sf.cu > Definitions > Security Key
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A security key is a multi-factor authentication device that allows access to an account or a system. It is incredibly secure as it is physical. Anyone trying to log into your account needs your security key in order to do so.
It works by using cryptographic algorithms to generate unique codes that are difficult to guess, intercept or steal. Most websites and browsers support it and it is considered essential if you want to take your online security and privacy to the next level.
Security keys are often used along with TOTP as a backup. However, this is not recommended as an attacker who has your TOTP codes can simply use it. There is no need for them to try and get your security key.
A few trusted security key companies are:
Security keys are expensive. They start from $20 and can go up to $100+. However, they are a worthwhile purchase for your security. You should always purchase two. This is because, if one is lost, the other can still be used to login. If you do not do this, you may lose access to your accounts.