I recently came across this term and after some research found this article which states the following:
An alternative approach, called key strengthening, extends the key with a random salt, but then (unlike in key stretching) securely deletes the salt. This forces both the attacker and legitimate users to perform a brute-force search for the salt value
That made me wonder, what's the point of using such an approach rather than the traditional key stretching? Are there any real applications employing this method?