The principle and advantages and disadvantages of the feature code method of computer virus detection?

The principle of the feature code method is to extract the feature code of the known virus samples, in the file to be detected to find the feature code of this virus, because the feature code and the virus one-to-one correspondence, so once found with the virus corresponding to the feature code can be determined to be infected with this virus.

Advantages: The feature code method has the advantage of accurate detection and low false alarm rate, because it can accurately detect which virus is specific, so it can generally carry out the corresponding removal of viruses, virus removal effect is better.

Disadvantages:

1) Cannot detect new viruses.

2) The feature code base must be updated in a timely manner.

3) Detection is slow and takes a long time.

4) Cannot detect viruses without feature codes.