Biographical Sketch: Wai Choi, CISSP, is a Senior Software Engineer for IBM in Poughkeepsie, NY where she has worked for 17 years. Wai spent her early years with the company in Function Test and Development and for the past few years, she works in design for digital certificate support in RACF and PKI services. Her extensive expertise focuses on Digital Certificate support for multiple components of z/OS: RACF, PKI services and System SSL. Wai is an active speaker in SHARE, Vanguard, RACF User Groups and multiple IBM hosted events like System z Security Conference and zExpo. She also actively participates in the RACF-L Forum answering certificate-related questions.