After we use a code to transmit our messages, we have to decode the vector which is received at the other end. The most intuitive way is roughly just to see which codeword is closest to the received vector. As long as your channel has more ...

The formal definition of a code is this: a code of length n is a subset of all possible strings, or vectors, of n symbols (chosen from some alphabet, which will often be {0,1}), which has the property that every two members of the subset (i.e., codewords) ...

The WiFi security protocol WEP should not be relied on to protect sensitive material, according to three German security researchers who have discovered a faster way to crack it. They plan to demonstrate their findings at a security conference in Hamburg this weekend. Mathematicians showed as long ago as 2001 that the RC4 key ...