The older versions of OS X are still supported by Apple, but it should be more difficult to download.

My following tip can help you easily download and create USB installer for OS X Yosemite, Mavericks, Mountain Lion, and Lion.

To get the InstallESD.DMG, go to Application right mouse on OS X Yosemite select Show Package Contents.

You should have several USB stick if you want to create many installers.

Well, then: when should you sign And when should you encrypt And when should you do nothing.

There was no PGP for Dummies tutorial for OS X on the internet.

Unlike other tutorials for PGP, this tutorial does not care what program you use.

Or, you can encrypt something besides email, you can do that too.

If youre not a Mac fan, you wont understand.

Thats okay.) Many of the tutorials I found for OS X are not Mac friendly.

Many want you to install bloated, Windows-like software; or, install questionable add-ons.

Once you understand how it works, there is nothing you cannot do.

Visit the GPGTools website and download the GPG Suite for OS X.

A small window will pop up immediately and say: GPG Keychain Access would like to access your contacts.

Press OK.

Also, check the box that says Upload public key after generation.

And once you have a passphrase selected, dont give it to other people.

For example, Pennstate55 is less preferable than I graduated from Penn State in 1955, ya heard The longer your passphrase, the more secure your key.

Since it is long, there is a tendancy you might forget it.

Dont. The consequences to that will be dire.

Turn on the Show typing option, so you can be 100 sure that youve typed in your passphrase without any spelling errors.

Then, on the right, scroll down to the subsection Text and look for a bunch of entries that start with OpenPGP.

These steps can be transposed for any kind of encryption, from any app on your computer.

You can just sign or just encrypt, but combining both operations will result in optimum security.

Conversely, when you receive a PGP-secured email, you will decrypt and verify it.

Press Command-F and type in the email address of the person you are sending your message to.

This will search the public keyserver for your friends PGP key.

Select the friends public key you just downloaded, and press OK.

After that, it will always be available in your keychain until the key expires.

For the sake of this step, I will pretend I am the recipient.

Signing also provides additional cryptographic integrity: it ensures that no one has tampered with the encryption.

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