diff --git a/presentations/11a_Certificates_PKI.ppt b/presentations/11a_Certificates_PKI.ppt
index 906dd57f287163ab40982b10118fac51b44df42a..acda4d8eb579ea6b9250c57337d92b3b16f8a3ad 100644
Binary files a/presentations/11a_Certificates_PKI.ppt and b/presentations/11a_Certificates_PKI.ppt differ