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- 知乎 - 有问题，就会有答案
知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、影视
- What is the difference between SHA-3 and SHA-256?
I am new about cryptography, I learned that SHA-3 (Secure Hash Algorithm 3) is the latest member of the Secure Hash Algorithm family of standards, released by NIST But I recently saw SHA-256 but
- Is SHA-256 irreversible for each input? - Cryptography Stack Exchange
Question 1: Does SHA-256 send more than one input to each of its outputs (the bit sequences to which it maps at least one input)? That's most probably true An heuristic argument can be made similarly to the bonus question in the last section of this answer If so, have mathematicians shown this thoroughly? No, that's not mathematically proven
- Como decriptografar email criptografado em SHA-256?
SHA-256 é uma função hash e como tal ela é "one way", após a conversão não há volta, não existe processo de "descriptografar" Se por algum motivo você quer encriptar os emails no banco (isso é algo bem incomum em, veja se é realmente necessário) deve procurar alguma função de encriptação "two way" que permita reversão
- Do identical strings always have the same SHA-256 value?
If you hash a string using SHA-256 on your computer, and I hash the same string using SHA-256 on my computer, will we generate the same value? Does the algorithm depend on a seed (so we'd both need
- When using AES-256 in combination with HMAC-SHA, should we use SHA-256 . . .
2 When using AES-256 (cipher mode CBC and padding mode PKCS7) in combination with HMAC-SHA for authenticated encryption (assuming alternatives like TLS and AES-GCM cannot be used), should we use SHA-256 or SHA-512? This answer seems to indicate SHA512 Is this interpretation correct? I've seen an implementation using SHA256 and cannot figure
- Is sha-256 better then sha-1 in aspects othen then the hash size?
Assume I create a hash using SHA-256 and then take only the first 160 bits of the hash, as the result is the result more cryptographically secured than SHA-1? Or are the two algorithms equally sec
- 文件校验中md5 sha-1 sha-256 sha-512 哪种校验方式比较快呢？
首先Duplicate Cleaner 这个软件确实好用，我也经常用它去重、精简数据。 简单判断MD5、SHA-1、SHA-256 、SHA-512这几种校验算法，第一反应当然是校验值越长的越慢。
- SHA-512 faster than SHA-256? - Cryptography Stack Exchange
SHA-512 has 25% more rounds than SHA-256 On a 64-bit processor each round takes the same amount of operations, yet can process double the data per round, because the instructions process 64-bit words instead of 32-bit words Therefore, 2 1 25 = 1 6, which is how much faster SHA-512 can be under optimal conditions Of course there is memory overhead, instruction latency, and other factors
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