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.
An investigation into Spectr-H64 was carried out in 2002 by Selçuk Kavut and Melek D Yücel of the Middle East Technical University, revealing a method to obtain half of the key bits via differential attack when employing a single round.