diff --git a/presentations/11a_Certificates_PKI.ppt b/presentations/11a_Certificates_PKI.ppt
index 44d6b57cfc349ddc8938148eaf0641bf18484991..02458e43ced3b83bc9f192cac55ffd878acfe95e 100644
Binary files a/presentations/11a_Certificates_PKI.ppt and b/presentations/11a_Certificates_PKI.ppt differ