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Lesson 10 of 62By Baivab Kumar Jena































































Among the many advancements seen in network security, encryption and hashing have been the core principles of additional security modules. The secure hash algorithm with a digest size of 256 bits, or the SHA 256 algorithm, is one of the most widely used hash algorithms. While there are other variants, SHA 256 has been at the forefront of real-world applications.
To understand the working of the SHA 256 algorithm and delve deeper into the realm of cybersecurity you need first to understand hashing and its functional characteristics.

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Hashing is the process of scrambling raw information to the extent that it cannot reproduce it back to its original form. It takes a piece of information and passes it through a function that performs mathematical operations on the plaintext. This function is called the hash function, and the output is called the hash value/digest. 
hashing1
As seen from the above image, the hash function is responsible for converting the plaintext to its respective hash digest. They are designed to be irreversible, which means your digest should not provide you with the original plaintext by any means necessary. Hash functions also provide the same output value if the input remains unchanged, irrespective of the number of iterations.
There are two primary applications of hashing:

passwords.


integrity1.
Now that you understand the working of hash functions, look at the key topic in hand - SHA 256 algorithm.

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SHA 256 is a part of the SHA 2 family of algorithms, where SHA stands for Secure Hash Algorithm. Published in 2001, it was a joint effort between the NSA and NIST to introduce a successor to the SHA 1 family, which was slowly losing strength against brute force attacks.
The significance of the 256 in the name stands for the final hash digest value, i.e. irrespective of the size of plaintext/cleartext, the hash value will always be 256 bits.
The other algorithms in the SHA family are more or less similar to SHA 256. Now, look into knowing a little more about their guidelines.

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sha_chars.
Some of the standout features of the SHA algorithm are as follows:

Now that you got a fair idea about the technical requirements for SHA, you can get into its complete procedure, in the next section.
You can divide the complete process into five different segments, as mentioned below:
It adds some extra bits to the message, such that the length is exactly 64 bits short of a multiple of 512. During the addition, the first bit should be one, and the rest of it should be filled with zeroes.
sha1step

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You can add 64 bits of data now to make the final plaintext a multiple of 512. You can calculate these 64 bits of characters by applying the modulus to your original cleartext without the padding.
sha2step
You need to initialize the default values for eight buffers to be used in the rounds as follows:
shabuffer-SHA_256_Algorithm.
You also need to store 64 different keys in an array, ranging from K[0] to K[63]. They are initialized as follows: 
keybits-SHA_256_Algorithm.
Courtesy: SHA-2 (Wikipedia)

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The entire message gets broken down into multiple blocks of 512 bits each. It puts each block through 64 rounds of operation, with the output of each block serving as the input for the following block. The entire process is as follows:
functionsha-SHA_256_Algorithm
Courtesy: Medium Article on SHA 256
While the value of K[i] in all those rounds is pre-initialized, W[i] is another input that is calculated individually for each block, depending on the number of iterations being processed at the moment.
With each iteration, the final output of the block serves as the input for the next block. The entire cycle keeps repeating until you reach the last 512-bit block, and you then consider its output the final hash digest. This digest will be of the length 256-bit, as per the name of this algorithm.
With the SHA 256 algorithm being implemented thoroughly since the early 90s, there are specific applications that you can look into. You will see them in the next section.
apps_Sha.
As seen in the image above, the SHA algorithm is being used in a lot of places, some of which are as follows:





With hashing and encryption being a staple in today’s digital workspace, it’s no surprise that the demand for cybersecurity professionals has shot through the roof. Apart from cryptography, multiple other avenues in this field are necessary if one wants to pursue a career as a security analyst or network administrator.
Simplilearn offers a "Cybersecurity Expert" course that both newcomers and seasoned corporate professionals can easily pick up. From covering the basics of cybersecurity to teaching its most nuanced characteristics, the course is filled with tasks, live classes, and a solid foundation to start your career in this lucrative field.
In today’s lesson on SHA 256 algorithm, you learned the basics of hashing, the applications of hashing, the origin of SHA, its working, and the places this algorithm finds use. Hopefully, this has been an exciting session for you. 
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Do you have any questions regarding any part of this tutorial? Please let us know your thoughts and questions in the comment section below, and we will have our experts look at it for you.
Baivab Kumar Jena is a computer science engineering graduate, he is well versed in multiple coding languages such as C/C++, Java, and Python.
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