WO 2018/057322
`
`PCT/U82017/050817
`
`1/12
`
`Time Sync
`Network
`
`{J 100
`
`Network Clock
`142
`
`140
`
`
`
`
`154w; x152
`Pdelay Exchange
`Sync Communication
`
`
`
`
`Time Info.
`134
`
`Clock 130A
`
`Clock 1303
`
`FIG. 1
`
`
`
`WO 2018/057322
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`PCT/U82017/050817
`
`2/12
`
`
`
`To/From
`Node
`1 20
`
`Network
`Interface
`210
`
`Pr0033?)"(S)
`—
`
`260
`
`
`
`
`
`ROM
`fl
`
`Cryptographic
`Accelerator
`fl
`
`
`
`
`
`252
`
`Firmware
`232
`
`fl
`
`FIG. 2
`
`Key Storage
`250
`
`/ C V Key
`
`
`
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`3 / 12
`
`Sync
`Message
`
`:90
`
`-m“-_
` slaveNonce TLV
`
`mm
`
`FIG. 3A
`
`Sync
`Follow-Up
`350
`
`/ C V TL V
`
`Header
`
`preciseOrigin Timestamp
`
`Fol/ow_Up Information TLV
`
`s/a veNonce TLV
`
`FIG. 3B
`
`
`
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`PCT/U82017/050817
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`4 / 12
`
`Pdelay
`Request
`
`ZSOA
`
`-m-“_
`
`
`Pdelay
`Request
`4008
`
`-“---I.
`
`
`
`
`slaveNonceTLv
`
`FIG. 4A
`
`
`
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`PCT/U82017/050817
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`5 / 12
`
`Pde/ay
`Response
`
`fiOA
`
`-“---_
`
`requestingPort/dentity Icvnv
`
`requestReceiptTimestamp
`
`Pde/ay
`Response
`4308
`
`
`
`
`
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`6 / 12
`
`Pde/ay
`Follow-Up
`
`ZSOA
`
`-_-----_
`
`responseOrigin Timestamp
`
`
`Pde/ay
`Follow-Up
`
`21903
`
`-_-----_
`
`
`
`
`masterNonce nv
`
`mm
`
`FIG. 4C
`
`
`
`WO 2018/057322
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`PCT/U82017/050817
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`7/12
`
`Integrity Check
`Value (/C V) Field
`500
`{J
`
`caters
`
`-_-----m
`
`ICV (Integrity Check Value)
`
`key/d
`
`algorithm/d
`
`Reserved
`
`Pad
`
`7
`
`FIG. 5
`
`Nonce
`Field
`600
`
`Bits
`
`-“---
`t/vape = NONCE_SLA VE or NONCE_MASTER
`
`Nonce
`
`IengthFie/d
`
`nonceCount
`
`FIG. 6
`
`
`
`WO 2018/057322
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`PCT/U82017/050817
`
`8/12
`
`Time
`
`Synchronization
`
`{J 700A
`
`Master
`
`(GM w or HSM
`
`Slave
`
`(HSM 130A, B,
`or D)
`
`130D)
`Pde/ay_Req(Nonce, / C V)
`
`II
`
`Pde/ay
`Exchange
`154
`
`:
`I
`
`I:
`
`Midpoint
`702A
`
`I
`0 T4
`I
`
`T2
`
`Midpoint
`7028 T3
`
`Pde/ay_Resp(T2, IC V)
`
`00
`
`T5
`
`Pde/ay_Fo//ow_ Up(T3, / C V)
`
`Sync Message(Nonce, IC V)
`
`FIG. 7A
`
`Sync
`Communication
`152
`
`
`
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`PCT/U82017/050817
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`9 / 12
`
`Time
`
`Synchronization
`
`{J 700B
`
`
`
`Slave
`
`(HSM 130A, B,
`or D)
`I
`
`Master
`
`(GMM or HSM
`130D)
`I
`
`Pdelay_Req(Nonce A)
`
`0 T1
`:
`Midpoint
`702A“
`'
`Pdelay_Resp(T2, Nonce B,
`:
`/C V)
`.
`I
`0 T4
`
`Pde/ay
`Exchange
`154
`
`i:
`
`Midpoint
`702B
`
`jig
`
`T3
`
`.
`
`Pdelay_Fo/low_Up(Nonce A, Nonce B,
`T3, ICV)
`
`T5 0
`
`Sync Message(Nonce A, ICV)
`
`Sync
`Communication
`152
`
`I
`E
`
`IIIIII
`
`Fol/ow_Up(Nonce A, T5, [C V)
`
`FIG. 7B
`
`
`
`WO 2018/057322
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`PCT/U82017/050817
`
`10/12
`
`Bounds Check
`800
`
`/
`
`Determine Propagation Delay
`over Network Including
`Sending First Message and
`Receiving Second Message
`810
`
`Determine Expected Offset
`Between First Time Value of
`First Clock and Second Time
`Value of Second Clock Based
`
`on First Message Departure
`and Arrival Times and Secon-
`
`Message Departure and
`Arrival Times
`
`fl
`
`
`
`Receive Synchronization
`Information Specifying
`Timestamp of Second Time
`Value
`
`fl
`
`Determine Whether
`
`Timestamp ls Valid by
`Comparing Expected Offset to
`Offset Calculated Based on
`
`Timestamp
`w
`
`FIG. 8
`
`
`
`WO 2018/057322
`
`PCT/U82017/050817
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`11/12
`
`I C V Check
`900
`
`Receive Synchronization
`Message Specifying Time
`Value Associated with
`
`Master Clock and Integrity
`Check Value(l C V)
`910
`
`Determine Whether
`
`Synchronization Message ls
`Valid Based on ICV
`920
`
`
`
`If Valid, Provide Time
`Information Associated with
`Time Value
`
`flfl
`
`FIG. 9A
`
`Nonce Check
`
`95'0/
`
`Send First Message
`Including First Nonce
`flfl
`
`Receive Second Message
`Including Second Nonce and
`Associated with Timestamp
`970
`
`Compare First Nonce to
`Second Nonce to Determine
`
`Whether Timestamp is Valid
`980
`
`
`
`If Valid, Use Timestamp to
`Synchronize Clocks
`flfl
`
`FIG. QB
`
`
`
`WO 2018/057322
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`PCT/U82017/050817
`
`12/12
`
`1000
`(J
`
`
`
`Interconnect 1080
`
`Processor
`
`Subsystem
`1020
`
`[/0
`
`Interface
`1060
`
`[/0
`De vices
`1 0 70
`
`FIG. 10
`
`
