Example 2: Dynamic time window calculation
  • 23 Jan 2025
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Example 2: Dynamic time window calculation

  • Sombre
    Lumière
  • PDF

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Résumé de l’article

Initial parameters

  • authenticator application time step: 8 seconds
  • authenticator application usage: Authentication (password validation)
  • Identification time window: 2 Digipass time steps
  • Synchronization time window: 1 hour= 3600 seconds

DTWAT

DTWAT= ((Time step * (ITimeWindow -1)) / 8) = ((8 * (2-1)) / 8) = 1 day

First authentication

A new user has not yet successfully authenticated:

Used time window= max (SyncWindow, ITimeWindow * time step)
 = max (3600 seconds, 16 seconds)
 = 3600 seconds = 450 time steps = +/- 225 time steps

Authentication before DTWAT

The user authenticates within 1 day after the last successful verification:

Used time window= ITimeWindow * time step
 = 2 time steps * 8 seconds
 = 16 seconds = 2 time steps = +/- 1 time step

Authentication after DTWAT

The user authenticates between 1 day and 449 days after the last successful verification:

Time window= Time step + (Days lapsed * 8)
  Table: Example 2: Dynamic time window calculation
 1 Day Lapsed7 Days Lapsed365 Days Lapsed449 Days Lapsed
Used time window calculation8 + (1 * 8)8 + (7 * 8)8 + (365 * 8)8 + (449 * 8)
Used time window (seconds)16 s64 s2928 s3600 s
Used time window (time steps)2 TS8 TS366 TS450 TS

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