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Old 11-21-2013, 01:19 AM   #1
hsapoorvaprakash
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Registered: Nov 2013
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Unhappy RSA algorithm query on message length


In RSA algorithm, it is given that plain text size must be less than or equal to ( key size - 11 ).

why it is like that. what is that 11 actually...?
 
Old 11-21-2013, 05:38 AM   #2
linosaurusroot
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http://tools.ietf.org/html/rfc2313

The length of the data D shall not be more than k-11 octets, which is
positive since the length k of the modulus is at least 12 octets.
This limitation guarantees that the length of the padding string PS
is at least eight octets, which is a security condition.
 
  


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