>>Hi,
>>
>>I need to send someone a confidential document. Currently it is an Excel spreadsheet. I know it is impossible to make it 100% secure against all kinds of hackers. But 90% is good enough (or whatever it is). How can I encrypt this document? Should I convert it to a PDF and encrypt PDF? Or encrypting Excel is ok? I don't want to download and install any 3P tools, just whatever I have on my Windows 7. With the intent that the recipient will open it on a Mac computer.
>
>I'd work with the delivery method, rather than the document itself. For example, deliver it via a shared DropBox.
I thought about it. But is Dropbox secure? That is, I can put this document in my Dropbox and give the recipient access to this folder/file. But then a hacker can hack my dropbox, no? I would prefer to do it over Dropbox but I never thought that it was very secure (maybe I am mistaken).
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
