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I've run into an expression: $x_i \in_R \mathbb{Z}_q$ – and I wonder what this means.

An example paper is here, here's example in Wikipedia.

Can anybody help me? Thanks in advance.

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2  
If no one answers, you may consider providing more context, or even a reference. –  GEdgar Sep 26 '13 at 17:41
    
Oh, sure. References are added. The topic is cryptography. –  Andriy Makukha Sep 26 '13 at 18:15
1  
Just a guess: $\in_R$ means chosen randomly. –  RghtHndSd Sep 26 '13 at 18:16

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