The correct action is to digitally sign the file and verify the signature before loading properties. This approach ensures file integrity with digital signatures in Java by using a private key to sign the configuration file and a public key to verify that the file has not been tampered with before calling Properties.load(InputStream). Unlike encryption, which protects confidentiality, digital signing provides both integrity and authenticity, directly addressing the security requirement even if an attacker has bypassed file permissions. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this concept tests your understanding of the java.security package and how to apply cryptographic operations in a real-world context—a common trap is confusing encryption with signing, or assuming file permissions alone are sufficient. Remember the mnemonic: "Sign for integrity, encrypt for secrecy."
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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A Java application running on a server reads configuration from a file 'config.properties' located in the same directory as the JAR. The application uses java.util.Properties.load(InputStream) to read the file. Recently, the file was modified by an unauthorized user, and the application started throwing runtime exceptions due to corrupted property values. The security team requires that the file be protected from unauthorized modifications while still being readable by the application. Which action should be taken to ensure the integrity of the configuration file?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Digitally sign the file and verify the signature before loading properties.
Option D is correct because digital signing provides both integrity and authenticity. By signing the file with a private key and verifying the signature with a public key before calling Properties.load(InputStream), the application can detect any unauthorized modification. This directly addresses the security requirement without relying on encryption (which protects confidentiality, not integrity) or file permissions (which can be bypassed by a privileged attacker).
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.
✗
Encrypt the file using AES and decrypt it in the application.
Why it's wrong here
Encryption protects confidentiality, not integrity; a corrupted encrypted file may still decrypt to garbage.
✗
Set the file permissions to read-only for the application user.
Why it's wrong here
Permissions can be bypassed by a privileged user or if the attacker gains the same user context.
✗
Store the file in a ZIP archive with a checksum.
Why it's wrong here
Checksums without a keyed hash are easily forged; an attacker can recompute the checksum after modifying.
✓
Digitally sign the file and verify the signature before loading properties.
Why this is correct
Digital signatures provide integrity and authenticity; any modification invalidates the signature.
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 confuse encryption (confidentiality) with integrity, or assume file permissions are sufficient, but the exam tests understanding that only digital signing provides non-repudiation and tamper detection against unauthorized modifications.
Detailed technical explanation
How to think about this question
Digital signatures typically use asymmetric cryptography (e.g., RSA or ECDSA) where the signer hashes the file (e.g., SHA-256) and encrypts the hash with their private key. The verifier decrypts the hash with the public key and compares it to a freshly computed hash of the file. In Java, this can be implemented using java.security.Signature with a provider like SunJCE, and the signed file can be stored alongside a .sig file or embedded in a signed JAR. A real-world scenario is verifying a configuration file before loading it into a Properties object to prevent injection of malicious settings.
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: Digitally sign the file and verify the signature before loading properties. — Option D is correct because digital signing provides both integrity and authenticity. By signing the file with a private key and verifying the signature with a public key before calling Properties.load(InputStream), the application can detect any unauthorized modification. This directly addresses the security requirement without relying on encryption (which protects confidentiality, not integrity) or file permissions (which can be bypassed by a privileged attacker).
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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