Difference between revisions of "Willi Meier"

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(Created page with "'''Title''' Near-colliding Keys in RC4 '''Abstract ''' Search of key collisions in the RC4 stream cipher has been an active area. We investigate near-colliding keys tha...")
 
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'''Abstract  '''
 
'''Abstract  '''
  
Search of key collisions in the RC4 stream cipher has been an active area.
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Search of key collisions in the RC4 stream cipher has been an active area. We investigate near-colliding keys that lead to related states after key scheduling and related key stream bytes.
 
 
We investigate near-colliding keys that lead to related states after key scheduling and related key stream bytes.
 
 
 
 
Our investigation reveals that near-colliding states do not necessarily lead to near-colliding key streams.
 
Our investigation reveals that near-colliding states do not necessarily lead to near-colliding key streams.
 
 
From this motivation, we present practical methods to find a related key pair with differences in two bytes,
 
From this motivation, we present practical methods to find a related key pair with differences in two bytes,
 
 
that leads to a large number of matches in the initial key stream. In the process, we discover a class of related key
 
that leads to a large number of matches in the initial key stream. In the process, we discover a class of related key
 
 
distinguishers for RC4. The best one of these shows that given a random key and a related one to that
 
distinguishers for RC4. The best one of these shows that given a random key and a related one to that
 
 
(the last two bytes increased and decreased by 1 respectively), the first pair of bytes corresponding to the
 
(the last two bytes increased and decreased by 1 respectively), the first pair of bytes corresponding to the
 
 
related keys are the same with significant probability (e.g., approximately 0.011 for 16-byte keys to 0.044 for 30-byte keys).
 
related keys are the same with significant probability (e.g., approximately 0.011 for 16-byte keys to 0.044 for 30-byte keys).

Revision as of 16:04, 12 January 2013

Title Near-colliding Keys in RC4


Abstract

Search of key collisions in the RC4 stream cipher has been an active area. We investigate near-colliding keys that lead to related states after key scheduling and related key stream bytes. Our investigation reveals that near-colliding states do not necessarily lead to near-colliding key streams. From this motivation, we present practical methods to find a related key pair with differences in two bytes, that leads to a large number of matches in the initial key stream. In the process, we discover a class of related key distinguishers for RC4. The best one of these shows that given a random key and a related one to that (the last two bytes increased and decreased by 1 respectively), the first pair of bytes corresponding to the related keys are the same with significant probability (e.g., approximately 0.011 for 16-byte keys to 0.044 for 30-byte keys).