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[其他] TLS nonce-nse

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致命的是习惯 发表于 2016-10-13 02:05:14
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One of the base principles of cryptography is that you can't just encrypt multiple messages with the same key. At the very least, what will happen is that two messages that have identical plaintext will also have identical ciphertext, which is a dangerous leak. (This is similar to why you can't encrypt blocks with ECB .)
   
TLS nonce-nse-1 (dangerous,principles,different,function,computer)

  If you think about it, a pure encryption function is just like any other pure computer function: deterministic. Given the same set of inputs (key and message) it will always return the same output (the encrypted message). And we don't want an attacker to be able to tell that two encrypted messages came from the same plaintext.

TLS nonce-nse-2 (dangerous,principles,different,function,computer)

  The solution is the use of IVs (Initialization Vectors) or nonces (numbers used once). These are byte strings that are different for each encrypted message. They are the source of non-determinism that is needed to make duplicates indistinguishable. They are usually not secret, and distributed prepended to the ciphertext since they are necessary for decryption.
  The distinction between IVs and nonces is controversial and not binary. Different encryption schemes require different properties to be secure: some just need them to never repeat, in which case we commonly refer to them as nonces; some also need them to be random, or even unpredictable, in which case we commonly call them IVs.
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徐舟伺江 发表于 2016-10-13 06:38:34
夏天就是不好,穷的时候我连西北风都没得喝……
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超兽神 发表于 2016-10-18 10:19:06
任性的超兽神飞过
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林颖颖1 发表于 2016-10-21 01:50:22
每天只签到不留言的,升级永远没有见贴就留言的快。说明:”复制粘贴很重要!
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凌萱 发表于 2016-10-21 20:59:18
兄弟我先抛块砖,有玉的尽管砸过来。
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西安网 发表于 2016-10-31 05:52:02
开往春天的坦克!
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邓欢 发表于 2016-11-15 07:02:49
感觉不错!
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甩的就是男人 发表于 2016-11-15 18:55:09
为何要放弃治疗?
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