Defensive design

• Why is it important to use defensive design in programming?

  To keep programs safe from tampering.
• What are the key practices for ensuring program functionality?

  1. Programs should never break.
  2. Programs should never produce errors.
  3. Regular updates and patches are essential.
• What is a challenge faced by programmers in maintaining program integrity?

  It is difficult to achieve consistent functionality.
• What strategies do programmers use to protect their programs?

  • Anticipate user misuse.
  • Ensure well-maintained code.
  • Reduce errors during testing.
• What is the main concern regarding insecure databases?

  They can be a security threat.
• What does input validation check for?

  Whether data meets specific criteria.
• What are the types of input validation checks?

  1. Range check: Validates data within a specified range.
  2. Presence check: Ensures data is not empty.
  3. Format check: Verifies data matches a specific format.
• What does a presence check ensure?

  Data is not empty.
• What is the purpose of a format check?

  To verify data matches a specific format.
• What is the role of a range check?

  • Validates that data falls within a specified range.
  • Helps prevent invalid data entry.
• How can programmers ensure data is entered correctly?

  By implementing input validation checks.
• What are the consequences of not validating input data?

  • Increased risk of errors.
  • Potential security vulnerabilities.
  • Unpredictable program behavior.
• What is the purpose of a format check in input validation?

  To ensure data matches a specific format.
• What does a range check validate?

  That data falls within a specified range.
• What is the significance of checking for acceptable values in data?

  To ensure data is valid and usable.
• What does a length check verify?

  That data has the correct number of characters.
• What are the types of checks used in input validation?

  • Range check
  • Presence check
  • Format check
  • Length check
• What is the purpose of a length check in input validation?

  To verify the number of characters in data.
• How does input validation contribute to program security?

  It prevents unauthorized data entry.
• What are the potential risks of not implementing input validation?

  • Security vulnerabilities
  • Data corruption
  • System crashes
• Why is it important to check for acceptable values in input validation?

  To ensure data is valid and usable.
• What is the role of input validation in programming?

  • Ensures data integrity.
  • Prevents errors and security issues.
  • Validates user input before processing.
• What is the significance of checking email formats in input validation?

  To ensure the email address is valid.
• How can programmers reduce the number of errors in their code?

  By implementing thorough input validation.
• What are the consequences of failing to validate user input?

  • Increased risk of security breaches.
  • Potential for data corruption.
  • Unpredictable program behavior.
• What is the purpose of a format check in input validation?

  To ensure data matches a specific format.
• What does a presence check ensure in input validation?

  That data is not empty.
• What are the types of input validation checks?

  • Range check
  • Presence check
  • Format check
  • Length check
• What is the significance of checking for acceptable values in data?

  To ensure data is valid and usable.
• What does a length check verify?

  That data has the correct number of characters.
• What is the role of a length check in input validation?

  • Verifies the number of characters in data.
  • Helps prevent invalid data entry.
• What is the purpose of a range check in input validation?

  To validate that data falls within a specified range.
• How does input validation contribute to program security?

  It prevents unauthorized data entry.
• What are the potential risks of not implementing input validation?

  • Security vulnerabilities
  • Data corruption
  • System crashes
• Why is it important to check for acceptable values in input validation?

  To ensure data is valid and usable.
• What is the role of input validation in programming?

  • Ensures data integrity.
  • Prevents errors and security issues.
  • Validates user input before processing.
• What is the significance of checking email formats in input validation?

  To ensure the email address is valid.
• How can programmers reduce the number of errors in their code?

  By implementing thorough input validation.
• What are the consequences of failing to validate user input?

  • Increased risk of security breaches.
  • Potential for data corruption.
  • Unpredictable program behavior.
• What does the length check do in the program?

  It checks if the data has the correct format