Lists the types of encryption available for the current workbook.
Standard encryption for OpenXml (.xlsx) files that uses a binary EncryptionInfo structure. The encryption algorithm is Advanced Encryption Standard (AES) and SHA-1 is used as the hashing algorithm. For binary (.xls) files, the algorithm is RC4.
Supported in Excel 2007 and higher.
Agile encryption for OpenXml (.xlsx) files that uses an XML EncryptionInfo structure. Default encryption algorithm is AES-128.
Supported in Excel 2010 and higher.
The values listed by this enumeration are used by the EncryptionOptions.Type property.