Multi-factor authentication

1. A method, comprising:

providing, by a processor operable to execute logic encoded on one or more non-transitory computer-readable media, a notification to an intended recipient of a message, the notification including a designated link operable to facilitate access to the message, the designated link including a unique identifier associated with the message, the unique identifier generated for the message and distinct from login credentials, wherein the unique identifier is not displayed to a user;

receiving a request to access the message;

authenticating the request according to an authentication procedure, the authentication procedure including selecting which authentication factors are to be verified based on whether the request corresponds to the designated link, wherein:

the request corresponds to the designated link if the request includes the unique identifier from the notification provided to the intended recipient;

the selected authentication factors correspond to login credentials if the request includes the unique identifier such that authentication is successful once valid login credentials associated with the intended recipient have been received; and

the selected authentication factors correspond to login credentials and at least one additional authentication factor only if the request fails to include the unique identifier; and

communicating the message if the request passes authentication.

2. The method of claim 1 , further comprising:

sending a request for the login credentials associated with a user, the request for login credentials sent in response to the request to access the message.

3. The method of claim 1 , wherein the recipient corresponds to an email account.

4. The method of claim 1 , wherein:

the designated link comprises a user-readable portion and a machine-readable portion, the machine-readable portion including the unique identifier; and

the notification configured to display the user-readable portion to a user and to hide the machine-readable portion from the user.

5. The method of claim 1 , wherein:

the message comprises an encrypted message; and

communicating the message comprises:

decrypting the message; and

communicating the message over a secure connection.

6. The method of claim 1 , further comprising:

determining that the request fails to correspond to the designated link provided to the intended recipient; and

initiating a fallback authentication procedure.

7. The method of claim 1 , wherein the unique identifier portion of the designated link is hidden from the user such that if the request only includes a portion of the designated link that is visible to the user, the method determines that the request fails to include the unique identifier and therefore fails to correspond to the designated link.

8. One or more non-transitory computer-readable media comprising logic, the logic when executed by one or more processing units operable to perform operations comprising:

providing a notification to an intended recipient of a message, the notification including a designated link operable to facilitate access to the message, the designated link including a unique identifier associated with the message, the unique identifier generated for the message and distinct from login credentials, wherein the unique identifier is not displayed to a user;

receiving a request to access the message;

authenticating the request according to an authentication procedure, the authentication procedure including selecting which authentication factors are to be verified based on whether the request corresponds to the designated link, wherein:

the request corresponds to the designated link if the request includes the unique identifier from the notification provided to the intended recipient;

the selected authentication factors correspond to login credentials if the request includes the unique identifier such that authentication is successful once valid login credentials associated with the intended recipient have been received; and

the selected authentication factors correspond to login credentials and at least one additional authentication factor only if the request fails to include the unique identifier; and

communicating the message if the request passes authentication.

9. The media of claim 8 , the logic further operable to perform the operations comprising:

sending a request for the login credentials associated with a user, the request for login credentials sent in response to the request to access the message.

10. The media of claim 8 , wherein the intended recipient corresponds to an email account.

11. The media of claim 8 , wherein:

the designated link comprises a user-readable portion and a machine-readable portion, the machine-readable portion including the unique identifier; and

the notification configured to display the user-readable portion to a user and to hide the machine-readable portion from the user.

12. The media of claim 8 , wherein:

the message comprises an encrypted message; and

communicating the message comprises:

decrypting the message; and

communicating the message over a secure connection.

13. The media of claim 8 , the logic further operable to perform the operations comprising:

determining that the request fails to correspond to the designated link provided to the intended recipient; and

initiating a fallback authentication procedure.

14. A system, comprising:

one or more processors operable to execute logic encoded on one or more non-transitory computer-readable media in order to:

provide a notification to an intended recipient of a message, the notification including a designated link operable to facilitate access to the message, the designated link including a unique identifier associated with the message, the unique identifier generated for the message and distinct from login credentials, wherein the unique identifier is not displayed to a user;

receive a request to access the message;

authenticate the request according to an authentication procedure, the authentication procedure including selecting which authentication factors are to be verified based on whether the request corresponds to the designated link, wherein:

the request corresponds to the designated link if the request includes the unique identifier from the notification provided to the intended recipient;

the selected authentication factors correspond to login credentials if the request includes the unique identifier such that authentication is successful once valid login credentials associated with the intended recipient have been received; and

the selected authentication factors correspond to login credentials and at least one additional authentication factor only if the request fails to include the unique identifier; and

communicate the message if the request passes authentication.

15. The system of claim 14 , the one or more processors further operable to:

send a request for the login credentials associated with a user, the request for login credentials sent in response to the request to access the message.

16. The system of claim 14 , wherein:

the designated link comprises a user-readable portion and a machine-readable portion, the machine-readable portion including the unique identifier; and

the notification configured to display the user-readable portion to a user and to hide the machine-readable portion from the user.

17. The system of claim 14 , the authentication procedure further including verifying authentication information corresponding to at least one of a username, a passcode, personal information, device information, or biometric data.

18. The system of claim 14 , wherein:

the message comprises an encrypted message; and

the one or more processors further operable to:

decrypt the message; and

establish a secure connection for communicating the message.

19. The system of claim 14 , the one or more processors further operable to:

determine that the request fails to correspond to the designated link provided to the intended recipient; and

initiate a fallback authentication procedure.