◆ SpookStack

come pent ie we ee bet Mentha ae ao ~ : ‘ . ? . , . . . A ‘ “tA, . . * . "Office Memtoran UM + UNITED STATES GOVERNMENT TO : Rh TT. AFRO iy DATE: ducust TW. 19 - . . a iy* ‘ a5 rrp a re UJ FROM + - suryact: INFORMANT _ | © CODED MESSAGES SENT BY ; . Don nold O MACLEAN AND URGESS fr rention 4s directed to a memorandum from Mr. NICHOLS to Ur. LAND Aated July 26, 1951 concerning eryptoyraphic ideas de- G veloped by on three messages sent by MACLEAN and B British officials who mysteriously disappeared recently in Evrope,. a submitted a strip of paper containing the letters of \Wy the three messages, and words developed by him from these letters. He also submitted a sheet of paper containing the three messages, suspicious aspects of these messages, and his decipherment theory, This material has been listed in the Laboratory as follows: . Ql Strip of white paper bearing letters beginning TMI HTAEADRT R eee* Qc2 Message from MacLean to his wife beginning "Had to leave unexpectedly es.%s Qc3 Message from Burgess to his mother beginning "terribly sorry for my silence ...". Qel, Message from Maclean to his mother beginning - Examination in the Laboratory failed to develop any valid concealed messages. The text is very brief and consequently hampers extensive examination. These three messages seem to be fluent and reasonably free from distortion - characteristics usually absent when open code messages are effected by artifices other than double meaning. The messages could easily contain double noaning signals bat the arbitrary nature of such « concealment procedure and the emall amount of text available precludes the development of valid interpretation along this line, * ‘| fk i i joas ¢ Dd As forage deciphernent theory, his technique will provide almost any desired secret text on any arbitrarily chosen paragraph of normal English text. For example, using the first parts of the three paragraphs of Mr. NICHOLS! memorandum dated July 26, 1951 and combining them in the same manner that uses, the following words can be obtained: "ITALY AND SOVIET WiLL INFORM POWER RUSSIAN DELEGATE TO THE 4 r1 fi SECRET DAY ONE TOLD MAO". 30%