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Fitted better intelligence personnel, this password is not desirable for the greater mobility of military operations department. Therefore, in the military cryptography, we consider only the short key password.
I said before, the encryption transform and decryption of two mutually inverse transform transform in a few decades ago, this distinction is generally not very stressed, as long as know one of transformation, its inverse transformation is at hand. But by the 1970s, this concept was to break the Kind of transform, transform into another state - state transform its calculation is very easy; in turn, transform back to the original state from another state, that is, the inverse transformation, although in theory transform is learned, but the calculation is very complicated. That the use of modern computer also spent thousands of years, this calculation has lost any practical significance. From two large prime numbers is transformed into its plot, this transformation is a multiplication, apparently easy, but, in turn, take a large integer into two primes - like there is no efficient algorithm to calculate very difficult. Under this holding, we design a so-called In this password needs to be emphasized that the encryption in the calculation of the difficulty of the great differences between transformation and decryption, and two (group) key, and one (group) is the encryption key (to open) another (group) is the decryption key (must be kept confidential), respectively,oakley sunglasses, for the encryption and decryption.
The three elements of the code-breaking
Password deciphering approach is confrontation with the preparation method of the password. Password deciphering, in principle, follow the observation and experience, inductive and deductive methods, the steps are: analysis, hypothesis, speculation and confirm (or deny). The frequency characteristics of the language, connectivity features and redundant features, but the three elements of the code-breaking
Human language used to express the information is very different with different ethnic and regional, but all have three important characteristics of these three characteristics of the language, code-breaking for us, especially the break Ze single table instead of password, and provide very favorable conditions.
1, the frequency characteristics
Password analysts have long known that, in a variety of languages, the frequency of use of each letter (or components) is not the same, some high, some low, a phenomenon called the phenomenon of partial use.
English article, we will - the number of letters in the article referred to as the letter frequency (in this article). The article assumes that the total of the letter N, letter frequency divided by N to get this letter (in this article), frequency of use.
The highest in the widespread use of English c frequency, equivalent to 10 000 letters, with an average of 1304 times; while the widespread use of the lowest frequency z, equivalent to only an average of 8 times in the 10,000 letters, and this is the so-called partial phenomenon, usually
Put this partial use of language phenomenon called frequency characteristics.
Similarly, the ancients also French,fake oakleys, German, Italian, Spanish, Pu, Japan, Russia and other languages ​​on the frequency and frequency of use of the letters statistics, and has also been similar to the current law.
Language in addition to the common frequency of use of special