Decrypted Secrets: Methods and Maxims of Cryptology by Dr. rer. nat. Dr. ès sc. h.c. Dr. rer. nat. h.c. mult.

By Dr. rer. nat. Dr. ès sc. h.c. Dr. rer. nat. h.c. mult. Friedrich L. Bauer (auth.)

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Extra info for Decrypted Secrets: Methods and Maxims of Cryptology

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When Wheatstone demonstrated the method now known as PLAYFAIR (Sect. " It should also be borne in mind that many messages need be kept secret only for as long as the events they refer to have not in any case become public knowledge. Admittedly, it may be wiser to keep diplomatic messages secret for decades afterwards. The British- not to mention the Russiansare unsurpassable in this respect, as is the veil of secrecy which they cast over their entire cryptographic system. At any rate, we need only know how long, at least, a cryptanalyst must work on a message to read it- to break the cipher- and then it becomes pointless to maintain that a particular method is absolutely secure.

The message began with 1821 82734 29 30 84541 which (allowing for two enciphering errors) meant "thou image of my heart". It seems that the lovers derived special pleasure from the unnecessary com- plication. However, polyphonic ciphers were used in the ancient civilizations between the Nile and the Euphrates. As the letters of the alphabet also served as number symbols, it was a popular pastime to add up the values of the symbols representing a secret word (gematria). In this way, the isopsephon 666 mentioned in the Apocalypse (Rev.

In the case of Hawaiian, the character set z12 = {a, u, i, o, e, w' h, k, l, m, n, p} is sufficient. In the Middle Ages, following the Latin tradition, 20 letters seem to have been enough for most writers, including Giovanni Battista Porta in 1563 (Fig. 23): Z2o = { a, b, ... , i, l, ... , t, v, z} . Often lkl, lxl, and IY I are included, or just lxl and IY I (Porta at other times). Iw I was long written as lvvl, so making room for l&l, as on Leon Battista Alberti's disc in 1466 (Fig. 26). By 1600 an alphabet of 24 characters had become a European standard, Z24 = Z2o U {k, w, x, y} , with lv I still used for Iu/.

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