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Polygraphiae libri VI.
... 106-188]. Reading such authors as Johannes Trithemius [62,63], Giambattista Della Porta [10,11], Gustavus Selenus, 9 Blaise Vigenère [67], and Falconere [17], I was struck by the great variety of techniques they provide. A considerable portion of these consist of simple monoalphabetic substitutions or transpositions of the letters of the plain text-methods that can be easily cracked by frequency analysis and vowel identification algorithms. ...
The Codex of Rohonc is a lengthy handwritten book filled with unknown sign-strings and more than 80 seemingly biblical illustrations. Nothing is known about the provenance of the manuscript; its Hungarian or even East-Central European origin is possible but not certain. The initial enthusiasm of nineteenth-century Hungarian scholars for the supposedly Early Hungarian script was soon followed by disappointment, and late nineteenth-century scholarship came to the conclusion that the codex was a forgery. This conclusion, however, seems fairly implausible today in light of historical evidence. If the text of the Rohonc codex is not a hoax, it must be a consciously encoded or enciphered text. In theory, it may be (1) a cipher, (2) a shorthand system, or (3) an artificial language, and these possibilities are systematically assessed in the article with the help of historical analogies.
Johannes Trithemius was an abbot from the Benedictine monastery of Sponheim, and later the monastery of Würzburg. During his studies in Heidelberg, he was involved in learned humanistic societies, and later he applied the ideal of humanistic eloquence in his works. Trithemius built large libraries and wrote a number of mystical, monastic, historic, and biographic writings. He became famous especially due to his book Steganographia which dealt with cryptography on the basis of natural magic and astrology working with angelic mediations. Though Steganographia remained in manuscript form, it influenced occult sciences in the sixteenth century and cryptography. Trithemius was also accused of necromancy and demonic magic.
This paper presents a new efficient protocol for k-out-of-n oblivious transfer which is a generalization of Parakh's 1-out-of-2 oblivious transfer protocol based on Diffie-Hellman key exchange. In the proposed protocol, the parties involved generate ...
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