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By Root 16978 0

think, crown you the king of "secret-readers." But notwithstanding this, I think your opinion that the construction of a real cryptograph is impossible, not sufficiently supported. Those examples which you have published have indeed not been of that character, as you have fully proved. They have, moreover, not been sufficiently accurate, for where the key was a phrase, (and consequently the same character was employed for several letters,) different words would be formed with the same ciphers. The sense could then only be ascertained from the context, and this would amount to a probability — generally of a high degree, I admit — but still not to a positive certainty. Nay, a case might readily be imagined, where the most important word of the communication, and one on which the sense of the whole depended, should have so equivocal a nature, that the person for whose benefit it was intended, would be unable, even with the aid of his key, to discover which of two very different interpretations should be the correct one. If necessary, this can easily be shown; thus, for example, suppose a lady should receive from her affianced, a letter written in ciphers, containing this sentence, "4 5663 967 268 26 3633," and that a and n were represented by the figure 2, — e, m, and r by 3, — i by 4, — l by 5, — o, s, and v by 6, — u by 7, — w by 8, — and y by 9; a moment's inspection will show that the sentence might either be "I love you now as ever," or "I love you now no more." How "positively shocking," to say the least of it; and yet several of the ciphers that you have published have required a greater number of letters to be represented by one character, than any to be found in the example before us. It is evident, then, that this is not a very desirable system, as it would scarcely be more useful than a lock without its key, or with one that did not fit its wards.

I think, however, that there are various methods by which a hieroglyphic might be formed, whose meaning would be perfectly "hidden; " and I shall give one or two examples of what I consider such. A method which I have adopted for my own private use, is one which I am satisfied is of this nature, as it cannot possibly be solved without the assistance of its key, and that key, by which alone it can be unlocked, exists only in my mind; at the same time it is so simple, that with the practice in it which I have had, I now read it, and write it, with as much facility as I can the English character. As I prefer not giving it here, I shall be compelled to have recourse to some other plan that is more complicated. By a CRYPTOGRAPH, I understand — a communication which, though clearly ascertained by means of its proper key, cannot possibly be without it. To most persons, who have not thought much upon the subject, an article written in simple cipher, (by which I mean with each letter uniformly represented by a single distinct character,) would appear to be an impenetrable mystery; and they would doubtless imagine that the more complicated the method of constructing such a cipher, the more insoluble — to use a chemical expression — would be the puzzle, since so much less would be the chance of discovering its key. This very natural conclusion is, however, erroneous, as it is founded on the supposition that possession must first be obtained of the key, in order to unravel the difficulty, — which is not the case. The process of reasoning employed in resolving " secret writing " has not the slightest relation to the form or description of the characters used, but refers simply to their succession, and to a comparison of words in which the same letters occur. By these means any cipher of this nature can be unriddled as experience has fully shown. A very successful method of avoiding detection, would be to apply the simple cipher to words written backwards and continuously. This, I conceive, might be called a perfect cryptograph, since from the want of spaces, and consequently the impossibility of comparing words, it would utterly perplex the person attempting to discover its hidden