The answer is XML digital signatures, as they are a necessary component for implementing SAML-based identity federation because they ensure the integrity and authenticity of the SAML assertion exchanged between the Identity Provider (IdP) and the Service Provider (SP). Without XML digital signatures, the SP cannot cryptographically verify that the assertion was issued by the trusted IdP and has not been tampered with during transit, which is the core of the trust relationship in SAML federation. On the CISSP exam, this concept tests your understanding of how cryptographic controls enforce trust in federated identity systems, often appearing in domain 4 (Identity and Access Management) as a scenario where you must distinguish between required federation components and optional features like encryption. A common trap is confusing XML encryption with XML signatures—remember that signatures provide non-repudiation and integrity, while encryption is optional for confidentiality. Memory tip: “Signatures seal the deal” between IdP and SP.
CISSP Identity and Access Management Practice Question
This CISSP practice question tests your understanding of identity and access management. 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.
An organization plans to allow employees to access third-party SaaS applications using their corporate credentials. Which THREE are necessary components for implementing SAML-based identity federation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Service Provider (SP)
Option A is correct because the Service Provider (SP) is the entity that hosts the SaaS application and relies on the Identity Provider (IdP) to authenticate users. In SAML-based identity federation, the SP receives a SAML assertion from the IdP and uses it to grant access, making it a necessary component of the trust relationship.
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.
✓
Service Provider (SP)
Why this is correct
The SP consumes SAML assertions to grant access to the application.
Related concept
Read the scenario before looking for a memorised answer.
✗
Bcrypt password hashing
Why it's wrong here
Bcrypt is a password hashing algorithm, not a component of SAML.
✓
Identity Provider (IdP)
Why this is correct
The IdP authenticates users and issues SAML assertions.
Related concept
Read the scenario before looking for a memorised answer.
✗
RADIUS server
Why it's wrong here
RADIUS is used for network access control, not for SAML-based web SSO.
✓
XML digital signatures
Why this is correct
SAML assertions are signed using XML digital signatures for integrity and non-repudiation.
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 authentication protocols (like RADIUS or password hashing) with federation components, forgetting that SAML is an XML-based assertion framework that requires an IdP, SP, and digital signatures, not network-level or storage mechanisms.
Detailed technical explanation
How to think about this question
SAML 2.0 uses XML digital signatures (option E) to ensure the integrity and authenticity of assertions, preventing tampering during transmission between the IdP and SP. The IdP (option C) generates a signed SAML response containing the user's identity and attributes, which the SP validates using the IdP's public key certificate. In real-world deployments, the SP must pre-configure a trust relationship with the IdP, often via metadata exchange that includes certificate fingerprints and endpoint URLs.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Identity and Access Management — This question tests Identity and Access Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Service Provider (SP) — Option A is correct because the Service Provider (SP) is the entity that hosts the SaaS application and relies on the Identity Provider (IdP) to authenticate users. In SAML-based identity federation, the SP receives a SAML assertion from the IdP and uses it to grant access, making it a necessary component of the trust relationship.
What should I do if I get this CISSP 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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