Elsevier "Computers & Security" journal latex template
You don't need to use a specific template to submit your paper to this journal.

https://www.elsevier.com/journals/computers-and-security/0167-4048/guide-for-authors


  As part of the Your Paper Your Way service, you may choose to submit your manuscript as a single file to be used in the refereeing process. This can be a PDF file or a Word document, in any format or lay-out that can be used by referees to evaluate your manuscript.


So any generic format would be fine, e.g. the basic LaTeX article class.  If your paper is accepted, either you or they will redo the formatting for publication, and they'll give you the correct template if necessary.  But there is no point spending any time on that now.