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I have some sequential id which can be easily guessed. If some want to see data related to this id he has to prove his access by token I gave him before.
token = md5(secret_key + md5(id))
Is MD5 good enough for this job?
Technically one does not even need to md5 the id before concatenation to be secure enough salting.
However I would generally suggest using sha-256 or sha-512 unless one has some serious performance concerns (say embedded programming).