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A.1.7.2 Use Frame Display to View Encryption/Decryption Process
A.1.7.2.1 Security Manager Protocol
The Security Manager Protocol (SMP) controls the process for pairing and key distribution. The results of a pairing
and key distribution can be observed in the ComProbe software Frame Display. Activate the Frame Display by
clicking on the icon on the Control window toolbar. On the Frame Display low energy protocols are shown in light
green tabs. Click on the SMP protocol tab that will show only the SMP commands from the full data set.
Figure 9 - SMP Pairing Request (Frame# 35,539) from Initiator (Side 1)
On the left side of the figure above is the Frame Display Decoder pane that shows the decoded information
supplied in the selected frame in the Summary pane, Frame# 35,539. Shown is the SMP data associated with and
encrypted link (MITM Protection = Yes). The requested keys are also shown. Selecting Frame# 35,545 would
provide the response from the responder (Side 2) and would contain similar information.
Selecting Frame# 39,591 will display the Pairing Confirm from the initiator (Side 1) in the Decoder pane. The
Confirm Value shown is the Mconfirm 128-bit random number that contains TK, Pairing Request command,
Pairing Response command, initiating device address, and the responding device address. Selecting Frame#
39,600 would provide the Sconfirm random number from the responder (Side 2) with similar information from
that device but the random number would be different than Mconfirm.
Once pairing is complete and an encrypted session established, the keys are distributed by the master and slave
now identified by Side = M and Side = S respectively in the Summary pane. In Frame# 39,661 the slave has
distributed LTK to the master to allow exchange of encrypted data. Frame# 39,661 through 39,714 in the
Summary pane SMP tab are the key distribution frames.
Figure 10 - SMP Pairing Confirm (Frame# 39,591) from Initiator (Side 1)
TELEDYNE LECROY Appendicies
217 Frontline BPA low energy Hardware & Software User Manual