SSH JumpHost and SSH Gateway Ezeelogin supports DUO Security two factor authentication ( 2FA ) which means that anyone having a smartphone these days can easily use it for the second layer of authentication. With DUO, you dont have to type in complex strings or numbers, just tap on the smartphone screen and you are securely authenticated easily. No extra devices like RSA Keys or security token generating devices has to be carried since you already have a smartphone with you to authenticate into your SSH Gateway.