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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

A security analyst must design a process that allows an AWS Lambda function to verify, during nightly audits, that no Amazon S3 log objects have been altered since they were first stored. The solution must rely on comparing a single, fixed-length value for each object, regardless of whether the log file is 10 KB or 10 GB. Which approach best satisfies this requirement?

  • Encrypt each log file with AES-256 in CBC mode and compare the resulting ciphertext to detect changes.

  • Compute a SHA-256 hash of each log file and store the resulting digest for later comparison.

  • Compress each log file with Gzip and use the checksum contained in the Gzip header for integrity checks.

  • Record the total number of bytes in each log file and verify that the size remains unchanged.

ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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