Breaking Safaricom Scratch Card Code


BLACKORWA

Almost two years ago, Safaricom Ltd extended the scratch card code from 12 digits to 16 in-order to increase the computational time required to break the code thereby making them more secure. However, system theory acknowledges that systems expose their weaknesses at points of change. I set to find out if the move to higher dimensionality introduced a weakness in the scratch card hidden reload number. To begin the analysis I formulated the following assumptions to guide me in the process.

  • The grouping of the hidden reload number into four digits does not reveal the mechanics of the number generator.
  • Increasing the hidden reload number by a factor of four digits provides more data for statistical analysis.
  • The hidden reload numbers are separated into groups of four digits only for the purposes of ease of reading.
  • The hidden reload number represents a 16 digit number generated by a random number…

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