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4. Comparing with one-factor authentication, two-factor authentication provides more protection to the user identity in online services. Please compare three different types of currently available

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4. Comparing with one-factor authentication, two-factor authentication provides more protection to the user identity in online services. Please compare three different types of currently available techniques for second factor with regarding to (a) Loss of second factor (b) Password cracking (c) Eavesdropping (d) Trojan horse or Key logging (e) Men-in-the-Middle prevention

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