后端缓存密钥真的需要被哈希？

Question

I'm retrieving data from db and save it in cache under a key = user.id.1

I saw people using md5(key) or salt . md5(key) salt . md5(key) and advising to don't use stronger encryptions methods to don't add overhead.

If someone wants to access your cached data needs access to server, md5 is easily cracked these days, a salt seems to be pointless in this case and hashing the key will still not help with key collision if is the same key.

What's the reason to use a hash for the key?

Thanks

Answer 1

In my opinion there is no need to do that for short keys. Hashing would be good if you're going to cache for example a long select query. It'll be better to keep 32 chars instead of long 200 chars. If you use hash for short key, you will have 32 chars instead of 7 or 10 chars.