title: Is this AES encrypt safe?
body: <p>Here is my question:  </p>
  
  <pre><code>two AES key: k1 and k2 use k1 to encrypt k2 generate c and k2 encrypt 
  k1 generate d, publish c and d
  </code></pre>
  
  <p>Is this safe? Can any hacker got k1 or k2 from c and d?</p>