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MbouchamaFlag for France

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Key size encrypt for exchange 2013

Dear All,
I need to store encrypted information for outlook 2010 user with exchange 2013
what is the best practice for exchange 2013 about Key size
2048 bit RSA  or 4096 bit RSA ?

Thanks in advance
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arnold
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The larger the bit the longer it would take to decode. And consequently the longer it will take to encrypt/decrypt.

The question is whether you are looking to encrypt data being sent or received.
Presumably you have either a CA that is issuing user certificates or each user buys a personal certificate that is then used to encrypt/decrypt messages.
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ASKER

Thanks for your response
we will use the encrypt data for sent and recieve and we use External CA like Thawte
I think probably we will have a issue with performance if we use 4096 bit RSA  ?
what is the best way ?
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arnold
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