transposition.rar - In cryptography, a transposition cipher is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext constitutes a permutation of the plaintext. That is, the order of the units is changed. Mathematically a bijective function is used on the characters positions to encrypt and an inverse function to decrypt.,2015-10-07 14:16:34,下载2次
RC4-Prog.rar - In cryptography, RC4 (Rivest Cipher 4 also known as ARC4 or ARCFOUR meaning Alleged RC4, see below) is a stream cipher. ,2015-10-07 14:04:35,下载1次
diffeehellmanPROGRAM.rar - Example 1. To find 1537 x 4248 modulo 10, you could multiply out and take the last digit, but a better way would be to replace 1537 by 7 and 4248 by 8 to start, find 7 x 8 = 56, and then take 56 mod 10 to get 6 as the answer.
A handy standard notation is to write a tex2html_wrap_inline39 b (mod m) if a and b have the same remainder modulo m. This is read a is congruent to b modulo m . In this notation the example just mentioned looks like this: 1537 x 4248 tex2html_wrap_inline39 7 x 8 = 56 tex2html_wrap_inline39 6 (mod 10).,2015-10-07 13:59:39,下载1次
DES-Program.rar - DES was once a predominant symmetric-key algorithm for the encryption of electronic data. It was highly influential in the advancement of modern cryptography in the academic world.,2015-10-07 13:54:29,下载1次
There-are-three-types-of-cryptography-techniques. - Caesar cipher is a simple substitution cipher where each letter in the plain text is replaced with a letter a fixed number of places down the aplhabet.
EXAMPLE
If the number of places to shift is 3, the letter A would be converted to ltter D. Using the same number of shifts the letter x wud be replaced with letter a. if we change the number of shift to 2 A wud be C and X wud be Z.
Using the shift of 3 for the plin text below
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.
Will result in the following cipher text
WKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ.,2015-10-07 13:44:04,下载2次