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10.3 Report of Dr. Rajinder Singh has been assailed by defence on various counts. According to defence, he is not expert in voice recognition and was not authorized to give any such opinion as he was not notified under Section 79-A of Information Technology Act, 2008. It has also been argued that in order to ensure the authenticity of the recording, no hash value was generated either by CBI or by CFSL and, therefore, it is not clear whether recording in question are unedited or unaltered or not. It has been argued by Sh. Manoranjan that Dr. Singh had admitted in his examination that he did not mention the hash value anywhere. It is also argued that as per report that there was no change in the background voice which is quite mystifying. It certainly would have been more appropriate if hash value had been generated by CBI CC No. 05/2016 CNR No. DLCT01-004642-2015 page 30 of 41 and crosschecked by CFSL which would have guaranteed that there was no addition or alteration in the recordings in question.