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In my tutorial Creating a Cold Wallet Computer I explain that good security is in the use of many devices to conduct a log in. 2FA or 2 factor security is when you have a Username, a Password, and require the use of a device to generate or provide a PINCODE for log in. So now a thief would require all three to compromise your account. Some exchanges, wallets or other utilities do not offer 2FA as a security measure but you can create your own. I use a YUBIKEY from Yubico to do this. Most 98% of you use the same username and password credentials across many domains because of convenience a