smart card authentication on Ubuntu

For SSH connections, I want to validate a smart card certificate against a trusted CA and CRLs. I found tons of documentation on how to enable smart card authentication but most of them focus on ...