In some detail, the paper expounds the principle about simple power analysis (SPA) attacks against the general cryptography and a particular theory against data encryption standard (DES) algorithm.

详细地阐述了对通用密码系统实施简易功耗分析攻击(SPA)的理论基础和对DES算法攻击的特定理论，并提出了对SPA的改进算法。

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That's the theory of Dr Lance Workman, head of psychology at Bath Spa University, who has studied the effects of weather on society's mood.

BBC: Call that a summer?