- A
ThreadLocalRandom
Why wrong: Intended for concurrent use, not security.
- B
Math.random()
Why wrong: Uses Random, which is not secure.
- C
Random
Why wrong: Not cryptographically secure; predictable.
- D
SecureRandom
SecureRandom is specifically designed for cryptographic use.
Question 497 of 519
1Z0-829 Java I/O API and Securing Applications Practice Question
This 1Z0-829 practice question tests your understanding of java i/o api and securing applications. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
To generate a cryptographically secure random number for a key generation algorithm, which class should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SecureRandom
D is correct because `SecureRandom` is specifically designed to produce cryptographically strong random numbers suitable for key generation, using algorithms like SHA1PRNG or NativePRNG that meet FIPS 140-2 standards. Unlike other random number generators, it ensures unpredictability and resistance to reverse engineering, which is critical for security-sensitive operations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ThreadLocalRandom
Why it's wrong here
Intended for concurrent use, not security.
- ✗
Math.random()
Why it's wrong here
Uses Random, which is not secure.
- ✗
Random
Why it's wrong here
Not cryptographically secure; predictable.
- ✓
SecureRandom
Why this is correct
SecureRandom is specifically designed for cryptographic use.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse general-purpose random number generators (like `Random` or `ThreadLocalRandom`) with cryptographically secure ones, assuming any 'random' class suffices for security, but the exam specifically tests the distinction that only `SecureRandom` meets the cryptographic strength required for key generation.
Detailed technical explanation
How to think about this question
Under the hood, `SecureRandom` can leverage platform-specific entropy sources (e.g., `/dev/random` on Unix, CryptGenRandom on Windows) to seed its algorithm, ensuring high entropy. In real-world scenarios, using `Random` for key generation (e.g., in TLS handshake keys) would expose the system to attacks where an adversary can predict future keys after observing a few outputs. A subtle behavior is that `SecureRandom` may block if insufficient entropy is available, unlike `Random` which never blocks.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Questions learners often ask
What does this 1Z0-829 question test?
Java I/O API and Securing Applications — This question tests Java I/O API and Securing Applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: SecureRandom — D is correct because `SecureRandom` is specifically designed to produce cryptographically strong random numbers suitable for key generation, using algorithms like SHA1PRNG or NativePRNG that meet FIPS 140-2 standards. Unlike other random number generators, it ensures unpredictability and resistance to reverse engineering, which is critical for security-sensitive operations.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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