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<?xml version="1.0"?>
<block>
  <name>Extract Cipher Mode Command</name>
  <key>gsm_extract_cmc</key>
  <import>import grgsm</import>
  <make>grgsm.extract_cmc()</make>
  <sink>
    <name>msgs</name>
    <type>message</type>
  </sink>
  <doc>
Extracts the framenumber and the assigned encryption algorithm from Cipher Mode Commands.

Input: decoded control channel messages

The information can be retrieved using following functions:
get_frame_numbers(), get_a5_versions()

</doc>
</block>