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I know it is used for digitally signing any data or message. It can be used for sending any message securely, but where is it applied in industries? Can anyone tell the practical applications of $\text{SHA-3}$ in brief?

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closed as too broad by yyyyyyy, otus, SEJPM, Maarten Bodewes, CodesInChaos Mar 30 at 20:12

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

    
SHA-3 is a family of hash algorithms, enacted in August 2015, which is recent. Therefore there are few actual uses, if any. Are you asking how members of the SHA-3 family could be used ? – fgrieu Mar 30 at 9:38

Your question is far too broad and probably a duplicate. Hence I'll provide you a quick (& dirty) and completely incomplete answer but it will give you a general idea.

$\text{SHA-3}$ is a hash function. It is the NIST name for the Keccak algorithm. Hence its usage is the same as the one of hash functions.

It is also possible to use it as XOF (eXtended Output Function) : $\text{SHAKE256}$, therefore as a stream cipher.


I know its used for digitally signing any data or message.

Wrong. You do not sign anything with a hash function. For this you need a signature scheme. It implies non-repudiation which cannot be provided with hash functions. However hash functions can be used to verify integrity via a $\text{MAC}$.

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Then again, you could use a simplified scheme for a MAC instead of HMAC when using SHA-3 because it is not vulnerable against lenght extension attacks. – Maarten Bodewes Mar 30 at 13:29
    
I know its for digitally signing but which all companies are using it and where??? – june Apr 7 at 6:33

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