Create a strong self-signed certificate for multiple years

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If you follow these steps you can create a self signed certificate with the following specifications:

  • Wildcard certificate
  • SHA256 hash
  • 10 years
  • 2048 bits public key
  • Client and server verification
  • Sha1 fingerprint

Be aware that self-signed certificates can manipulate by a man-in-the-middle. You should not use this in critical production environments.

Please use windows 10 powershell in admin mode. Otherwise you will get errors

New-SelfSignedCertificate -certstorelocation cert:\localmachine\my -dnsname *.domain.local -NotBefore $([datetime]::now.AddDays(-15)) -NotAfter $([datetime]::now.AddDays(3560))

Now export the certificates. Before you copy/paste change the thumbprint with the thumbprint you get from the above command.

$CertPassword = ConvertTo-SecureString -String "YourPassword" -Force –AsPlainText
Export-PfxCertificate -Cert cert:\LocalMachine\My\C6B46CEB7D3A40DB08E78B19FEDD3A24EA7A7919  -FilePath C:\test.pfx -Password $CertPassword
Export-Certificate -Cert Cert:\LocalMachine\My\C6B46CEB7D3A40DB08E78B19FEDD3A24EA7A7919 -FilePath C:\tstcert.cer

Now you can import the PFX with IIS and bind the certificate in IIS.
And import the *.CER in your MMC > Certificates > Computer account > trusted root Certification authority > Certificates

Have fun with your certificate the next 10 years 😀

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Inspiration

Author: Thomas Faddegon

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