試験PT0-002 トピック1 問題98 スレッド

The penetration tester recommended the code be updated to use a random salt instead of a fixed salt for hashing passwords. A salt is a random value that is added to the plaintext password before hashing it, to prevent attacks such as rainbow tables or dictionary attacks that rely on precomputed hashes of common or weak passwords. A random salt ensures that each password hash is unique and unpredictable, even if two users have the same password. However, changing the salt does not affect the existing hashes that were created with the old salt, which may still be vulnerable to attacks. Therefore, the penetration tester should recommend changing passwords that were created before this code update, so that they can be hashed with the new salt and be more secure. The other options are not valid steps that the penetration tester should recommend. Keeping hashes created by both methods for compatibility would defeat the purpose of updating the code, as it would leave some hashes vulnerable to attacks. Rehashing all old passwords with the new code would not work, as it would require knowing the plaintext passwords, which are not stored in the database. Replacing the SHA-256 algorithm to something more secure is not necessary, as SHA-256 is a secure and widely used hashing algorithm that has no known vulnerabilities or collisions.