rt.r.s
The clue to this is the suppression of the vowels and the filling of their places by dots—one for i, two for a, three for e, four for o, and five for u. In the second example, the same sentence would run—Knckpkt vfrsxs Bpnkfbckk, &c., the vowel places being filled by the consonants—b, f, k, p, x. By changing every letter in the alphabet, we make a vast improvement on this last; thus, for instance, supplying the place of a with z, b with x, c with v, and so on. This is the very system employed by an advertiser in a provincial paper, which we took up the other day in the waiting-room of a station, where it had been left by a farmer. As we had some minutes to spare, before the train was due, we spent them in deciphering the following:—
Jp Sjddjzbrza rzdd ci sijmr. Bziw rzdd xrndzt, and in ten minutes we read: “If William can call or write, Mary will be glad.”
When the Chevalier de Rohan was in the Bastile his friends wanted to convey to him the intelligence that his accomplice was dead without having confessed. They did so by passing the following words into his dungeon written on a shirt: “Mg dulhxecclgu ghj yxuj; lm et ulge alj.” In vain did he puzzle over the cipher, to which he had not the clue. It was too short; for the shorter a cipher letter, the more difficult it is to make out. The light faded, and he tossed on his hard bed, sleeplessly revolving the mystic letters in his brain; but he could make nothing out of them. Day dawned, and with its first gleam he was poring over them; still in vain. He pleaded guilty, for he could not decipher “Le prisonnier est mort; il n’a rien dit.”
A curious instance of cipher occurred at the close of the sixteenth century, when the Spaniards were endeavoring to establish relations between the scattered branches of their vast monarchy, which at that period embraced a large portion of Italy, the Low Countries, the Philippines, and enormous districts in the New World. They accordingly invented a cipher, which they varied from time to time, in order to disconcert those who might attempt to pry into the mysteries of their correspondence. The cipher, composed of fifty signs, was of great value to them through all the troubles of the “Ligue,” and the wars then desolating Europe. Some of their dispatches having been intercepted, Henry IV. handed them over to a clever mathematician, Viete, with the request that he would find the clue. He did so, and was able also to follow it as it varied, and France profited for two years by his discovery. The Court of Spain, disconcerted at this, accused Viete before the Roman Court as a sorcerer and in league with the devil. This proceeding only gave rise to laughter and ridicule.
A still more remarkable instance is that of a German professor, Herman, who boasted, in 1752, that he had discovered a cryptograph absolutely incapable of being deciphered without the clue being given by him; and he defied all the savants and learned societies of Europe to discover the key. However, a French refugee, named Beguelin, managed after eight days’ study to read it. The cipher—though we have the rules upon which it is formed before us—is to us perfectly unintelligible. It is grounded on some changes of numbers and symbols; the numbers vary, being at one time multiplied, at another added, and become so complicated that the letter e, which occurs nine times in the paragraph, is represented in eight different ways; n is used eight times, and has seven various signs. Indeed, the same letter is scarcely ever represented by the same figure. But this is not all; the character which appears in the place of i takes that of n shortly after; another Symbol for n stands also for t. How any man could have solved the mystery of this cipher is astonishing.
All these cryptographs consist in the exchange of numbers of characters for the real letters; but there are other methods quite as intricate, which dispense with them.
The mysterious cards of the Count de Vergennes are an instance. De Vergennes was Minister of Foreign Affairs under Louis XVI., and he made use of cards of a peculiar nature in his relations with the diplomatic agents of France. These cards were used in letters of recommendation or passports, which were given to strangers about to enter France; they were intended to furnish information without the knowledge of the bearers. This was the system. The card given to a man contained only a few words, such as:—