Finally, you can compare both the has files and they are same, then the downloaded file is not modified. Now after downloading the firmware, you can use the CRC SHA tool from the 7-Zip sub context menu to generate a has code for the downloaded file. Along with the firmware file, the manufacturer also provides you with a has file.

The combination of CRC and SHA can be used to check the integrity of the data that you downloaded from the internet.įor example, consider you are trying to upgrade the firmware of your router and downloaded the firmware file from the manufacturer’s website. What is CRC SHA?įrom the previous context, we understood that CRC is used for detecting errors in the information received while SHA authenticates the data with hash values. SHA in Windows system checks for the files that are downloaded from the internet for any corruption. All these hash functions are often used in information security applications such as digital signatures, message authentication codes etc. There are different types of SHA such as SHA-0, SHA-1, SHA-2 and SHA-3. SHA is a family of cryptographic hash functions that maps a data (or the message) of variable length into a message digest (or hash) of a fixed length. It was designed by the NSA and published by National Institute of Standards and Technology. It is a popular method of error detection as the algorithm for CRC can be embedded into the hardware (in the firmware to be specific) with just a few lines of code. As most of the modern communication is digital in nature i.e., sequence of 1’s and 0’s, there is a chance that a 1 is replaced by 0 and a 0 is replaced by 1.Ĭyclic Redundancy Check or CRC helps in detecting the errors in sequence of bits. It is a technique used in computer networks to detect and correct errors in digital data. CRC is short for Cyclic Redundancy Check.

7zip win 10