Military Cryptanalysis by Friedman W.F.

By Friedman W.F.

This booklet offers a superb origin for fixing cipher platforms. The textual content describes the basic ideas of cipher resolution plus use of the unilateral frequency distribution within the answer procedure is roofed in a few element. a number of unilateral and multilateral structures are rigorously mentioned. moreover, the textual content introduces the coed to the answer of digraphic substitution ciphers, together with the answer of the Playfair Cipher. quite a few difficulties are supplied for resolution via the scholar.

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Occasionally one may encounter a cryptogram which is so short that it contains no recurrences even of digraphs, and thus gives no indications of the number of alphabets involved. If the sliding mixed component is known, one may apply the method illustrated in Par. xt and the sliding components to establish a key, if the correspondents are using key words. b. For example, suppose that the presence of the word ENEMYis assumed in the message in Par. 23b above. One proceeds to check it against an unknown key word, sliding the already reconstructed mixed component against the normal and starting with the first letter of the cryptogram, in this manner: When ENEMYequals SF’DZRthen AD successively equals XENFW The sequence 2UDJFWspells no intelligible word.

A in order to produce the plain text of the mm. In the caee at hand both proceasetsare combined: the normal alphabet sequence is continued beneath the lettem of eaoh column and then the generatricem are combined to produce the plain text. The completaly developed generatrix d&rama for the fin& two c&mna are as follows (Fig. 16): e. --After some experif. Combining the selectd menting with these generatrices the 23d generatrix of Column 1 and the 1st of Column 2, which yield the digraphs shown in Fig.

In this case the subscript “1” means the plain component, the subscript “2”, the cipher component, so that the enciphering equation is the following: eJo=&/p; 6~,/~=0,J,,. (49) Page 54 Previous Book Previous Page Home Next Page Next Book 50 c. By setting the two sliding components against each other in the two positions shown below, the cipher alphabets labeled (1) and (2) given by two key letters, A and B, are seen to be different. KAY LETTBJB=A 81 Plain component-- _______Q~~ON~LY~F~~~~~~ON~LYCDF clipher componenf, ______..

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