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ISC Identity And Access Management Architecture Practice Question

An architect is designing an OAuth 2.0 implementation for a mobile application. To prevent authorization code injection attacks, which specific configuration must be enforced in the client registration?

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

✓

Enable Proof Key for Code Exchange (PKCE) enforcement

PKCE (Proof Key for Code Exchange) is the standard defense against authorization code interception attacks in public clients, replacing the need for a client secret.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Enable Proof Key for Code Exchange (PKCE) enforcement
Why this is correct
PKCE is required for mobile clients to secure the authorization code exchange process.
✗
Set a short expiration time for the client_secret
Why it's wrong here
Mobile apps are public clients and should not rely on client secrets.
✗
Require signed JWTs for the request object
Why it's wrong here
While recommended, it does not specifically address authorization code injection as effectively as PKCE.
✗
Implement Mutual TLS (mTLS) for the token endpoint
Why it's wrong here
mTLS is typically used for confidential clients or service-to-service communication, not standard mobile apps.

About these practice questions

This ISC question is part of Courseiva's 208-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →

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Written and reviewed by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

Last reviewed August 2026 · checked against the official (ISC)² exam blueprint

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This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.