Editing Final Report 2011 (section)

===Previous Work===
Two previous attempts at testing ciphers against the code were considered in 2011. These were the examination within the 2009 University of Adelaide Honours Project and the Department of Defence investigation conducted in 1978.
The cryptanalysts from the Department of Defence did not derive any definitive results, they concluded<ref name=InsideStory>''Inside Story'', presented by Stuart Littlemore, ABC TV, 1978.</ref>:
# There are insufficient symbols to provide a pattern.
# The symbols could be a complex substitute code or the meaningless response to a disturbed mind.
# It is not possible to provide a satisfactory answer.
In 2009, the project group investigated transposition ciphers, the One Time Pad, the Vigenère Cipher and the Playfair Cipher. Their conclusion was that transposition ciphers warranted no further investigation, the Vigenère and Playfair Ciphers were unlikely to be have been used but the One Time Pad was plausible<ref name=FinalReport2009>''Final Report 2009'', Bihari, Denley and Turnbull, Andrew, 2009, https://www.eleceng.adelaide.edu.au/personal/dabbott/wiki/index.php/Final_report_2009:_Who_killed_the_Somerton_man%3F</ref>

This year the One Time Pad, the Vigenère Cipher and the Playfair Cipher have been re-examined in greater depth and in acknowledgement of the 2009 results, no additional ciphers were tested that used a transposition methodology.