i need to secure one file on both my e-mail and on my documents

[sophia]

i need to secure a file on my e-mail nd one on "my documents" so that only i
can have access to the information how do i go about doing this

 

[Gordon]

i need to secure a file on my e-mail nd one on "my documents" so that only
i
can have access to the information how do i go about doing this

And what sort of "file" might this be?