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You can have a backup certificate from a different CA but you cannot serve multiple leaf certificates (i.e. certificates matching the hostname) within the same TLS connection. You can also not have multiple signatures (i.e. by different CA's) on the same certificate which is a similar question often asked in this context. But you could use different ...


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TLS only allows a single cert. You'd need to have some monitoring in place to check for this issue and automatically reconfigure your web server upon occurrence. You can get the same CSR signed by multiple CAs. Each time you will get a separate cert signed by that single CA. You are likely better off with completely independent keypairs and CSRs for each ...


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I think I have a better understanding of what you asking now: Having "a trust this computer" is not really a security weakness. This feature is to tell the company that this is a common computer you log in from and more of a user convenience. In order to have malicious software perform this check in your place, they would need to perform Session Hijacking. ...


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There are different types of two factor authentication. Some types will protect against the threat you describe, others will not. Here are some common types of 2FA that will keep you protected against the key logger: Texting a one time use code to a mobile phone. Emailing a one time use code with the assumption that the user will not check the email on ...



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