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In this blog, we will talk about SHA1 vs. SHA2, as you might have seen them frequently used in your journey to understanding cybersecurity. SHA might remind you of the negative emotions from the World of Warcraft, the popular online game. If you are not an MMORPG gamer, you might think of SHA1 and SHA2 as hash algorithms. Though both analogies about SHA (Secure Hashing Algorithm) are correct, we will talk about the one that is based on hashing.
We want to make sure you’re at the correct place for the right kind of Hash, so we will go through what it means in cybersecurity terms.
The digital space was, is, or will never be safe as long as countless cyber criminals and hackers are lurking around and looking for ways to lure netizens and steal their data. Fortunately, users have started being on their toes and become alert of their digital footprints, taking extra care of their data security.
Thus, everyone using the Internet must consciously and consistently validate the legitimacy of each e-attribute. How, you ask? That is where Hashing comes into play!
Hashing can be defined as a mathematical algorithm that uses cryptographic techniques to change plaintext to a distinct ciphertext or text string. Let us take an example to understand hashing better.
Suppose your name is Sarah, and you are needed to enter your name into a website but don’t want anyone to know about it. With the application of hashing algorithm, your name will be converted into a distinct string of text that only you can decipher.
So Sarah will be converted to – 28e5481a80aa2bd18c8cf35d0495980a
Oftentimes, people mistake hashing for encryption. However, encryption is actually a two-way function, while hashing is just one-way. So, encryption can be reversed while hashing cannot be, which is the key difference between the two.
Let us give you an example of their applications for a better understanding.
One of its practical applications of hashing is used in the banking sector. Let’s say you have applied for a credit card and entered a password to access your account. Though you are using the bank’s server, it does not save your credentials in the system. Rather, it will run your password via a hashing function and saves the ‘hash’ as your password. So every time you log in to your account, it tallies the password you enter with the hash password it has saved in its system. When the two match, you get the authority to use your account.
Encryption is used for the encryption of the data in transit (here, your credit card password) so that no one can access it during the data communication between the two servers.
So, hashing is used for:
Now that we know what hashing is and how it differs from encryption let us understand SHA in simple terms.
SHA is an abbreviation for secure hashing algorithm. It is a cryptographic algorithm and is employed for hashing data and certificates. In SHA, every piece of information or data has a distinct hash that does not match any other data price and is practically impossible to be duplicated. Furthermore, as the Hash is dependent on the generated out Hash (from the data), the final digital signature is distinct too.
SHA has two algorithm versions, typically used by the Public Key Infrastructure Market (PKI). They are SHA-1 and SHA-2. Let us discuss them briefly.
Developed by the U.S. Government SHA-1 and SHA-2 are two cryptographic versions of the SHA and results from the same algorithm. Despite that, these two have some technical differences that we will talk about now.
SHA-1 is a cryptographic 160-bit hash function whose output is represented by a 40-digit long hexadecimal number. The algorithm is based on principles similar to the design of the MD4 and MD5 hashing algorithms that were used in the early 1990s. It generates a unique message of length <264 in blocks of 512 bits. Simply put, while computing a message digest, the algorithm processes a block of 512 bits in sequence. This hash function is also employed in distributed revision control systems like Mercurial, Monotone, and Git.
SHA-2 can be defined as cryptographic hash functions designed by the U.S. National Security Agency. While it works the same as SHA-1, it offers a higher security level. Made with the motive of eliminating the security shortcomings in the SHA-1 algorithm, it is a family of four hash functions, each having their own digest sizes: SHA-224, SHA-256, SHA-384, and SHA-512.
SHA-256 works on 32-bit where as SHA-512 works on 64-bit words, which is why both use different algorithms. However, they are widely employed for the purpose of authenticating and signing digital security certificates like SSLs, Code Signing certificates, and documents.
Out of all, the 256-bit is frequently used and seen, which is why it is often compared with SHA-1. The reason is quite simple. The 224-bit variant is not robust enough to support publicly-trusted SSL certificates, while the 512-bit variant is not compatible with a wide range of software, making SHA256 the popular SHA2 algorithm.
Although both the hash function algorithms sound similar, SHA-2 generates a longer hash. Not just that, there are more differences between the two versions. Let’s find out.
While the two algorithms belong to the SHA group of cryptographic hash functions and have found their usage in the U.S. Government SHA-2 is a safer hashing algorithm when compared to SHA-1 hashing function. When we talk about the SHA-1 algorithm, it is not considered as secure due to security vulnerabilities. Thus, all the SHA-1-based certificates and intermediates are no longer used.
SHA-1 generates a unique message of length <2^64 in blocks of 512-bit and comes up with a 160-bit message digest. By processing the blocks of 512 bits, it renders a 40-digit long hexadecimal number. It came into existence in order to solve security vulnerabilities. Meanwhile, SHA-2 processes messages in 512-bit blocks for the 224, 256, and 384 hash functions and 1,024 blocks for the SHA-512 algorithm.
Between 2011 and 2015, SHA-1 was the primarily used hashing algorithm. However, security vulnerabilities started coming up and paved the way for the SHA-2 to overcome the security issues of its predecessor, SHA-2 generates a longer hash and is thus considered secure.
Also popular as SHA1 vs SHA256, let’s finish up with a side-by-side comparison of SHA1 vs. SHA2:
|Type of Hash Function||SHA-1||SHA-2|
|Algorithm||SHA-1 is the oldest and primary hashing algorithm of the SHA family of hash functions||SHA-2 is a group of cryptographic hash functions that were developed as a substitute for the SHA-1 algorithm.|
|Relevance||SHA-1 is no longer a universally recognized hash function due to its security vulnerabilities.||SHA-2 is quite improved and is used for securing trust certificates.|
|Message Digest||SHA-1 generates a unique message of length <2^64 in blocks of 512-bit and comes up with a 160-bit message digest.||SHA-2 is a group of four hash functions, each having its own digest size: SHA-224, SHA-256, SHA-384, and SHA-512.|
|Application||This hash function is also employed in distributed revision control systems like Mercurial, Monotone, and Git.||This hash function is widely used to authenticate and sign digital security certificates like SSLs and Code Signing certificates and documents.|
We hope the side-by-side comparison of both the hash function helped you better understand the concept of SHA-1 and SHA-2.
Read also about SHA1 Vs. SHA256
Since the 1950s, hash algorithms have been in existence. However, the digital landscape has changed with the Internet becoming more and more accessible. Today, cyber-attacks have increased, and the need for hashing algorithms has also changed. The concept that was limited to user authentication and checking data integrity is now used for generating message digests and digital signatures, thereby securing the data.
We hope we have given a good insight into SHA1 vs. SHA2. So, if you are a stakeholder in this cybersecurity campaign, make sure you use these concepts to keep your user data safe and secure.