How to read an .xls file that is encrypted with R?
excel.link can help you in opening password protected files.
You can pass your 'password' in one of the arguments.
Usage
xl.read.file(filename, ...... password = NULL)
How do I password-protect an Excel file created in R with write.xlsx?
From the xlsx manual, you can set the password in the password argument:
write.xlsx(x, file, sheetName="Sheet1", col.names=TRUE, row.names=TRUE, append=FALSE, showNA=TRUE, password=NULL)
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