diff --git a/presentations/11a_Certificates_PKI.ppt b/presentations/11a_Certificates_PKI.ppt
index 62a6118b9bd570d7799bb9565c582a0911c2acfe..3c174dce6fbc1e57945d7f2e379eaf7e0b70e2b2 100644
Binary files a/presentations/11a_Certificates_PKI.ppt and b/presentations/11a_Certificates_PKI.ppt differ