<div>How this:</div><div></div><div>Message Encryption Key = SHA(SHA(SHA(SHA(. . .SHA(PRB)))))</div><div></div><div>Could be secure?</div><div></div><div>26.11.2015, 20:48, "Tony Arcieri" <bascule@gmail.com>:</div><blockquote type="cite"><div>Wickr has released this description of their encrypted messaging protocol:<div></div><div><a href="https://www.wickr.com/wp-content/uploads/2015/11/Wickr_Whitepaper_Final.pdf">https://www.wickr.com/wp-content/uploads/2015/11/Wickr_Whitepaper_Final.pdf</a></div><div></div><div>At first glance it reminds me of this:</div><div></div><div><a href="https://whispersystems.org/blog/asynchronous-security/">https://whispersystems.org/blog/asynchronous-security/</a><br /><div></div>-- <br /><div>Tony Arcieri</div></div></div>,<p>_______________________________________________<br />Messaging mailing list<br /><a href="mailto:Messaging@moderncrypto.org">Messaging@moderncrypto.org</a><br /><a href="https://moderncrypto.org/mailman/listinfo/messaging">https://moderncrypto.org/mailman/listinfo/messaging</a></p></blockquote>