Two-factor authentication in Intro to Computing - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Two-factor authentication (2FA)?

Two-factor authentication is a security method that requires two different ways to prove your identity before you can access an account or system. It adds an extra layer of protection beyond just a password.

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Name the three common types of factors used in 2FA.

The three types are: 1) Something you know (like a password), 2) Something you have (like a phone or security token), 3) Something you are (like a fingerprint or face scan).

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Why is 2FA more secure than just using a password?

Because even if someone steals your password, they still need the second factor (like your phone or fingerprint) to access your account. This makes it much harder for attackers to break in.

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Give a real-life analogy for two-factor authentication.

Imagine a locked door that needs both a key and a secret code to open. Even if someone finds the key, they still need the code. This is like 2FA requiring two proofs to enter.

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What is a common example of the 'something you have' factor in 2FA?

A common example is a smartphone app that generates a temporary code, or a text message sent to your phone with a code you must enter.

Which of the following is NOT a factor used in two-factor authentication?

A Something you know

B Something you want

C Something you have

D Something you are

The three factors are something you know, have, or are. 'Something you want' is not a factor.

Why do websites use two-factor authentication?

A To add an extra layer of security

B To make logging in faster

C To collect more personal data

D To avoid using passwords

2FA adds an extra layer of security by requiring two proofs of identity.

Which of these is an example of 'something you are' in 2FA?

A Fingerprint

B Password

C Security token

D Phone number

Biometric data like fingerprints are 'something you are'.

If someone steals your password but you have 2FA enabled, what happens?

A They can access your account easily

B Your password changes automatically

C They still need the second factor to log in

D They get locked out immediately

2FA requires the second factor, so stealing the password alone is not enough.

Which of these is a common method for the second factor in 2FA?

A Answering a security question

B Entering your username

C Typing your password twice

D Receiving a code on your phone

Receiving a code on your phone is a common second factor method.

Explain what two-factor authentication is and why it is important.

Think about how 2FA adds a second lock to your account.

Describe the three types of factors used in two-factor authentication with examples.

Consider knowledge, possession, and biometrics.