diff --git a/presentations/11a_Certificates_PKI.ppt b/presentations/11a_Certificates_PKI.ppt
index 02458e43ced3b83bc9f192cac55ffd878acfe95e..906dd57f287163ab40982b10118fac51b44df42a 100644
Binary files a/presentations/11a_Certificates_PKI.ppt and b/presentations/11a_Certificates_PKI.ppt differ