Microsoft Security, Compliance, and Identity Fundamentals SC-900 Practice Question
An Azure development team needs a method to generate a value for each file that can later prove whether the file was modified, but the method must be irreversible so that the original file cannot be recovered from the generated value. Which data-protection approach should they choose?
Enable Azure Storage Service Encryption with customer-managed keys
Generate a cryptographic hash of each file
Encrypt the file by using a symmetric key
Encrypt the file by using an asymmetric public key
Hashing applies a one-way mathematical function to input data and returns a fixed-length digest. The digest changes if any bit in the original data changes, so it can be used to verify integrity. Because the function is one-way, no key exists that can be used to recreate the original file from the hash. Symmetric and asymmetric encryption, as well as Azure Storage Service Encryption, protect confidentiality by producing ciphertext that can be decrypted with the appropriate key, so they do not meet the requirement for an irreversible integrity check.
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Microsoft Security, Compliance, and Identity Fundamentals SC-900
Describe the concepts of security, compliance, and identity
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