hardMultiple ChoiceObjective-mapped
SSCP Practice Question: Implements a hybrid encryption scheme to secure…
An organization implements a hybrid encryption scheme to secure sensitive emails. The email body is encrypted with AES-256, and the AES key is encrypted with RSA-2048. What is the primary advantage of this approach?
⚠ Common exam trap
It's easy for candidates to confuse hybrid encryption with forward secrecy or non-repudiation, but hybrid encryption specifically addresses the performance vs. key distribution trade-off, not security properties like forward secrecy or authentication.
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
✓
Combines performance of symmetric with secure key distribution of asymmetric
Hybrid encryption combines the speed of symmetric encryption (AES-256) for bulk data with the secure key distribution of asymmetric encryption (RSA-2048). The symmetric key encrypts the email body efficiently, while the asymmetric key encrypts only the symmetric key, solving the key distribution problem without sacrificing performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ensures forward secrecy
Why it's wrong here
Forward secrecy requires ephemeral key exchange, not static RSA.
- ✗
Simplifies key management by using a single key
Why it's wrong here
Still requires management of both key types.
- ✓
Combines performance of symmetric with secure key distribution of asymmetric
Why this is correct
AES is fast for large data; RSA securely encrypts the key.
- ✗
Provides non-repudiation for the email
Why it's wrong here
Non-repudiation requires digital signatures, not hybrid encryption.
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SSCP exam.