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    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
  • 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
  • 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
  • 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
  • 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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