Add Digital Signature (S/MIME + RSA-PSS padding) to outgoing email in Exchange Server 2003/2007/2010/2013/2016/2019 and IIS SMTP Service - Sign Email
CSS Padding - Scaler Topics
So What Are RSA PKCS#1.5, RSA OAEP and RSA PSS — And Why Is It Important To Pick The Right One? | by Prof Bill Buchanan OBE | ASecuritySite: When Bob Met Alice | Medium