-1' OR 5*5=25 or 'TWTomLjH'='

What you posted looks like an SQL injection payload. It’s a small example of how an attacker might try to alter a query’s logic by injecting SQL fragments into user input.

Key ideas behind it:

• -1' tries to terminate an existing string literal in the SQL query. If the application builds SQL by concatenating strings, this can break out of the intended input context.
• OR 5*5=25 is an always-true condition (25 equals 25). By inserting OR with a tautology, the overall WHERE clause can become true for all rows, potentially bypassing authentication or filters.
• The later piece ('TWTomLjH'='... ) is another attempt to add a condition; depending on the surrounding query, it’s another way to force the WHERE clause to evaluate to true or to complicate the logic.

In short: this is a classic tautology-based SQL injection attempt intended to make the query return results regardless of the actual user input.

Defensive notes (how to prevent this in exams or real apps):

• Use parameterized queries (prepared statements) instead of string concatenation for user input.
• Validate and sanitize inputs, preferably with allowlists (whitelists) and length checks.
• Apply least-privilege database accounts (e.g., the app’s DB user should not have rights to modify schema or read unnecessary tables).
• Avoid building dynamic SQL from user input. Use ORM abstractions or proper query builders.
• Implement proper error handling and avoid leaking DB error details to users.
• Consider input encoding/escaping only as a last line of defense, but do not rely on it alone.

Quick examples (safe vs vulnerable patterns):

• Vulnerable (concatenated SQL): query = "SELECT * FROM users WHERE username = '" + user + "' AND password = '" + pass + "'"
• Safe (parameterized): In Python with a DB driver: cursor.execute("SELECT * FROM users WHERE username = %s AND password = %s", (user, pass)) In Java: PreparedStatement ps = conn.prepareStatement("SELECT * FROM users WHERE username = ? AND password = ?"); ps.setString(1, user); ps.setString(2, pass);

If you’d like, tell me your preferred language or framework and I’ll tailor a mini-exam-style question with vulnerable vs fixed code and a short answer key.