feat: crypto aes

docs/2023-08-23-real-world-crypto.html

@@ -141,6 +141,24 @@
     <span class="pl-ent">bob </span><span class="pl-k">--&gt;&gt;</span> <span class="pl-ent">alice</span><span class="pl-k">:</span> <span class="pl-s">return ERROR</span></pre>
     </div>
     <p><strong>HMAC</strong> is MAC using hash</p>
+    <h2 id="user-content-aes">
+      <a class="heading-link" href="#aes"
+        >AES<span aria-hidden="true" class="octicon octicon-link"></span
+      ></a>
+    </h2>
+    <p>
+      Currently (2023) the world using AES-128 which take a key 128 bits == 16
+      bytes/
+    </p>
+    <ul>
+      <li>Take a variable-length key</li>
+      <li>Take plaintext of 128 bits</li>
+      <li>Give ciphertext of 128 bits</li>
+    </ul>
+    <p>
+      AES is kind of cipher, handle fixed-size plaintext so we called
+      <strong>block cipher</strong>.
+    </p>
 
     <div>
       Feel free to ask me via

posts/2023-08-23-real-world-crypto.md

@@ -66,3 +66,14 @@ sequenceDiagram
 ```
 
 **HMAC** is MAC using hash
+
+## AES
+
+Currently (2023) the world using AES-128 which take a key 128 bits == 16 bytes/
+
+- Take a variable-length key
+- Take plaintext of 128 bits
+- Give ciphertext of 128 bits
+
+AES is kind of cipher, handle fixed-size plaintext so we called **block
+cipher**.