The Generate dropdown lets you select RSA or DSA as the public key algorithm. RSA: Generate an RSA key. Uses the RSA internet encryption and authentication system. DSA: Generate a DSA key. Uses the digital signature algorithm (DSA). When done, click the Generate button to generate the certificate as defined at the Generate dropdown. Depending on the encryption method selected (RSA or DSA) here, the HTTPS Certificate > View section displays one of two signature algorithms in effect, either: Signature Algorithm: dsaWithSHA1, or Signature Algorithm: sha1WithRSAEncryption.