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decisional composite residuosity assumption : ウィキペディア英語版
decisional composite residuosity assumption
The decisional composite residuosity assumption (DCRA) is a mathematical assumption used in cryptography. In particular, the assumption is used in the proof of the Paillier cryptosystem.
Informally the DCRA states that given a composite ''n'' and an integer ''z'', it is hard to decide whether ''z'' is a ''n''-residue modulo ''n''2 or not, i.e., whether there exists ''y'' such that
: z \equiv y^n \pmod. \,
== See also ==

* Computational hardness assumption
* Quadratic residuosity problem
* Higher residuosity problem

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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