diff --git a/security_300.py b/security_300.py
new file mode 100644
index 0000000..54717a1
--- /dev/null
+++ b/security_300.py
@@ -0,0 +1,22 @@
+# Security Enhancement for Issue #300
+import re
+from typing import Tuple
+
+def validate_email(email: str) -> Tuple[bool, str]:
+    if not email or '@' not in email:
+        return False, "Invalid email"
+    return True, "OK"
+
+def sanitize_input(input_str: str, max_len: int = 1000) -> str:
+    if not input_str:
+        return ""
+    if len(input_str) > max_len:
+        input_str = input_str[:max_len]
+    patterns = [r"<script.*?>.*?</script>", r"javascript:"]
+    for p in patterns:
+        input_str = re.sub(p, "", input_str, flags=re.IGNORECASE)
+    return input_str.strip()
+
+# Tests
+assert validate_email("test@example.com")[0] == True
+print("Security tests passed!")