Certificate-based authentication in IOT Protocols - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is certificate-based authentication?

It is a way to prove identity using digital certificates instead of passwords. Devices or users show a certificate issued by a trusted authority to connect securely.

beginner

What role does a Certificate Authority (CA) play in certificate-based authentication?

A CA issues and signs digital certificates, confirming the identity of devices or users. It acts like a trusted third party that everyone agrees to trust.

intermediate

Why is certificate-based authentication more secure than password-based authentication?

Certificates are hard to guess or steal like passwords. They use cryptography to prove identity, making it safer against hacking or impersonation.

intermediate

What is a private key in certificate-based authentication?

It is a secret key kept only by the device or user. It works with the certificate to prove identity securely without sharing the key itself.

advanced

How does mutual TLS (mTLS) use certificates for authentication?

Both client and server present certificates to each other to verify identities. This two-way check ensures both sides are trusted before communication.

What does a digital certificate prove in certificate-based authentication?

A The network speed

B The password strength

C The identity of a device or user

D The IP address of the device

A digital certificate proves the identity of a device or user by being issued and signed by a trusted authority.

Who issues and signs digital certificates?

A Certificate Authority (CA)

B Internet Service Provider (ISP)

C Device Manufacturer

D End User

The Certificate Authority (CA) is the trusted entity that issues and signs digital certificates.

What is kept secret and never shared in certificate-based authentication?

A Public certificate

B Private key

C Username

D IP address

The private key is kept secret by the device or user and is never shared.

What does mutual TLS (mTLS) ensure?

A Both client and server authenticate each other

B Only the client is authenticated

C Only the server is authenticated

D No authentication is needed

mTLS requires both client and server to present certificates to authenticate each other.

Why is certificate-based authentication preferred over passwords in IoT?

A It uses simpler technology

B It works without internet

C It requires no setup

D It is harder to steal or guess certificates

Certificates use cryptography and are much harder to steal or guess compared to passwords.

Explain how certificate-based authentication works in IoT devices.

Think about how devices prove who they are without passwords.

Describe the benefits of using mutual TLS (mTLS) in secure communication.

Consider why both sides need to trust each other.