<div class="content"><p> The <b>Encrypted FEK</b> field in the <a href="230807ac-20be-494f-86e3-4c8ac23ea584#gt_1c30c0a6-5251-40d5-9641-748df0618e7c" data-linktype="relative-path">DDF</a> and <a href="230807ac-20be-494f-86e3-4c8ac23ea584#gt_60e31963-34c7-4df0-a133-2ccd656bf425" data-linktype="relative-path">DRF</a> <a href="230807ac-20be-494f-86e3-4c8ac23ea584#gt_718bfd46-3cd2-45e8-befa-55f5c9f3be7b" data-linktype="relative-path">key</a> list entries MUST consist
of the following structure, encrypted as specified in the description of the <b>Flags</b>
field for the key list entry. </p><table>
 <tbody><tr>
  <th><p><br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>1<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>2<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>3<br/>0</p></th>
  <th><p><br/>1</p></th>
 </tr>
 <tr>
  <td colspan="32">
  <p>Key Length</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p>Entropy</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p>Algorithm</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p>Reserved</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p>Key
  (variable)</p>
  </td>
 </tr>
 <tr>
  <td colspan="32">
  <p>...</p>
  </td>
 </tr>
</tbody></table><p><b>Key Length (4 bytes): </b>The length, in bytes, of
the <b>Key</b> field. It MUST be a 32-bit unsigned integer in little-endian
format. Possible values depend on the algorithm ID (<a href="4cc8e6ae-99aa-483e-99c1-ab4c0ee46294" data-linktype="relative-path">ALG_ID</a>) as specified in
section 2.2.13.<a id="Appendix_A_Target_11"></a><a aria-label="Product behavior note 11" href="cecd911d-7105-45cc-a7c8-348335d6f03f#Appendix_A_11" data-linktype="relative-path">&lt;11&gt;</a></p><p><b>Entropy (4 bytes): </b>The number of bits of true
randomness in the key contained in this structure. It MUST be a 32-bit unsigned
integer in little-endian format. Possible values depend on the <b>Algorithm</b>
as specified in section 2.2.13.</p><p><b>Algorithm (4 bytes): </b>The symmetric
cryptographic algorithm associated with this key. It MUST be a 32-bit unsigned
integer in little-endian format. Possible values are specified in section
2.2.13. The possible values for this field are constrained by the value of the <a href="230807ac-20be-494f-86e3-4c8ac23ea584#gt_3bd30c20-9517-4030-a48c-380362e209a1" data-linktype="relative-path">EFS</a> version field in the <a href="625335e5-a423-4d1c-be51-c696c32aa2eb" data-linktype="relative-path">EFSRPC Metadata</a>.</p><p><b>Reserved (4 bytes): </b>MUST be set to zero and
ignored.</p><p><b>Key (variable): </b>The <a href="230807ac-20be-494f-86e3-4c8ac23ea584#gt_3a58e275-3d9f-4b66-8c8d-9808cd0cd8ff" data-linktype="relative-path">FEK</a> for the <a href="230807ac-20be-494f-86e3-4c8ac23ea584#gt_a04c146a-de3b-4e4b-829f-a9e772f3fe25" data-linktype="relative-path">file</a>.</p></div>