Which IDS evasion technique involves sending unusual Unicode characters to confuse detection systems?

• A. Unicode Flooding IDS Evasion
• B. Buffer Overflow
• C. SQL Injection
• D. Cross-Site Scripting

Answer: (A)

Evasion of intrusion detection systems through Unicode encoding tricks is the main idea. Unicode flooding IDS evasion uses unusual Unicode characters or encodings to confuse the detector’s normalization and signature matching. When an IDS doesn’t normalize or handles Unicode poorly, these characters can cause the payload to bypass detection or reduce alerting, making this technique a recognized method to slip past defenses. Other options describe direct exploitation of vulnerabilities in applications—buffer overflow, SQL injection, and cross-site scripting—not techniques for dodging IDS detection with encoding tricks.