Secure Your Bitcoin Wallet
If you don't have a Blockchain.info wallet, please see My
guide "Setting up your first Bitcoin wallet !".
Once you have done that, go into your Account settings. On the left
side of the page, under Account Information, you will see
Personal. Click on it, then enter an email address,
an alias, and verify your phone number. The alias allows you to login with something
memorable, rather than the long default string of characters. You can use something
simple like your full name.
Under Personal, you will see General. Click on it, and set an inactivity logout time
(I use 30 minutes), and set your Default Fee Policy to normal, or generous.
Under General, you will see Display. Click on it, and set your local currency. You can
change the other settings if you like too.
Under Display, you will see Notifications. Click on it, and change the settings to
whatever you want.
Under Notifications, you will see Passwords. Click on it, and then Show / Hide Password
Mnemonic. Write down your mnemonic; keep it safe. Now choose a second password. Make it
something you will never forget. Write it down; keep it safe. Also, fill in a password hint.
Should you leave your browser open while you're still logged in, the secondary password
you entered will prevent someone from sending coins out of your account. It does this by
prompting you for a second password anytime you try to send coins.
Congratulations, your account is now much safer; however, there is one more security
measure you can take to make your account virtually unhackable. It is called Two Factor
Authentication.
Two-factor Authentication
Two-factor authentication is a security process in which the user provides two means
of identification, one of which is typically a physical token, such as a card, and the
other of which is typically something memorized, such as a security code. In this context,
the two factors involved are sometimes spoken of as something you have and
something you know. A common example of two-factor authentication is a bank card: the card itself is
the physical item and the personal identification number (PIN) is the data that goes
with it.
Moving on, under Passwords, you will see Security. Click on it, and then select an
option from the drop down menu. Blockchain.info gives you a couple of different options
for two factor authentication: SMS, email, Yubikey, and Google Authenticator. We highly
recommend either using a Yubikey, or Google Authenticator. If you choose Google Authenticator
you need to download the Google Authenticator app from the App Store (iPhone), or the
Play Store (Android).
Google Authenticator
Because Google Authenticator is the quickest and easiest to set up, I'm going to use
it as an example.
Download Google Authenticator from the App Store (iPhone), or the Play Store (Android).
Once you have done this, go back to your computer, and in the Security settings,
choose Google Authenticator from the drop down menu. A large QR code will be displayed.
Open the Google Authenticator app on your smartphone and choose Scan a barcode. Then
scan the barcode displayed on your computer's screen. After scanning the QR code,
the app will display a 6 digit code that changes every 30 seconds. Enter this into
the box below the QR code on your computer screen.
Congratulations, because an attacker would need to know your main password, your
secondary password, AND have access to your smartphone in order to enter your authenticator
code, your account is now virtually unhackable!
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