[NeutronBoy]

This is suggested every time timing attacks are discussed. This is not a good mitigation. It increases the number of requests required to complete a timing attack, but in the end all of your rand() calls average out and you still see timing differences.

[cousin_it]

OK, then why not have the sensitive operation always take 100ms? If it finishes early, just sleep until the 100ms mark.

[daveloyall]

And in case it takes more than 100ms or a widely variable amount of time: https://news.ycombinator.com/item?id=8691076