diff --git a/presentations/11a_Certificates_PKI.ppt b/presentations/11a_Certificates_PKI.ppt
index 0d3f49105f9d663865d2027e8aa0dcf21a9e44dd..44d6b57cfc349ddc8938148eaf0641bf18484991 100644
Binary files a/presentations/11a_Certificates_PKI.ppt and b/presentations/11a_Certificates_PKI.ppt differ