Of course you can use X.509 certificates without AS JAVA and without SAP SSO (the product). You will then just need to figure out how to generate and deploy the certificates to your users assuming you don't already have a PKI within your company. With SAP SSO that happens automatically. Correct, ABAP SPNEGO doesn't require SLS. You can use ABAP SPNEGO assuming you purchase SAP SSO licenses and your system meets the requirements (version, SP level, kernel, etc).
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