Question

Which of the following requires no password travel across the internet? (a) Readable system (b) Manipulation system (c) Challenge–response system (d) Response system This question was posed to me in an international level competition. This is a very interesting question from Encryption and Its Applications topic in chapter Database Programming Techniques of Database Management Select the correct answer from above options Interview Questions and Answers, Database Interview Questions and Answers for Freshers and Experience

Answer 1

Correct choice is (c) Challenge–response system The best explanation: The database system sends a challenge string to the user. The user encrypts the challenge string using a secret password as encryption key and then returns the result. The database system can verify the authenticity of the user by decrypting the string with the same secret password and checking the result with the original challenge string.