CCSK: CCSK certification does not have strict prerequisites, although a basic understanding of cloud computing concepts is recommended. It is achieved by passing a single exam administered by the Cloud Security Alliance.
CCSP: CCSP certification requires candidates to have at least five years of cumulative, paid work experience in information technology, including three years of experience in information security and one year of experience in one or more of the six domains of the CCSP Common Body of Knowledge (CBK). Candidates must also pass the CCSP exam.