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ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question

While vetting a newly added third-party JAR before integration, you run an entropy scan across its class files. Most files average 4-5 bits of entropy per byte, but one 70 KB class shows a uniform distribution near 8 bits per byte. From a secure code-review perspective, what risk does this anomaly most strongly suggest?

  • The class simply contains an efficient Bloom filter table generated at build time.

  • The file may hide a packed or encrypted malicious payload inserted by an attacker.

  • The compiler applied aggressive dead-code elimination, leaving random padding that increases entropy.

  • The library developer enabled standard Java bytecode obfuscation for intellectual-property protection.

ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Implementation
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