diff --git a/presentations/11a_Certificates_PKI.ppt b/presentations/11a_Certificates_PKI.ppt
index 87fdd5f718ddbfc78cae509a74b6201152bb5c67..ad2cd75517b310d167061cdd9a33a9827e81342d 100644
Binary files a/presentations/11a_Certificates_PKI.ppt and b/presentations/11a_Certificates_PKI.ppt differ