Radiant

SHA-512/256 is roughly 50% faster than SHA-256 on 64-bit machines, even if its digest is longer The speed-up is due to the internal computation being performed with 64-bit words, whereas the other two hash functions employ 32-bit words<img src="https://academy-public.coinmarketcap.com/srd-optimized-uploads/d38294097502407bb819d354e59670c4.png" />Conclusion of paper From our performance analysis, and experimentation on 64 bit Intel Architecture, we have shown that the cost of implementing a SHA-512 algorithm delivers a 50% performance improvement over similar implementations of SHA-256. We also showed that the storage costs for implementing SHA-512 can be reduced by adding a small amount of one-off computation to compute the SHA-512 constants - which we believe will be useful for constrained implementation environment. In order for users to be able to distinguish between a SHA-512 digest which has been truncated and a SHA512/256 digest, we also offer new initialization constants, analogous to those used in SHA-384.We also follow the standard truncation method in the SHA standard [2] which can be extended to truncations to other lengths by choosing the next set of 8 primes. When the NSA designed the SHA family of algorithms their design rationale was never published (this is one of the two major motivations for the SHA-3 competition; the other one being Wang’s attack on SHA-1). To the best of our knowledge, from observing the SHA standard, and in particular, the method used for defining SHA-384, the actual values of the initialization constants are immaterial. They only need to be unique per hash function, and this is what we used for our SHA-512/256 truncation. So, in addition, we propose an alternative method to define SHA-512/t, a truncation of SHA-512 to t bits long digests (for any positive t not equal to 256 or 384). This construction is very similar to the mechanism used in the Skein proposal for SHA-3 [4]. In either case, given SHA-512’s performance on 64 bit architectures, we believe that SHA-512/256 removes a performance obstacle for the adoption of wider hash values, and that a truncated version of SHA-512 to 256 bits is a viable alternative to SHA-256, for 64 bit architectures.Source: <a href="https://eprint.iacr.org/2010/548.pdf" rel="noopener noreferrer nofollow">https://eprint.iacr.org/2010/548.pdf</a>

Why Radiant use SHA512/256?

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