An electronic door lock that mounts to a door, the door including an inner side and an outer side and the electronic door lock is operable to control access to an access controlled area positioned adjacent the inner side of the door, the electronic door lock comprising: an outer base connected to the outer side of the door; an inner base connected to the inner side of the door; a locking mechanism coupled to the door and movable between a locked position and an unlocked position in response to a control signal; a control circuit operable to generate the control signal in response to an input credential; an attachment interface at least partially formed as part of the outer base; wherein each of a plurality of different types of credential readers selectively attachable and removable from the attachment interface when the outer base is attached to the door to electrically connect a selected one of the plurality of different types of credential readers to the control circuit to provide the input; and a communication module connected to the control circuit, the communication module operable to communicate with a device that is separate from the electronic door lock; characterized in that a first horizontal anti-tamper wall is positioned between the attachment interface and the locking mechanism to inhibit access to the locking mechanism from the attachment interface; a second horizontal anti-tamper wall is positioned between the first horizontal anti-tamper wall and the locking mechanism to inhibit access to the locking mechanism; the control circuit is disposed within the inner base; and each of the different types of credential readers provides its specific signal to the control circuit, and wherein the control circuit is operable to recognize the type of credential reader attached to the attachment interface, and wherein the control circuit is further operable to recognize the specific signal produced by that recognized credential reader. an outer base connected to the outer side of the door; an inner base connected to the inner side of the door; a locking mechanism coupled to the door and movable between a locked position and an unlocked position in response to a control signal; a control circuit operable to generate the control signal in response to an input credential; an attachment interface at least partially formed as part of the outer base; wherein each of a plurality of different types of credential readers selectively attachable and removable from the attachment interface when the outer base is attached to the door to electrically connect a selected one of the plurality of different types of credential readers to the control circuit to provide the input; and a communication module connected to the control circuit, the communication module operable to communicate with a device that is separate from the electronic door lock; characterized in that a first horizontal anti-tamper wall is positioned between the attachment interface and the locking mechanism to inhibit access to the locking mechanism from the attachment interface; a second horizontal anti-tamper wall is positioned between the first horizontal anti-tamper wall and the locking mechanism to inhibit access to the locking mechanism; the control circuit is disposed within the inner base; and each of the different types of credential readers provides its specific signal to the control circuit, and wherein the control circuit is operable to recognize the type of credential reader attached to the attachment interface, and wherein the control circuit is further operable to recognize the specific signal produced by that recognized credential reader.