2023-08-23 17:09:04 +00:00
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<title>haunt98 posts</title>
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<h2>
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<a href="index.html"><code>~</code></a>
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</h2>
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<h1>
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<a
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id="user-content-real-world-crypto-101"
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class="anchor"
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aria-hidden="true"
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2023-08-30 03:28:39 +00:00
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tabindex="-1"
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2023-08-23 17:09:04 +00:00
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href="#real-world-crypto-101"
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><span aria-hidden="true" class="octicon octicon-link"></span></a
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>Real World Crypto 101
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</h1>
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<p>
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My notes when reading
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<a
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href="https://www.manning.com/books/real-world-cryptography"
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rel="nofollow"
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>Real-World Cryptography</a
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>
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</p>
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<p><strong>Hash</strong> function convert from input to digest:</p>
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<ul>
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<li>Pre-image resistance: Given digest, can not find input</li>
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<li>
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Second pre-image resistance: Given input, digest, can not find another
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input produce same digest. Small change to input make digest big change.
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</li>
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<li>Collision resistance: Can not find 2 input produce same digest.</li>
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</ul>
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<p>
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<strong>MAC</strong> aka Message Authentication Code produce from key,
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2023-08-24 04:44:53 +00:00
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message to authentication tag. <strong>HMAC</strong> is MAC using hash.
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2023-08-23 17:09:04 +00:00
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</p>
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2023-08-24 04:44:53 +00:00
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<ul>
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<li>A send B message with MAC (generate from message and A key).</li>
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<li>
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B double check message with MAC (generate from receive message and B
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key).
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</li>
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<li>A and B use same key.</li>
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</ul>
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2023-08-23 17:09:04 +00:00
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<div>
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Feel free to ask me via
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<a href="mailto:hauvipapro+posts@gmail.com">email</a> or
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<a rel="me" href="https://hachyderm.io/@haunguyen">Mastodon</a>.
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<br />Source code is available on
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<a href="https://github.com/haunt98/posts-go">GitHub</a>
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<a href="https://codeberg.org/yoshie/posts-go">Codeberg</a>
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<a href="https://git.sr.ht/~youngyoshie/posts-go">sourcehut</a>
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<a href="https://gitea.treehouse.systems/yoshie/posts-go">Treehouse</a>
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<a href="https://gitlab.com/youngyoshie/posts-go">GitLab</a>
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</div>
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