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Monday, November 24, 2014

CCID descriptor statistics: wLcdLayout

Article from the serie "CCID descriptor statistics"

The wLcdLayout field is a number value from the CCID USB descriptor:
Number of lines and characters for the LCD display used to send messages for PIN entry.
XX: number of lines
YY: number of characters per line. XXYY=0000h no LCD.

0x000023793.31 %
0x021062.36 %
0x021151.97 %
0x020C41.57 %
0x081810.39 %
0x100210.39 %

The majority (93,31%) of readers do not have a display so 0 lines and 0 characters per line.

We then have pinpad readers with a display. The most common configurations are 2 lines of 12, 16 or 17 characters.

One reader, VASCO DP865, has a big display with 8 lines and 24 characters per line.

One reader, REINER SCT cyberJack go, is bogus and has XX and YY reversed. The screen has 2 lines of 16 characters and not 16 lines of 2 characters. It is obvious when looking at the reader picture.