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.
Exhibit
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
try (CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("data.enc"), cipher)) {
Files.copy(Path.of("data.txt"), cos);
}
Refer to the exhibit. What is the purpose of this code?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Encrypt data.txt and write to data.enc
The code uses a CipherOutputStream with a cipher initialized in ENCRYPT_MODE, reading from data.txt and writing to data.enc, thus encrypting the plaintext file and producing an encrypted output file. This is the standard pattern for file encryption in Java using the JCA (Java Cryptography Architecture).
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.
✗
Compress data.txt and write to data.enc
Why it's wrong here
CipherOutputStream performs encryption, not compression.
✓
Encrypt data.txt and write to data.enc
Why this is correct
The cipher is in encrypt mode, and data from data.txt is written to data.enc via CipherOutputStream.
Related concept
Read the scenario before looking for a memorised answer.
✗
Encrypt data.enc and write to data.txt
Why it's wrong here
The source is data.txt and target is data.enc, not the other way.
✗
Decrypt data.txt and write to data.enc
Why it's wrong here
Cipher is in ENCRYPT_MODE, so it encrypts, not decrypts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between encryption and compression, and the direction of the cipher mode (ENCRYPT vs DECRYPT) relative to the input/output file names, leading candidates to confuse the source and destination or the operation type.
Trap categories for this question
Command / output trap
CipherOutputStream performs encryption, not compression.
Detailed technical explanation
How to think about this question
Under the hood, CipherOutputStream wraps an underlying OutputStream and applies the cipher's update/doFinal methods during write operations, handling block cipher padding (e.g., PKCS5Padding) automatically. A subtle behavior is that if the cipher requires a secure random initialization vector (IV), the code must explicitly set it via IvParameterSpec; otherwise, a default IV may be used, which can be insecure in repeated encryptions.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Encrypt data.txt and write to data.enc — The code uses a CipherOutputStream with a cipher initialized in ENCRYPT_MODE, reading from data.txt and writing to data.enc, thus encrypting the plaintext file and producing an encrypted output file. This is the standard pattern for file encryption in Java using the JCA (Java Cryptography Architecture).
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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Question Discussion
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