ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
During threat modeling, you must assign a label to a dataset containing salted, one-way hashes of customer email addresses. Although the hashes alone cannot reveal identities, they can be joined with another internal lookup table to restore the full addresses. Following the organization's four-level classification scheme (Public, Internal, Confidential, Restricted), which label should you apply to ensure the dataset receives appropriate protection throughout its lifecycle?
Because the hashes can be re-identified using the internal lookup table, the dataset is only pseudonymized and still constitutes personally identifiable information. The organization's policy requires any data that can be linked back to an individual to be labeled at least Confidential, which imposes stronger controls than the Internal level. Labeling it Public or Internal would under-protect the data and violate policy, while the Restricted label is reserved for assets that demand even tighter controls than ordinary PII (for example, highly sensitive merger plans or classified designs). Therefore, Confidential is the most appropriate choice.
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What is the purpose of salting in one-way hashes?
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
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