An analysis of Spectr-H64 was presented in 2002 by Selçuk Kavut and Melek D Yücel of the Middle East Technical University, showing a method of using a differential attack to retrieve half of the key bits when a single round is used.
A study on Spectr-H64 was conducted in 2002 by Selçuk Kavut and Melek D Yücel from the Middle East Technical University, which proposed a strategy for obtaining half of the key bits through differential attack when using a single round.