title: Recover Mifare Classic key from authentication trace
body: <p>I have been given a Mifare Classic authentication trace and was wondering if there are any tools or tutorials I could use to obtain the key? </p>
  
  <pre><code>Start    | End     | Src | Data
  ---------|---------|-----|--------
  0        | 4704    | Rdr | 60 00 f5 7b
  6708     | 11380   | Tag | 21 91 c4 03
  82240    | 83552   | Rdr | 26
  249792   | 250848  | Rdr | 26
  252020   | 254388  | Tag | 04 00
  333568   | 336032  | Rdr | 93 20
  337204   | 343092  | Tag | 45 c7 a6 23 07
  446208   | 456672  | Rdr | 93 70 45 c7 a6 23 07 f8 f6
  457908   | 461428  | Tag | 88 be 59
  1870544  | 1875248 | Rdr | 60 00 f5 7b
  1877252  | 1881924 | Tag | be fd 8b 22
  1953424  | 1954736 | Rdr | 26
  2120208  | 2121264 | Rdr | 26
  2122452  | 2124820 | Tag | 04 00
  2205152  | 2207616 | Rdr | 93 20
  2208788  | 2214676 | Tag | 45 c7 a6 23 07
  2317024  | 2327488 | Rdr | 93 70 45 c7 a6 23 07 f8 f6
  2328724  | 2332244 | Tag | 88 be 59
  2538400  | 2543104 | Rdr | 60 00 f5 7b
  2545108  | 2549844 | Tag | b3 38 4c d0
  2651552  | 2660864 | Rdr | 55 09 6b fe ec fa ba c2 !crc
  2662100  | 2666836 | Tag | a3! bf! 4f 07
  17282768 |17287536 | Rdr | ef b6 fc 33 !crc
  </code></pre>