PHP 面试题与答案
Question: So if md5() generates the most secure hash, why would you ever use the less secure crc32() and sha1()?Answer: Crypto usage in PHP is simple, but that doesn't mean it's free. First off, depending on the data that you're encrypting, you might have reasons to store a 32-bit value in the database instead of the 160-bit value to save on space. Second, the more secure the crypto is, the longer is the computation time to deliver the hash value. A high volume site might be significantly slowed down, if frequent md5() generation is required. |
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