Choose a different password for each site. Passwords should be randomly generated and consist of at least thirty-two capital and lower-case letters, numbers, and symbols. Write all your passwords longhand in a memorandum book and store the book in a safe deposit box at a bank at least twenty miles from your computer.

Do not expose your computer to radio waves of any kind.

If you have a Windows computer, remember that certain kinds of programs can markedly increase your chances of infecting your computer with viruses or other malware. Among the programs you should avoid at all costs are Web browsers, word processors, email clients, spreadsheets, presentation programs, games, databases, text editors, appointment calendars, image editors, media players, publishing programs, drawing programs, and the operating system.

Ask a random stranger to pick a login password for your computer. Do not allow her to tell you what it is.

For secure deletion of data, dynamite is best, but good results may also be achieved with a shotgun.