https://linzeyan.github.io/categories/hash/Recent content in Hash on RickyHugo -- gohugo.ioenMon, 18 Oct 2021 14:24:01 +0800https://linzeyan.github.io/posts/2021/20211018-what-are-encoding-encrypt-and-hashing/Mon, 18 Oct 2021 14:24:01 +0800https://linzeyan.github.io/posts/2021/20211018-what-are-encoding-encrypt-and-hashing/<ul> <li><a href="https://medium.com/starbugs/what-are-encoding-encrypt-and-hashing-4b03d40e7b0c" target="_blank" rel="noopener">Understand the crypto trio: Encode, Encrypt, and Hash</a></li> </ul> <h3 id="encoding">Encoding</h3> <blockquote> <p>It does not change the data and has no encryption effect. It simply represents the data in another form. A classic example is <code>Morse code</code>.</p> <ul> <li>JavaScript has two useful functions: <code>encodeURI</code> and <code>decodeURI</code>, which encode special characters in URLs (spaces, punctuation, etc.) into URL-safe formats.</li> <li><code>Base64</code> encodes binary data into ASCII characters.</li> <li><code>Huffman Coding</code> is a lossless compression encoding algorithm. In short, it compresses by abbreviating frequently used symbols.</li> </ul></blockquote> <h3 id="encryption">Encryption</h3> <blockquote> <p>Encryption and decryption require a key. In the simplest Caesar cipher, each letter is shifted by an offset, and that offset is the key for encryption/decryption.</p>