/**
 * Generate a cryptographically secure random password
 *
 * Creates a password with:
 * - Mixed case letters (a-z, A-Z)
 * - Numbers (0-9)
 * - Special characters (!@#$%^&*)
 * - No ambiguous characters (0, O, l, 1, I) to prevent confusion
 *
 * The password is generated using cryptographically secure random number generation
 * (crypto.randomBytes) to ensure unpredictability.
 *
 * @param length - Password length (default: 16)
 * @returns Secure random password string
 *
 * @example
 * ```typescript
 * // Generate 16-character password (default)
 * const password = generateSecurePassword();
 * // Example output: "Kx9#mP2$vN7@qR4!"
 *
 * // Generate 20-character password
 * const longPassword = generateSecurePassword(20);
 * ```
 *
 * @throws {Error} If length is less than 8 or greater than 128
 */
export declare function generateSecurePassword(length?: number): string;
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