International Association for Cryptologic Research

International Association
for Cryptologic Research


Daoben Li


An Improved Elegant Method to Re-initialize Hash Chains
Yuanchao Zhao Daoben Li
Hash chains are widely used in various cryptographic systems such as electronic micropayments and one-time passwords etc. However, hash chains suffer from the limitation that they have a finite number of links which when used up requires the system to re-initialize new hash chains. So system design has to reduce the overhead when hash chains are re-initialized. Recently, Vipul Goyal proposed an elegant one-time-signature-based method to re-initialize hash chains, in this efficient method an infinite number of finite length hash chains can be tied together so that hash chains can be securely re-initialized in a non-repudiable manner. Vipul Goyal??s method is improved in this paper to reach a little more efficient method, which, more importantly, is a natural extension of the concept of conventional hash chains.


Yuanchao Zhao (1)