How to measure how strong the correlation between cloud security policies and privacy requirement in saas and paas to protect those security threat related privacy?
A security policy must be the perfect implementation to protect a system from a determined threat model in accordance with the chapter about multilevel security in Ross Anderson's famous book about security engineering at
https://www.cl.cam.ac.uk/~rja14/book.html
Thus, the correlation between security policy and privacy requirements should achieve 100 percent.
Based on your question asked - seems & assumed is a quantitative research. If yes, generally depends on how you operationalize your "cloud security policies" and "privacy requirement" constructs:
if each of the above 2 constructs consist of some question items, may be you can perform Pearson correlation test (if their data scales are interval / ratio), perform Spearman Rho test (if data scales are ordinal), perform Cramer V test (if data scales are nominal)
If the 2 constructs i.e. "cloud security policies" & "privacy requirement" respectively consists of some latent variables (each latent variable comprises few question items) & they are interconnected between the 2 constructs, may be you want to use Structural Equation Modeling (SEM) like SPSS AMOS or SmartPLS etc.