Keywords: Cryptography Side channel attack Asynchronous design

Regarding the significant mathematical immunity of recent cryptographic algorithms, tem to achieve the intermediate computational data. There are some kinds of attacks which take advantage of the implemented physical properties and leaked information from side channels which are known as side channel attacks [1]. Most of the cryptographic algorithms, which are secure in the realm of mathematical model, have been analyzed by these kinds of attacks, and have been broken down easily [1]. Mobile cryptography devices such as smartcards and mobile 0045-7906/ $- see front matter 2008 Published by Elsevier Ltd