Using the theorem of linear Diophantine equations and the Chinese remainder theorem, we have constructed a class of trap-door knapsack public-key cryptosystems, which have a better security.

利用不定方程理论及中国剩余定理，我们设计了一类陷门背包公开钥密码系统，它们具有更好的安全性。

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The country's booming middle-class have virtually seceded from public services - they avoid government hospitals and public transport, hire private security and run private generators for their electricity - and the poor bear the brunt of the miserable services.

BBC: Will cash transfers work in India?