Hello everyone! This is Shemihaza, your Sentinel. Today, I'd like to talk about a secret key called 'two-factor authentication,' which protects your valuable online spaces like an impenetrable fortress. Some of you might find it a bit troublesome, but in reality, it's a very powerful ally for protecting your information and money!
Why is 'Two-Factor Authentication' necessary now?
You probably use a login ID and password every day. Do you think that alone is enough to be safe? Unfortunately, we're now in an era where passwords alone can no longer fully prevent unauthorized logins. For example, these dangers lurk:
- ▸① **Password Exposure Risk:** Malicious actors might try many passwords randomly (this is called a 'brute-force attack'), or use passwords leaked from other services to try and log into your accounts. If you reuse passwords, the damage can spread rapidly.
- ▸② **Fear of Account Hijacking:** If someone gets hold of your password, there's a risk your social media accounts could be hijacked, money could be stolen from your online banking, or important personal information could be extracted.
- ▸③ **Unauthorized Use of Your Information:** This can lead to significant damage without your knowledge, such as fraudulent credit card use or purchases you don't recognize on online shopping sites.
This is where 'two-factor authentication' comes in. It's a system that, in addition to logging in with your ID and password, adds another step to verify that it's 'really you' using a different method. Even if your password is leaked, if this second authentication step isn't bypassed, malicious actors can't log in, allowing your information to be securely protected.
Main Types of Two-Factor Authentication and Their Characteristics
Two-factor authentication comes in several types. The available options may vary by service, but I'll introduce the most common ones.
- ▸① **SMS (Short Message Service) Authentication:** A one-time authentication code is sent to your registered mobile phone number. You log in by entering this code. The advantage is easy setup, but recently there have been methods to steal SMS messages, so over-reliance is not advised.
- ▸② **Authenticator App (One-Time Password):** You install a dedicated app on your smartphone, which generates a new authentication code (one-time password) at regular intervals. You log in by entering this code. This method is considered more secure than SMS.
- ▸③ **Biometric Authentication:** This method verifies your identity by reading fingerprint or facial information. It's familiar from things like unlocking your smartphone. Since it uses your unique physical characteristics, it's very secure.
Checkpoints to Protect Yourself
Now, let's check the following points to protect your valuable accounts!
- ✓Check if 'two-factor authentication' is set up for the online services you use (SNS, email, online banking, etc.).
- ✓If 'two-factor authentication' is available, always choose to 'enable it'.
- ✓If a more secure method than SMS authentication is available, such as an authenticator app, prioritize using that.
- ✓If you change your smartphone, remember to research how to transfer two-factor authentication beforehand and reconfigure it on your new device. Keeping backup codes safe is also crucial.
- ✓Even if you receive a message saying 'two-factor authentication has been breached' or are asked to enter an authentication code on a suspicious website, never enter the code or click unknown links. This could be a clever phishing scam.
Where to Seek Help When in Trouble
If you encounter problems, such as falling victim despite having two-factor authentication enabled, or suspecting unauthorized login, don't keep it to yourself—seek help immediately.
Consumer Hotline: 188 (no area code required)
Police Consultation Service: #9110
If you suspect fraudulent credit card use, contact your card company immediately to suspend its use.