为什么 SHA2 有 384 位版本？
Why SHA2 has a 384 bit version?
我知道有 256 和 512 版本，因为它们都是 2 的幂。但是 384 是从哪里来的呢？
我知道 384 的二进制表示是 110000000 但我无法理解其中的逻辑。
不在256和512的中间，连对数的中间都不是。
为什么是 384？
256 + 128 = 384
只不过是上述2的幂的两个值相加！！
快速浏览维基百科发现：
SHA-256 and SHA-512 are novel hash functions computed with 32-bit and
64-bit words, respectively. They use different shift amounts and
additive constants, but their structures are otherwise virtually
identical, differing only in the number of rounds. SHA-224 and SHA-384
are simply truncated versions of the first two, computed with
different initial values.
查看 comparison between all the variants, it seems that SHA-384 is more resistant to length extension attacks 比 SHA-512（其更长的版本）。
您可以在 Cryptography Stack Exchange 上找到更详细的答案：here。
我知道有 256 和 512 版本，因为它们都是 2 的幂。但是 384 是从哪里来的呢？
我知道 384 的二进制表示是 110000000 但我无法理解其中的逻辑。
不在256和512的中间，连对数的中间都不是。
为什么是 384？
256 + 128 = 384
只不过是上述2的幂的两个值相加！！
快速浏览维基百科发现：
SHA-256 and SHA-512 are novel hash functions computed with 32-bit and 64-bit words, respectively. They use different shift amounts and additive constants, but their structures are otherwise virtually identical, differing only in the number of rounds. SHA-224 and SHA-384 are simply truncated versions of the first two, computed with different initial values.
查看 comparison between all the variants, it seems that SHA-384 is more resistant to length extension attacks 比 SHA-512（其更长的版本）。
您可以在 Cryptography Stack Exchange 上找到更详细的答案：here。