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At the Create New Key and Certificate Request window fill in the details. Here is an example,
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Key Label = www.krypton.com Key Size = 2048 Signature Algorithm = SHA1WithRSA Common Name = www.krypton.com Organization = Acme Organizational Unit = Publishing Locality = Toronto State/Province = ON Zipcode = Country or region = CA |
Key Label is the name that shows up in the key store file and is arbitrary. It is recommended to use the domain name since it is unique.
Key Size is set to 2048. Most modern CAs will not accept less than 2048.
Common Name though it is marked as optional is technically not. It must be the domain name of your website.
Warning About the IBM Key Management Utility
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