Derniers Contes

By Edgar Allan Poe

Page 102

se demander comment, sans la clef, sans connaitre une
seule lettre du chiffre, il serait possible a celui qui a intercepte la
lettre de tirer quelque chose d'un mot tel que _iiii_.

Mais voici qui est plus fort. On pourrait facilement construire une
phrase-clef, ou un seul caractere representerait six, huit ou dix
lettres. Imaginons-nous le mot _iiiiiiiiii_ se presentant dans une
cryptographie a quelqu'un qui n'a pas la clef, ou si cette supposition
est par trop scabreuse, supposons en presence de ce mot la personne
meme a qui le chiffre est adresse, et en possession de la clef. Que
fera-t-elle d'un pareil mot? Dans tous les manuels d'Algebre on trouve
la _formule_ precise pour determiner le nombre d'arrangements selon
lesquels un certain nombre de lettres _m_ et _n_ peuvent etre placees.
Mais assurement aucun de mes lecteurs ne peut ignorer quelles
innombrables combinaisons on peut faire avec ces dix _i_. Et cependant,
a moins d'un heureux accident, le correspondant qui recevra ce chiffre
devra parcourir toutes les combinaisons avant d'arriver au vrai mot,
et encore quand il les aura toutes ecrites, sera-t-il singulierement
embarrasse pour choisir le vrai mot dans le grand nombre de ceux qui se
presenteront dans le cours de son operation.

Pour obvier a cette extreme difficulte en faveur de ceux qui sont en
possession de la clef, tout en la laissant entiere pour ceux a qui le
chiffre n'est pas destine, il est necessaire que les correspondants
conviennent d'un certain _ordre_, selon lequel on devra lire les
caracteres qui representent plus d'une lettre; et celui qui ecrit la
cryptographie devra avoir cet _ordre_ present a l'esprit. On peut
convenir, par exemple, que la premiere fois que l'_i_ se presentera dans
le chiffre, il representera le caractere qui se trouve sous le premier
_i_ dans la phrase-clef, et la seconde fois, le second caractere
correspondant au second _i_ de la clef, etc., etc. Ainsi il faudra
considerer quelle place chaque caractere du chiffre occupe par rapport
au caractere lui-meme pour determiner sa signification exacte.

Nous disons qu'un tel _ordre_ convenu a l'avance est necessaire pour que
le chiffre n'offre pas de trop grandes difficultes meme a ceux qui en
possedent la clef. Mais on n'a qu'a regarder la cryptographie de notre
correspondant de Stonington pour s'apercevoir qu'il n'y a observe aucun
ordre, et que plusieurs caracteres y representent, dans la plus absolue
confusion, plusieurs autres. Si donc, au sujet du gant que nous avons
jete au publie en avril, il se sentait quelque velleite de nous accuser
de fanfaronnade, il faudra cependant bien qu'il admette que nous avons
fait honneur et au dela a notre

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Text Comparison with The Works of Edgar Allan Poe — Volume 4

Page 2
But these they do exceedingly well, and intersperse them, with singular ingenuity, wherever they find room for the chisel.
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Mr.
Page 17
" To be sure the words themselves had little or no meaning.
Page 39
Moneypenny always calls me the Queen of the Hearts)--and that Zenobia, as well as Psyche, is good Greek, and that my father was "a Greek," and that consequently I have a right to our patronymic, which is Zenobia and not by any means Snobbs.
Page 44
' You may make a good deal of that little fact if properly worked.
Page 47
Just twig that Tau! In short, there is nothing like Greek for a genuine sensation-paper.
Page 54
My sensations were those of entire happiness, for I felt.
Page 59
This gentleman, whom I shall call Hermann, was an original in every respect--except, perhaps, in the single particular that he was a very great fool.
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arisen.
Page 93
From the few words thus preserved, we glean several important items of knowledge, not the least interesting of which is the fact that a thousand years ago actual monuments had fallen into disuse--as was all very proper--the people contenting themselves, as we do now, with a mere indication of the design to erect a monument at some future time; a corner-stone being cautiously laid by itself "solitary and alone" (excuse me for quoting the great American poet Benton!), as a guarantee of the magnanimous intention.
Page 97
Had Alexander not been Alexander, he would have been Diogenes; and the Duc assured his antagonist in taking leave, "que s'il n'eut ete De L'Omelette il n'aurait point d'objection d'etre le Diable.
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We landed, in fine, more dead than alive, after four days of intense distress, upon the beach opposite Roanoke Island.
Page 133
In its original form, this law offered a premium for cat-heads (fourpence a-piece), but the Senate succeeded in amending the main clause, so as to substitute the word "tails" for "heads.
Page 140
In truth, while that merit which consists in the mere avoiding demerit, appeals directly to the understanding, and can thus be foreshadowed in Rule, the loftier merit, which.
Page 142
And such it would undoubtedly be, were they right in their supposition.
Page 148
The interior of the figure, as seen through these apertures, appears to be crowded with machinery.
Page 155
Then let the antagonist narrowly watch the Automaton, until he detect the preparatory motion in the shoulder.
Page 163
brought up close to his body and tightly compressed between his body and the side of the Automaton,) or else to use his left arm brought across his breast.
Page 165
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Page 175
There were two or three astronomers, of secondary note, who resolutely maintained that a contact was inevitable.