public String getCak() {
        return this.cak;
    }
<p>
The MAC Security (MACsec) CAK to associate with the dedicated connection.
</p>
<p>
You can create the CKN/CAK pair using an industry standard tool.
</p>
<p>
The valid values are 64 hexadecimal characters (0-9, A-E).
</p>
<p>
If you use this request parameter, you must use the <code>ckn</code> request parameter and not use the
<code>secretARN</code> request parameter.
</p>

@return The MAC Security (MACsec) CAK to associate with the dedicated connection.</p>
        <p>
        You can create the CKN/CAK pair using an industry standard tool.
        </p>
        <p>
        The valid values are 64 hexadecimal characters (0-9, A-E).
        </p>
        <p>
        If you use this request parameter, you must use the <code>ckn</code> request parameter and not use the
        <code>secretARN</code> request parameter.
aws-java-sdk-directconnect/src/main/java/com/amazonaws/services/directconnect/model/AssociateMacSecKeyRequest.java