CHECKSUM EXAMPLE FREE

TCP and UDP checksum calculation is not much worried about collision as such(compared to md5 and sha1 algorithms). If both the values match, then the user is allowed to login. When a user enters a password, the login program generates the hash value of the password, and it compares it with the one in the database. This is the reason most of the times passwords are stored in databases in the form of hash values. You cant get the data if you have the hash value. Also the beauty of hash function is that its one way hash. This is the reason its used for file integrity verification. Its designed to be really strong, and does not have any sort of collision.

CHECKSUM EXAMPLE FREE

MD5 and SHA1 concentrates more making collision free outputs. Because it should be unique for a particular data. If there is two different set of data with same hash output, then that beats the purpose. It's nothing but the surety about the fact that 'No two hash outputs will have the same value'. Because the need is different in each case.Ĭollision is the most important factor in hash algorithms. The method used by internet communication and hash algorithms are similar, but not exactly same. The TCP and UDP data verification) does not leverage MD5 or SHA1. However Internet communication(the core network data verification. MD5 and SHA1 are primarily used to verify integrity of files. This is because you can calculate the hash value on the file that you downloaded, and then if it matches the one that is mentioned in the website, you can have the surety that the file is not corrupted/and is unaltered. You might have noticed websites that provides MD5 & SHA1 hash values of the file that you want to download. Some of the popular hash algorithms are MD5, SHA1 etc. Thanks to cryptographers who designed hash algorithms.

If both the values(of the sender and the receiver) tallies, then the data is uncorrupted/unaltered. Once the data is received, the receiver also calculates the checksum. The value calculated is either sent along with the message, or through other methods. Generally what happens is this.The sender calculates a short checksum value(very small in size) which represents the message/data that is being sent. Whatever may be the case, there needs to be a method where the receiver can verify and figure out easily if the data is altered or corrupted. When you send and receive data over the wire, there are possibilities where the data can get corrupted, altered, or modified(it can be accidental, purposely done with evil intention).

Checksum example