<li>Fully encrypted and authenticated transport</li>
<li>End-to-end encrypted and authenticated private messages</li>
<li>Encrypted and authenticated channel and group messages</li>
- <li>Secure video and audio conferencing, image and sound messagse</li>
- <li>Authenticated Diffie-Hellman key exchange and Perfect Forward Secrecy</li>
+ <li>Secure video and audio conferencing, image and sound messages</li>
+ <li>Mutually authenticated Diffie-Hellman key exchange and Perfect Forward Secrecy</li>
<li>Off-the-record or On-the-record conversations with or without digital signatures</li>
<li>Secure file transfer</li>
<li>And every other feature you can expect from a modern conferencing and chat protocol...</li>