Complex sentence: For instance to apply a cryptographic hash function in a loop (see pseudo code below) or in some cases if the key is used for a cipher to modify the key schedule (key set-up) in the cipher so it takes one second.
Split into simpler sentences: For instance to apply a cryptographic hash function in a loop (see pseudo code below). Or in some cases if the key is used for a cipher to modify the key schedule (key set-up) in the cipher so it takes one second.