what is MD5 checksum

o_o

It is a checksum which was generated with the MD5-method.
Windows uses CRC, Linux and BSDs (and Mac AFAIK) use MD5.

By getting the MD5 checksum from a program/package/whatever, you can compare it to the checksum of the original, i.e. you downloaded something from a website, and next to it was the checksum. If it is the same, then your download was successful, if not then you need to download it again, since it got damaged during transport.

Ever got the message that the CRC check failed after trying to start a corrupted downloaded exe-file?

Windows uses CRC, Linux and BSDs (and Mac AFAIK) use MD5.

what.

Ever got the message that the CRC check failed after trying to start a corrupted downloaded exe-file?

Not since I started using TCP, no.

>>3
Not since I started using TCP, no.

Personal Firewalls (liek Zone Alarm) can change those files, too. That was a bug in it some time ago

>>4 "those files too"?

You have no idea what TCP is do you?

>>2
whinedows can use md5 too

>>5
It's the opposite of UDP. In long it's the Transmission Control Protocol which is a method to send the packets to another host and does the check if the packets have arrived correctly and completely. It works in the OSI-layer 4 while IP works on layer 3.

Unfortunately teh firewall is behind the NIC and can still fuck things up.
Try again.

>>2
Fail for "Windows uses CRC, Linux and BSDs (and Mac AFAIK) use MD5." statement.

>>4
Fail for not getting joke in >>3

>>8
Ruining a joke by taking it seriously is a form of joke-counter.

MD5 is the hash function which is difficult to invert!  So the checksum is announced in public place.  You acquire the data and compute MD5 by yourself.  If you get wrong answer, there is hacker in your datas so be ware!!!

SHA or GTFO.

>>10
There is hacker in my datas :O?

>>12
Either that or what >>2 said.

Hackers? In MY datas?

>>14
It's more likely than you think!