Preventing Malicious API Abuse: Security Measures and Best Practices

In interviews, a common question is how to prevent malicious users from abusing API interfaces.

This article discusses several practical security measures.

1. Firewall

Firewalls filter and control network traffic, blocking invalid packets, DoS/DDoS attacks, malware, phishing, malicious traffic, and network reconnaissance.

2. Captcha

Traditional image captchas can be cracked; more secure sliding captchas are recommended. Overly complex captchas may hinder legitimate users.

Captcha is also widely used for SMS verification, which can be costly if abused.

3. Authentication

Critical APIs should require user login. Permissions can be enforced via custom annotations and gateway interceptors.

4. IP Whitelist

Important APIs (e.g., membership activation) can restrict access to whitelisted IPs, managed via Apollo or a database.

5. Data Encryption

HTTPS replaces HTTP to provide encryption, authentication, and integrity protection.

6. Rate Limiting

SMS sending should be limited per phone number (e.g., one request per 60 seconds and a daily cap). Redis can store counters with expiration.

7. Monitoring

Log API calls and set up alerts for abnormal traffic spikes to enable timely intervention.

8. API Gateway

An API gateway centralizes filtering, authentication, and rate limiting, protecting downstream services.