Simulation of USSD authentication shows a non-linear 'Success Cliff' in session completion when stochastic SMS OTP blocking delay interacts with fixed session time budgets.
Using USSD-based mobile payment in context of low internet connection,
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Modeling Failure Dynamics in Time-Constrained Authentication Systems: Evidence of a Success Cliff in USSD Workflows
Simulation of USSD authentication shows a non-linear 'Success Cliff' in session completion when stochastic SMS OTP blocking delay interacts with fixed session time budgets.