Sorry if this is a silly question, but I'm new to all these certificates stuff :)

Let's say I have a digital certificate issued by my company (for email) with:

  • Signature algorithm: md5RSA
  • Public Key: RSA (512 bit)

Is it possible to convert this to use:

  • Signature algorithm: sha1RSA
  • Public Key: RSA (2048 bit)

Or it needs to be recreated by my issuer with the new settings?


It needs to be recreated. Public and private keys are made in pairs at the same time.

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