The answer is that the certificate uses SHA-1 for the signature algorithm, which is a critical security vulnerability. The signature algorithm sha1WithRSAEncryption is deprecated because SHA-1 is cryptographically weak and susceptible to collision attacks, allowing an attacker to forge a valid certificate. On the Systems Security Certified Practitioner SSCP exam, this question tests your ability to identify deprecated cryptographic weaknesses in TLS handshake outputs, often as a distractor alongside valid options like AES-128 or ECDHE forward secrecy. A common trap is focusing on expiration dates or key exchange strength instead of the signature hash; remember that SHA-1 is broken for digital signatures, even if the certificate is otherwise valid. For a quick memory tip, think “SHA-1 is a no-go for signatures” — if you see SHA-1 in the signature algorithm field, flag it immediately as a vulnerability.
SSCP Cryptography Practice Question
This SSCP practice question tests your understanding of cryptography. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The certificate uses SHA-1 for the signature algorithm
The signature algorithm sha1WithRSAEncryption is deprecated for certificates; SHA-1 is weak and should not be used. Options A, B, D are incorrect: the certificate is not expired (no date shown), AES-128 is acceptable, and ECDHE provides forward secrecy.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The certificate has expired
Why it's wrong here
No expiration date is shown, but the output does not indicate expiry.
AES-128 is still considered secure for most purposes.
✓
The certificate uses SHA-1 for the signature algorithm
Why this is correct
SHA-1 is deprecated due to collision attacks.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Command / output trap
No expiration date is shown, but the output does not indicate expiry.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SSCP NAT questions on configuration and troubleshooting.
Cryptography — This question tests Cryptography — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The certificate uses SHA-1 for the signature algorithm — The signature algorithm sha1WithRSAEncryption is deprecated for certificates; SHA-1 is weak and should not be used. Options A, B, D are incorrect: the certificate is not expired (no date shown), AES-128 is acceptable, and ECDHE provides forward secrecy.
What should I do if I get this SSCP question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SSCP NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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