How to check md5 hash through Total Commander + MD5 File Checker instructions
MD5 (English Message Digest 5) is a 128-bit hashing algorithm developed by 1991 from Professor Ronald L. Rivest of Massachusetts Institute of Technology (Massachusetts Institute of Technology, MIT). It is intended for creating “prints” or digests of a message of arbitrary length and subsequent verification of their authenticity.
The MD5 algorithm is vulnerable to some attacks, for example, it is possible to create two messages with the same hash sum, so its use is not recommended. An alternative are algorithms of the SHA-2 family.
MD5 algorithm operation scheme
The input of the algorithm receives the input data stream, the hash of which must be found. Message length can be any (including zero). Write the length of the message in L. This number is integer and non-negative. The multiplicity of any numbers is optional. After the data is received, the process of preparing the stream for calculations is in progress.
Comparison of MD5 and MD4
The MD5 algorithm comes from MD4. One more round was added to the new algorithm, now there are 4 of them instead of 3 in MD4. We added a new constant in order to minimize the influence of the input message, in each round at each step and each time the constant is different, it is summed with the result F and the data block. The function G = XZ v (Y not (Z)) has changed instead of (XY v XZ v YZ). The result of each step is added to the result of the previous step, because of this a faster change in the result occurs. Changed the order of work with input words in rounds 2 and 3.
The hash contains 128 bits (16 bytes) and is usually represented as a sequence of 32 hexadecimal digits.
Some examples of hash:
MD5("md5") = 1bc29b36f623ba82aaf6724fd3b16718
Even a small change in the input message (in our case one bit: the ASCII character "5" with the code 0x35 16 = 00011010 1 2 is replaced with the character "4" with the code 0x34 16 = 00011010 0 2 ) leads to a complete change of the hash. This property of the algorithm is called the avalanche effect.
MD5("md4") = c93d3bf7a7c4afe94b64e30c2ce39f4f
An example MD5 hash for the “zero” line:
MD5("") = d41d8cd98f00b204e9800998ecf8427e
How to check md5 Total Commander
We often download various programs on the network, iso disk images, etc. And when we have already downloaded everything, unpacked it and installed it, we notice that something is wrong. But the thing was that during the download some file lost one byte or more. But the program will no longer work correctly. And to avoid this, immediately after downloading, we check the checksum (usually it is shown by those who upload the file to the network). If it is different, then the archive downloaded is broken.
She has applied the hash of md5 is quite wide, and here we will not breed bla-bla on this topic, because we just want to know How to check md5 - the checksum and compare it.
If there is no possibility to use the utility, I think the total commander is at all.
Select the required file for checking, then go to File -> Calculate CRC sums (format SFV, MD5) ...
Pop up this window, put a tick MD5, ok
Next to the file, one more file will be created, with the same name and extension md5.
Select it and open it with the F3 key, see the checksum. This is how you can check md5 with Total Commander.
Brief instructions for working with the program MD5 File Checker
In order to make sure that the downloaded file is identical to the file on the server, it is necessary to compare their checksums. For this purpose, you can use the md5 checksum algorithm.
When you add a cartoon to the server, this very checksum is calculated for it, you can see it on the information page about the cartoon.
To calculate this checksum already for the downloaded file on your computer, use the special program MD5 File Checker .
The program does not require installation. For users of the operating systems Linux, Unix, MacOS and others - you can watch similar programs as part of your OS.
Run the program. On the page with any cartoon in the block of information about the cartoon, we find the field with the checksum md5 and copy it to the clipboard.
- Paste in the field to check the number 2.
- Select the file that we want to check in the field №1.
- Click the "Check" button.
- The result is a message with the result of the program.
For example, "MD5 file sum matches checksum - everything is OK here.
The file is not corrupted or the MD5 file sum does not match the checksum. The file may be damaged. "Draw conclusions.
An additional feature of the program is the calculation of the checksum md5 for an arbitrary file and its output to the user.