[basseq]

Sure, in an ideal world: post the hashes, the salts, the hash algorithm, everything. If it's done "right" (e.g., the hash function has enough complexity), then brute force cracking, rainbow tables, etc. would take so long that it wouldn't be feasible to crack them with any volume.

Of course, you could still crack some (problem), so keeping multiple secrets hidden through obscurity (the hashes, the salts, etc.) is another layer of security.

This doesn't guarantee security, but it's certainly more secure. But it is additive: there's no reason to just use MD5 (or plaintext) because "my hashes are secret".