<div dir="ltr"><div class="gmail_default" style="font-size:small">On Thu, Mar 16, 2017 at 11:17 PM, Peter Gutmann <span dir="ltr"><<a href="mailto:pgut001@cs.auckland.ac.nz" target="_blank">pgut001@cs.auckland.ac.nz</a>></span> wrote:<br></div><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="gmail-">Christian Huitema <<a href="mailto:huitema@huitema.net">huitema@huitema.net</a>> writes:<br>
<br>
>How about designing a cipher-mode that combines the robustness of CBC with<br>
>the safety of AEAD?<br>
<br>
</span>There's a whole pile of them, my favourite being OCB, but they're pretty much<br>
all patented.<br>
<span class="gmail-HOEnZb"><font color="#888888"><br></font></span></blockquote><div><br></div><div class="gmail_default" style="font-size:12.8px">OCB is patented but:</div><div class="gmail_default" style="font-size:12.8px"><br></div><div class="gmail_default" style="font-size:12.8px"><table class="gmail-m_-8397384612379276512gmail-patent-bibdata" style="border:1px solid rgb(204,204,204);margin:0px 0px 13px 19.2656px;background-color:rgb(245,245,245);font-stretch:normal;font-size:13px;line-height:normal;width:450px;padding:10px"><tbody><tr><td class="gmail-m_-8397384612379276512gmail-patent-bibdata-heading" style="font-weight:bolder;vertical-align:top;width:150px">Filing date</td><td class="gmail-m_-8397384612379276512gmail-single-patent-bibdata" style="max-width:200px">Jul 30, 2001</td></tr><tr><td class="gmail-m_-8397384612379276512gmail-patent-bibdata-heading" style="font-weight:bolder;vertical-align:top;width:150px">Priority date<span class="gmail-m_-8397384612379276512gmail-patent-tooltip-anchor gmail-m_-8397384612379276512gmail-patent-question-icon" style="display:inline-block;background-position:initial;background-size:initial;background-repeat:no-repeat;background-origin:initial;background-clip:initial;background-color:initial;height:16px;width:16px"></span></td><td class="gmail-m_-8397384612379276512gmail-single-patent-bibdata" style="max-width:200px">Oct 12, 2000</td></tr><tr><td class="gmail-m_-8397384612379276512gmail-patent-bibdata-heading" style="font-weight:bolder;vertical-align:top;width:150px">Fee status<span class="gmail-m_-8397384612379276512gmail-patent-tooltip-anchor gmail-m_-8397384612379276512gmail-patent-question-icon" style="display:inline-block;background-position:initial;background-size:initial;background-repeat:no-repeat;background-origin:initial;background-clip:initial;background-color:initial;height:16px;width:16px"></span></td><td class="gmail-m_-8397384612379276512gmail-single-patent-bibdata" style="max-width:200px">Lapsed</td></tr></tbody></table></div><div class="gmail_extra" style="font-size:12.8px"><div class="gmail_default" style="font-size:small">​I will add it to my list that I am working on:​</div></div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px"><a href="http://www.defaultdenysecurity.com/Professional/Patents/" target="_blank">http://www.<wbr>defaultdenysecurity.com/<wbr>Professional/Patents/</a><br></div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px"><div class="gmail_default" style="font-size:small">​We could contact Phil and put him on notice. Though I rather doubt he could explain not paying the patent fee for 5 years.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">As always, I am not a lawyer, get your own legal advice, etc.</div><div class="gmail_default" style="font-size:small"><br></div></div><div>The fee was paid on 8,321,675. So the situation is a little complex. But all these should expire in Oct 2020.​ </div></div></div></div>