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Classification of Boolean functions is a known problem in digital logic. There are far too many possible Boolean functions to examine each one, and so we attempt to classify similar functions together into groups, or classes. This paper continues work that uses the autocorrelation transform to determine a classification technique. Some new considerations are raised and additional analysis of the autocorrelation classes is presented.

The evolution of wireless networks and mobile devices has resulted in increased concerns about performance and security of mobile payment systems. In this paper we propose a new secured architecture for two-party mobile payments, e.g. mobile banking. The proposed architecture employs a lightweight cryptography system that combines public key and symmetric key cryptography systems (ECDSA and AES), as well as a multi-factor authentication mechanism. These are coupled with a transaction log strategy to satisfy the properties of confidentiality, authentication, integrity and non-repudiation. Compared to some existing mobile payment platforms the proposed architecture is a lightweight secured mechanism that is more suitable for two-party banking transactions over resource-limited mobile devices.