[tor-bugs] #6369 [Analysis]: Gather empirical data on AES/RSA operations performed by typical relays or bridges

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#6369: Gather empirical data on AES/RSA operations performed by typical relays or
bridges
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 Reporter:  karsten   |          Owner:  karsten
     Type:  task      |         Status:  new    
 Priority:  normal    |      Milestone:         
Component:  Analysis  |        Version:         
 Keywords:            |         Parent:         
   Points:            |   Actualpoints:         
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Comment(by karsten):

 I asked a few relay operators on tor-relays to send me part of the log
 line above.  Here are the results (average per second of operation):

 ||'''Fingerprint'''||'''KB written'''||'''onion skins decrypted'''||'''AES
 operations'''||'''AES/RSA ratio'''
 ||8DE5||6208.56||14.25||2384088||167288||
 ||0530||4.99||0.04||1916||48250||
 ||C0ED||32.43||<0.14||12452||88943||
 ||110A||4.00||0.02||1537||74969||
 ||E47B||22.20||0.27||8525||31988||
 ||7C85||25.79||0.23||9901||42929||

 Remarks:
  - The '''KB written''' part comes from bandwidth histories that all
 relays report to the directory authorities.  These histories are in
 15-minute intervals which we can easily break down to a per-second number.
  - '''onion skins decrypted''' comes from the log line reported by relay
 operators.  The per-second number comes from the log timestamp and the
 last restart time as reported by relays to the directory authorities.
  - '''AES operations''' is simply 384 times '''KB written'''.  The
 assumption is that each chunk of 16 written bytes requires 3 AES
 operations, times 2, because for every written byte, the relay also reads
 one byte on average.
  - The '''AES/RSA ratio''' is simply '''AES operations''' divided by
 '''onion skins decrypted'''.

 Does this make sense?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6369#comment:2>
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