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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
  • Como funcionam o algoritmos de hash da família SHA?
    Por exemplo o SHA-256 processa, assim como no SHA-1, mensagens de valor máximo equivalente a 264 bits e também faz uso de palavras com 32 bits A construção dos algoritmos de SHA-2 é muito semelhante à construção do algoritmo de SHA-1
  • 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
  • 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。
  • 先对密码应用sha256，再用于aes256加密是否安全？ - 知乎
    TIPS: 现代 GPU 的哈希性能已经非常强了, 单片 6800XT 显卡计算 SHA-256 能做到每秒 88 亿次的生成速度, 甚至有些专用设备能做到更高个数量级的速度 (比特币矿机那类), 为了避免被离线爆破攻击, PBKDF2 在一些敏感场景已经是不建议使用了
  • 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
  • hash - How to unhash sha256? Alternatives to brute force . . .
    The generic cost of collision attack on SHA-256 is already $2^ {128}$ thanks to the birthday paradox (attack) As time has shown, MD5 and SHA-1 are no more collision-resistant but they still have their pre-image resistances
  • 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





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