Enlarge key size based on new security requirement #143
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Enlarge default key size for x509 certificate
As mentioned here : 5.3.1 Key Length
https://www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/Publications/TechGuidelines/TG02102/BSI-TR-02102-1.pdf
"The length of the modulus n should be at least 2000 bits for a period of use until 2023 and at least 3000 bits if used beyond 2023."