EP2883130A1

EP2883130A1 - Method for providing a keypad on a touchscreen

Info

Publication number: EP2883130A1
Application number: EP13721773.3A
Authority: EP
Inventors: Frank Morgner
Original assignee: Bundesdruckerei GmbH
Current assignee: Bundesdruckerei GmbH
Priority date: 2012-08-09
Filing date: 2013-05-13
Publication date: 2015-06-17
Also published as: DE102012214130A1; DE102012214130B4; WO2014023447A1

Abstract

The invention relates to a method for providing a keypad (112; 500) on a touchscreen (106), particularly for a document, in order to allow input of data into a data processing apparatus (100), particularly the document, using input elements (114; 504; 506) of the keypad (112; 500), wherein the method comprises the following steps: an angle of rotation is determined for the keypad, wherein the angle of rotation is independent of a current position of the touchscreen (106), the keypad (112; 500) is displayed on the touchscreen (106), wherein the keypad (112; 500) is displayed in a form rotated through the angle of rotation relative to the touchscreen (106), the relative arrangement of the input elements (114; 504; 506) being rigid in relation to one another and being independent of the angle of rotation.

Description

Method of providing a keypad on a touch screen

Description

The invention relates to a method for providing a keypad on a touch screen for enabling secure input of data via input elements of the keypad into a data processing device, a computer program product, a Signaifolge and a corresponding device for providing the keypad on the touch screen.

Smartphones, PDAs and many other devices are now equipped with touchscreens. The same applies to documents with an integrated electronic Circuit. For example, there are value and security documents in predominantly paper-based form, such as a banknote, as an electronic passport, or as a plastic-based chip card, in particular as a so-called smart card, in contact, contactless or dual-interface execution.

Touchscreens are input and output devices, which allow not only the display of images but also by touching the input of commands. Many touchscreens are operated by finger pressure. That is, the said commands are entered by pressing or swiping on the touch screen. However, wiping or pressing individual areas of the touch screen leaves fingerprints or wiping marks that could be used to reconstruct appropriate information on the touch screen. In particular, a password entered via the touch screen could be compromised on the basis of these tracks. DE 10 2010 022 368 A1 discloses a pin pad for numerical control panels, in which the control panel does not have a rigid arrangement of numbers. Instead, it alters the arrangement system every time before operation.

On the other hand, it is an object of the invention to provide an improved method for providing a keypad on a touch screen, an improved computer program product, an improved signal sequence and a corresponding improved device.

The objects underlying the invention are achieved by the features of the independent claims. Preferred embodiments of the invention are indicated in the dependent claims.

A method is proposed for providing a keypad on a touchscreen, eg a value or security document, for enabling entry of data via input elements of the keypad into a data processing device, eg also the said document, the method comprising the steps: Determination of a rotation angle for the keypad, wherein the rotation angle is independent of a current position position of the touch screen,

- Display the keypad on the touch screen with the keypad rotated by the angle of rotation relative to the touch screen. The relative arrangement of the input elements to each other are rigid and independent of the rotation angle.

Embodiments of the invention could have the advantage that in particular a permutation of the input elements of the keypad is no longer necessary. Instead, the user can use the familiar arrangement of the input elements to simply input the data into the data processing device in the usual manner via the input elements of the keypad by simply "back-off-center turning ¹ " of the touchscreen. By the "Hinterherdrehen" of the touch screen so take the input elements of the keypad and thus the keypad a position relative to the Bertachter a, which he is "used". In case of a permutation of the input elements, users may be overwhelmed with a newly "swung" keypad, in part because users may prefer to memorize the (relative) positions of the keys to be pressed rather than the concrete, for example string, of a password The described method thus enables a user-friendly input of data, in particular of passwords, into the data processing device, which nonetheless makes it more difficult to attack the data, for example by analyzing fingerprint traces It should be noted that within the scope of the invention an input element is considered to be a digital input Display element is understood, which is displayed on the touch screen and on which a corresponding input a corresponding input is expected by the user, so the input elements are so dynamically generated display elements of the touchscreen. The totality of the input elements which can be used for the input of the said data defines the so-called "keypad." Furthermore, in the context of the present invention, the touch screen is understood to be that touch screen which as a physical unit is capable of displaying images and touching parts of the image. The "position of the touch screen" is understood to mean the position which the touch screen occupies relative to its spatial environment. It is irrelevant in the context of the present invention for the display of the keypad, whether now the touch screen is kept "upside down" is kept rotated by 90 ° or whatever the current position of the touch screen, as for example by means of corresponding position sensors According to one embodiment of the invention, the method further comprises scaling the keypad while maintaining the aspect ratio of the keypad, in particular, it is advantageous if the keypad display always takes place in a same predefined area of the touchscreen, regardless of the angle of rotation then, preferably, the scaling is done so that the key field is always adjusted and displayed within the predefined range, ensuring that all input elements are always equally available to the user for inputting data regardless of the current rotation angle of the keypad supply available. In particular, it could be offered here that the scaling takes place in such a way that the keypad is always displayed completely fitted in the predefined area.

According to one embodiment of the invention, the angle of rotation is determined randomly. This can have the advantage that a reconstruction of the given data on the basis of fingerprint traces is made more difficult.

According to one embodiment of the invention, the rotation angle is selected from an integer multiple of 45 °. According to one embodiment of the invention, a set of predetermined positions on the touch screen is provided for the display of the input elements, wherein the rotation angle is selected so that after a rotation, the input elements always come to rest on the set of predetermined positions. This considerably complicates a reconstruction of which position was assigned to which input element during an input. In particular, if the input elements would occupy very specific and unique positions at a small number of possible rotation angles, it would then be possible to subsequently reconstruct the data input by analyzing the fingerprint traces in a high probability. By choosing predetermined positions, however, a fingerprint on one of the predetermined positions is always equivalent to a fingerprint on a different position. Thus, depending on the angle of rotation, the input elements remain above the predetermined positions.

According to one embodiment of the invention, the keypad is a pinpad. For example, when the keypad is displayed, alphanumeric characters are displayed using the input items. Alternatively, when the keypad is displayed, input points can be displayed using the input elements. The latter input points are often used to unlock smartphones by wiping users in a predefined pattern over the input points. If the swipe pattern on the input points matches a previously defined swipe pattern, the smartphone is unlocked.

In particular, in the case of the use of input points by means of the input elements, it is advisable that a resulting predetermined orientation of the keypad and thus the input points is displayed together with the keypad rotated by the rotation angle relative to the touch screen. Thus, the user knows figuratively speaking, where within his abstract keypad, which has only input points, is "up" and "down". The user Thus, by appropriate Nachrotation of the touch screen, the keypad bring back into a position in which he can make his data input, for example in the form of the swipe pattern in the usual way on the input points.

The orientation can be displayed in a variety of ways along with the keypad. For example, this can be done by an arrow indicating the orientation, or a bar, which is located above or below the keypad. However, it is also possible again to use the abovementioned position sensors of the data processing device, in particular a mobile data processing device, in order to output a corresponding signal upon detection of a predetermined position of the rotated keypad relative to the horizontal earth surface or the user. For example, the now correct orientation of the touch screen could be signaled by a corresponding display on the touch screen or a device carrying the touch screen.

According to one embodiment of the invention, the input elements are arranged on a circular path. This has the advantage that after a rotation of the keypad the input elements can automatically be perfectly located on the original image. No scaling is necessary here, which simplifies the display of the keypad on the touch screen. In particular, no elaborate recalculations of the graphics of the keypad are necessary. Here, it is particularly appropriate, as described above, to provide that a set of predetermined positions on the touch screen is provided for the display of the input elements, wherein the rotation angle is selected so that after a rotation the input elements always on the set of predetermined Positions to come to rest.

A correspondingly circular pin pad can have one or more of the circles on which the input elements are arranged. For example, such a pinpad could be designed as a compass or analog clock to provide an interface known to the user. In another aspect, the invention relates to a computer program product having instructions executable by a processor for performing the method steps described above.

In a further aspect, the invention relates to a signaling sequence which, when stored in a computer, represents a sequence of instructions which, when executed on that computer, performs the method previously described. In a further aspect, the invention relates to an apparatus for providing a keypad on a touch screen for enabling entry of data via keypad input elements into a data processing apparatus, the apparatus comprising: means for determining a keypad rotation angle, the rotation angle being independent of is a current position of the touch screen,

- middle! to display the keypad on the touch screen, wherein the key fiddle is displayed rotated by the angle of rotation relative to the touch screen, wherein the relative arrangement of the input elements to each other is rigid and independent of the rotation angle.

According to one embodiment of the invention, the device is a document. The document then comprises an electronic display device and a touch-sensitive area "touchpad", which together form the touchscreen.

According to embodiments of the invention, the document is card-shaped, for example as a chip card. The electronic display device is arranged, for example, on or in the document body of the document that the display generated by the display device visually by the front of the document User is perceptible. For example, the display device is controlled by the processor means of the document for displaying textual data or other data, such as a photo, barcode and / or icon of a graphical user interface. For example, the display device is arranged on or in a document layer below the uppermost layer of the document, wherein the uppermost layer is transparent at least in the region of the display device.

The touchpad of the document, on the other hand, is disposed on or in the document body such that it is operable from a back of the document by the user to input a signal into the processor means. For example, a touchpad sensor is disposed on or in a layer above the lowermost layer of the document forming the back of the document. The touchpad sensor and the underlying layer or layers of the document then form the touchpad of the document.

According to embodiments of the invention, the document is a paper-based and / or plastic-based document, in particular a value or security document, such as an identity document, in particular a passport, identity card, visa or driver's license, vehicle registration document, vehicle registration document, company card, health card or a another ID document or a chip card, means of payment, in particular a banknote, bank card or credit card, a bill of lading or other proof of entitlement.

According to one embodiment of the invention, the display device and the touchpad form a structural unit which is arranged in or on one of the layers of the document body. In the following, preferred embodiments are explained in more detail with reference to the drawings. Show it: FIG. 1 shows a schematic view of a smartphone with a touchscreen,

FIG. 2 is a schematic view of a rotated keypad;

FIG. 3 is a schematic view of a rotated keypad;

FIG. 4 is a schematic view of a scaled keypad;

FIG. 5 shows a schematic view of a touchscreen with circularly arranged input elements,

FIG. 6 shows a schematic view of the keypad of FIG. 5 after a rotation,

FIG. 7 shows a schematic view of the keypad of FIG. 5 after a rotation,

FIG. 8 shows an exploded view of a document with a touchscreen,

Figure 9 is a block diagram of a document with touch screen.

Hereinafter, similar elements will be denoted by like reference numerals. FIG. 1 shows a data processing device, whereby a smartphone 100 is assumed here without limiting the generality. It should be noted, however, that in the context of the entire invention, a data processing device can be used in any form, which has the input of data via a touch screen, in particular a document, such as a value or security document, eg in card form. It should therefore be understood that the term of the smartphone as a data processing device can also be consistently replaced by document or smart card. The touch screen can be integrated into the data processing device, as in the case of a smartphone, for example, or else the touch screen could be connected to the data processing device via a cable. It is also possible that the touch screen is rotatably integrated in a data processing device. The latter would be offered, for example, at bank terminals, so that the user can persist when entering the data in its position in front of the terminal. The smartphone 100 has a memory 102 for storing corresponding instructions for carrying out the method described above. The instructions may be executed by a processor 104 to perform the method steps described above. The smartphone 100 also has a touchscreen 106 which is capable of visually displaying a variety of contents to a user. Further, a user may enter commands into the smartphone 100 via the touch screen 106. For example, the touchscreen 106 has a display area 108, and an input area 1 10. The input area 1 10 serves, for example, to enter a PIN of the user to unlock the smartphone. The display 108 could display a text such as "Please enter your PIN." Further, the display 108 could indicate an "OK" input element, whereby a user would enter their PIN completely via a keypad 12 as indicated in the input area 110 will, to confirm.

The keypad 1 12 has nine different input elements 1 14 in the present example, which are labeled with the numbers 1 - 9.

In the following, it is assumed that a user has selected, for example as PIN, the number sequence 1475. The user would enter this PIN by successively touching with his finger the input elements 1 14, which with the numbers 1, 4, 7 and 5 are labeled. In Figure 1, these input elements are marked with an "x".

If the smartphone were stolen immediately after entering this PIN, the use of digits 1, 4, 7 and 5 could be reconstructed by reconstructing the fingerprint traces. Thus, it is highly possible that an unauthorized user can reconstruct the PIN.

In order to prevent this, as shown in FIG. 2, a rotation of the key field 112 is now performed by an angle 200, for example by 90 °. This rotation angle is thereby random and independent of the current position of the touch screen 106. It is therefore irrelevant whether the user holds the touch screen upside down at the time of entering the PIN or otherwise keeps twisted relative to the earth's surface, in the simplest case the keypad 110 rotated by integer multiples of 45 ° in a random manner, ie by 0, 45, 90, 135, 315 °. With no information on how many degrees the keypad has been rotated, the number of possible PIN combinations is increased by a factor of x even after the fingerprints have been analyzed, where x is the number of all possible rotations. In the above example, when rotating through 45 °, there is a factor of 8. This will minimize the likelihood of guessing the PIN by analyzing fingerprint traces.

Nevertheless, a user can enter his PIN in the usual way, by turning the entire touchscreen 106 in the example of FIG. 2 by 90 ° in the clockwise direction. Then the keypad 112 reappears in the usual way, as shown in Figure 1. Now the user can enter his PIN in the usual way, which is also possible if he has memorized only the relative positions of the input elements to be pressed 114, instead concrete number sequence 1475 of the PIN.

In Figure 3, the keypad 112 of Figure 1 is rotated 45 ° counterclockwise. This results in that with respect to the input elements to the numbers 3 and 7 these two input elements can no longer be completely displayed in the input area 1 10. The reconstruction of a fingerprint at the lower immediate edge of the input area 1 10 could thus be easily associated with the pressing of the button 7. In order to avoid this or to provide the user completely and for others non-reconstructable a keypad 12 even with larger keypads, the keypad is preferably scaled while maintaining its aspect ratio. This is shown in FIG.

The keypad is shown in FIG. 4 rotated 45 ° counterclockwise completely within the input area 110. By turning the touchscreen 106 45 ° clockwise, the user can enter his PIN in the usual way in the keypad.

FIG. 5 shows an example of a keypad having input points 504. The input points 504 are arranged in a circular manner, it being assumed in the following that an unlocking pattern for using the touchscreen 106 should be entered by means of a corresponding wiping function via the darkly marked input points 506. The user thus begins with that input point, which is seen in the direction of 3 o'clock in the input area 1 10 of FIG. 5, and then moves counterclockwise to the input point at 1:30 o'clock, then to the input point at 10:30 o'clock and then to the input point at 9 o'clock. By sweeping the said input points 506 in the said order, the touch screen is unlocked. For authentication, the user merely inputs a pattern in which he passes the various points 504.

In order to make it more difficult to compromise this pattern by analyzing the fingerprint traces, the keypad 500, which includes the input points 504 (ie the input elements), can again be rotated. The rotation takes place here by a rotation angle, for example in the counterclockwise direction 508. This rotation angle is again independent of the current positional position of the touchscreen 106 and also after rotation is the relative arrangement the input elements (the input points) 504 rigid and independent of the rotation angle.

The result of the 45 ° counterclockwise rotation is shown in FIG. As a result, relative to the touch screen 106, the input points 506 to be touched for authenticating the user are now located at the positions 1:30, 0:00, 9:00 and 7:30.

In order for a user to be able to recognize how the input elements are arranged relative to the touchscreen 06 after said rotation, a digital alignment element 502 is displayed in addition to the keypad 500. Alignment element 502 is generally located at 6 Uh of keypad 500. If the user now rotates touchscreen 106 with alignment element 502 facing him, he will always see a keypad 500 corresponding to the keypad shown in FIG , He is now able to enter his pattern for unlocking the touch screen 06 by merely noting the relative positions of the input points to be crossed.

It should be noted at this point that, in addition to the unlocking of the touchscreen 106, corresponding patterns can also be used for inputting any P! N for any purpose.

In FIG. 7, the keypad 500 has been rotated 35 degrees relative to its positioning in FIG. Specifically, in the case of FIG. 5, it is determined with respect to the possible rotation angles that a rotation angle should be selected from an integer multiple of 45 °. This ensures that the input elements 504 come to rest perfectly on the original image of FIG. 5 after any rotation because of their circular arrangement. The input points 504 shown in FIGS. 5, 6 and 7 thus define a set of predetermined positions on the touchscreen 106, wherein the rotation angle is selected such that after a rotation the input elements 504 always come to rest on this set of predetermined positions. Again, without information on how many degrees the keypad 500 has been rotated, the number of possible PINs has been increased by a factor of x even after fingerprint analysis, x again being the number of all possible turns, in the example of FIG Figures 5, 6 and 7 results in the rotation of 35 ° each a factor of 8 results. This significantly increases the security of a corresponding PIN entry, since attacks on the PIN are complicated by analysis of the fingerprint traces. Nevertheless, the user interaction with the touch screen 106 is almost identical to a static keypad because the relative positions of the individual input elements to each other are not changed. This results in a user-friendly but very secure PiN input.

FIG. 8 shows an exploded view of a data processing system 100 in the form of a document with a touch screen.

The document 100 is a value or security document, such as an ID document, passport, ID card, driver's license, access card, credential, bank card, credit card, bill, or the like.

The document 100 has a document body 1460 having a layered construction. The front side of the document 100 is formed by the uppermost layer 1480, which is, for example, a laminated transparent plastic cover layer. The back of the document 100 is formed by the lowermost layer 1500, which may also be a laminated plastic overlay. The layer 1500 may, for example, be printed all over.

Between the layers 1480 and 1500 of the document body 1460 there are further layers, in particular a layer 1520. The layer 1520 carries a display device 1020 and an electronic circuit 1040, which is arranged here next to the display device 1020 on or in the layer 1520. The display device 1020 may be unlit, backlit, front lit or self-luminous. For example, the display device 020 is a bistable display device in which a display can be reproduced permanently without power supply. For example, if the document 100 is not energized or disabled, then, for example, the user's facial image may be displayed on the bistable display 1020 in a particular view. The layer 1480 is transparently formed, at least within its area 154 covering the display device 1020, so that a user on the display device 1020 can visually perceive a reproduced image from the front of the document 100 through the area 154.

In the embodiment considered here, a touchpad sensor 1560 is arranged below the display device 1020. Here, the touchpad sensor 1560 has approximately the same shape and size as the display device 1020. For example, the display device 1020 may be disposed on the upper surface of the layer 1520 and the touchpad sensor 156 may be disposed on the lower surface of the layer 1520. However, the display device 1020 and the touchpad sensor 1560 may also form a structural unit or be arranged on different ones of the layers.

The touchpad sensor 156 may be a resistive or capacitive touchpad sensor. The integration of the touchpad sensor 560 into the document body 1460 results in a touchpad that is touch-sensitive and / or proximity-sensitive in the region 1580 of the layer 1500 that covers the touchpad sensor 1560, and that detects a position signal 168 {cf. Fig. 2) with the sensed coordinates.

The document 100 has an electronic circuit 1040. The circuit 104 is configured to drive the display device 1020 such that a specific display is generated on the display device 1020. Further, the circuit 1040 is configured to receive the position signal from the touchpad sensor 1560.

For example, the position signal may indicate the coordinates of a position of a user's finger 1600 in the region 1500 currently sensed by the touchpad sensor 1560. By way of example, the position signal includes the XY coordinates of the sensed position of the finger in a reference system of the touchpad sensor 1560, here the Cartesian coordinate system 162. The position signal is processed by the electronic circuit 1040. As a result of the processing of the position signal by the circuit 1040, for example, the position of a cursor displayed on the display device 1020 may be changed, an image or a picture element may be selected for display on the display device 020, or another action other than the currently selected one Position depends, be triggered.

FIG. 9 shows a block diagram of the document 00, which corresponds to the embodiment of FIG. The circuit 1040 in this embodiment includes an electronic memory 102 in which, for example, textual data 1650 and / or image data 1660 are stored. The textual data 1640 may be, for example, information about the owner of the document 100, i. for example, the holder of the identification document, and / or the authority issuing the document. The image data 166 may include, for example, one or more of the owner's digital facial images, a two-dimensional barcode, a symbol, or other data that may be displayed as an image on the display device 020.

For example, the image data 1660 includes an image sequence consisting of the images B1-Bn, wherein for each of the images a corresponding image data set is stored in the electronic memory 102 (compare the embodiment according to FIG. The electronic circuit 1040 includes a processor 104 for executing program instructions 1080. The electronic circuit 1040 further includes a driver 1060 through which the processor 104 may drive the display device 020 to reproduce data stored in the memory 102.

From the touchpad sensor 1560, the processor 104 may receive the position signal 1680 indicative of one or more currently sensed positions. The position signal 1680 is evaluated by the processor 104 by executing the program instructions 1080 to drive the display device 1020 in response to a result of the evaluation of the position signal 1680 by means of the driver 1060 to generate a particular display.

For example, the position signal! 1680, a selection of data stored in memory 102 for display on display 1020 is made. In particular, the program instructions 108 can generate a graphical user interface which contains a so-called cursor, that is, a pointer, with which, for example, certain picture elements, in particular icons, displayed on the display device can be selected. The desired position of this cursor is e.g. determined by the position of the finger 1600 relative to the touchpad sensor 1560 and in the form of the position signal 1680 of the

Touchpad sensor 1560 communicates with the program instructions 1080 so that they can track the display position of the cursor the position signal 1680. Overall, in FIGS. 8 and 9, the touchpad sensor 1560 and the display device 020 form the touchscreen, as explained with reference to FIGS. 1-7. Reference number list

100 smartphone

102 memory

04 processor

06 touchscreen

108 display

110 input area

112 keypad

114 input elements

200 rotation

500 keypad

502 alignment element

504 entry point

506 entry point

1460 document body

1480 shift

1500 layer

1520 shift

1540 area

1560 touchpad sensor

1580 area

1600 fingers

1620 coordinate system

1640 textual data

1660 image data

1680 position signal

Claims

claims

, A method of providing a keypad (12; 500) on a touch screen (106) to enable entry of data via input elements (114; 504; 506) of the keypad (112; 500) into a data processing device (00), the method the following steps include:

Determining a rotation angle for the keypad, wherein the rotation angle is independent of a current position position of the touch screen (106),

Displaying the keypad (112; 500) on the touch screen (106) with the keypad (112; 500) rotated by the angle of rotation relative to the touch screen (106), the relative location of the input elements (114; 504; 506 ) is rigid with each other and independent of the angle of rotation.

The method of claim 1, further comprising scaling the keypad (112; 500) while maintaining the aspect ratio of the keypad (112; 500).

3. The method of claim 2, wherein the display of the keypad (12; 500) regardless of the rotation angle is always in a same predefined area of the touch screen (106), wherein the scaling is such that the keypad (2; 500) always in the predefined area is fitted.

The method of claim 3, wherein the scaling is such that the keypad (112; 500) is always displayed fully fitted in the predefined area (110).

5. The method according to any one of the preceding claims, wherein the rotation angle is determined randomly.

6. The method according to any one of the preceding claims, wherein in the determination of the rotation angle is selected from an integer multiple of 45 degrees.

7. Method according to one of the preceding claims, wherein a set of predetermined positions is provided on the touchscreen (106) for the display of the input elements (114; 504; 506), wherein the rotation angle is selected so that after a rotation the input elements (14 504, 506) always come to rest on the set of predetermined positions.

The method of any one of the preceding claims, wherein the keypad (112; 500) is a PIN pad.

9. The method of claim 8, wherein in the display of the keypad (1 12;

500) alphanumeric characters are displayed by means of the input elements (1 14; 504; 506).

10. The method of claim 8, wherein in the display of the keypad (1 12;

500) input points are displayed by means of the input elements (4; 504; 506).

The method of claim 10, wherein the keypad (1 12; 500) has a predetermined orientation, the orientation being displayed rotated by the angle of rotation relative to the touchscreen (106) together with the keypad (1 12; 500).

12. Computer program product with executable by a processor instructions for performing the method steps according to one of the preceding claims.

13. A sequence of signals which, when stored in a computer, represents a sequence of instructions which, when executed on that computer, performs the previously described method.

14. A device for providing a keypad (1 12; 500) on a touch screen (106) for enabling entry of data via input elements (14; 504; 506) of the keypad (1 2; 500) into a data processing device (14). 100), the device comprising:

Means for determining a rotation angle for the keypad, the rotation angle being independent of a current positional position of the touchscreen (106),

- middle! for displaying the keypad (1 2; 500) on the touch screen (106), the keypad (112; 500) being rotated by the angle of rotation relative to the touch screen (106), the relative location of the input elements (114; 504; 506) is rigid relative to one another and independent of the angle of rotation.

15. The apparatus of claim 14, wherein the device is a document.