“Enclosed please find addresses from Wesendonck. Send your reports to: Mr. Director Karl Hirsch, Kreuzlingen, Switzerland.” Chakravarty, in turn, furnished us with two more codes which were used in writing to these addresses: One which cited pages and word-numbers in a certain German-English dictionary, and a second, based on an entirely different principle. The second and third were often used in the same letter, as this fragment from one of Chakravarty’s reports will show. The letter reads, in part: “50337069403847695228, 265-3, 331-6, 497-2, 337-10-3, 335-14, 77-11.” The first series of figures is written in the third code mentioned, and must be deciphered by using the following square: _1 2 3 4 5 6 7_ _1_ A B C D E F G _2_ H I J K L M N _3_ O P Q R S T U _4_ V W X Y Z Each letter is indicated first by the digit marking the horizontal row in which the letter falls, second by the number of the vertical column. Thus “A” is 1-1, or 11: “K” 2-4, or 24, and so on. But if the Hindu wished to transfer a message in cipher, he would not stop with this simple designation of the letters, for they would recur too often and fall too readily under the “laws of repetition” by which most ciphers can be untangled. So after he had his word translated by this square chart, he added four key numbers to it, those key numbers being fixed and permanent, and being added in rotation. In order that we may find out what this word is, we must therefore subtract the key number thus: _Message_ 50337069403847695228 (or divided into letters) 50 33 70 69 40 38 47 69 52 28 _Key numbers_ 25 11 26 32 25 11 26 32 25 11 _Result_ 25 22 44 37 15 27 21 37 26 17 Consulting our chart again, we see that 25 is “L,” 22 is “I” 44 is “Y,” and that the message deciphers thus: _L I Y U E N H U N G_ The line we quoted above read: “_Li Yuen Hung is now the president of China_” After transmitting the proper-name in the second cipher (as the name of course would not have appeared in the dictionary code), Chakravarty had lapsed back into the first code, as being swifter.