What you posted looks like an SQL injection payload. Conceptually:

• It tries to close the current string literal in a SQL query (the -1' piece).
• Then it injects an always-true condition (5*5=25 is true) to make the WHERE clause return True for all rows.
• The rest ( 'TWTomLjH'='... ) is another tautology attempt, often used to bypass authentication or leak data.

If a web app builds SQL by concatenating user input, such injections can allow attackers to bypass login, dump data, or corrupt data. I can’t help with crafting or optimizing exploit payloads, but I can help you understand the defenses.

How to defend against SQL injection

• Use parameterized queries / prepared statements. Never concatenate user input into SQL strings.
• Validate and constrain input (e.g., expected formats, length, character sets).
• Use least-privilege database accounts (the app should not own or be able to execute dangerous operations).
• Use an ORM or query builder that handles binding parameters safely.
• Do not reveal detailed error messages to users; log them securely on the server.
• Store passwords securely (never in plaintext); use a strong hashing algorithm (e.g., bcrypt) and verify with proper routines.

language-agnostic example (conceptual, safe)

• Do: SELECT * FROM users WHERE username = ? AND password = ?
• Bind parameters with the actual values from the user (e.g., using a prepared statement).

Practical code examples

Python (sqlite3 or psycopg2) import sqlite3 conn = sqlite3.connect('db.sqlite') cur = conn.cursor()

username = input("Username: ") password = input("Password: ")

Safe: uses parameter binding

cur.execute("SELECT * FROM users WHERE username = ? AND password = ?", (username, password)) user = cur.fetchone() if user: print("Login success") else: print("Invalid credentials")

Notes:

• In production, do not store passwords in plaintext. Store a hash (bcrypt, Argon2) and verify with a proper password-check function.

PHP (PDO) <?php $pdo = new PDO('mysql:host=HOST;dbname=DB', 'USER', 'PASS'); $username = $_POST['username']; $password = $_POST['password'];

// Safe: parameterized query $stmt = $pdo->prepare('SELECT id, password_hash FROM users WHERE username = :username'); $stmt->execute(['username' => $username]); $row = $stmt->fetch(PDO::FETCH_ASSOC);

if ($row && password_verify($password, $row['password_hash'])) { echo "Login success"; } else { echo "Invalid credentials"; } ?>

If you’re studying for an exam, the key takeaways are:

• Understand why untrusted input can break SQL queries.
• Know that parameterized queries are the primary defense.
• Remember to hash passwords and not store them in plaintext.
• Be aware of defense-in-depth: input validation, least privilege, and safe error handling.

If you tell me your exam language (Python, Java, PHP, etc.) I can tailor safe, formatted examples for that environment.