JUNCTION

USB DEVICE INSPECTOR

Inspect what a USB device says it is, preserve its descriptor fingerprint, and detect what changed. WebUSB is used where the browser permits it; descriptor dumps remain first-class evidence when direct access is unavailable.

DEVICE OVERVIEW

CAPTURE COMPLETENESS

0%

INTERFACE SUMMARY

Interface	Class	Subclass	Protocol	Endpoints

IMPORTANT FINDINGS

LAYERED DEVICE FINGERPRINT

SCHEMA v2

Identity, structure, capabilities, and exact available descriptor content are hashed independently. Each layer records its algorithm, schema, fields, parser version, and creation time.

PROVENANCE / DIAGNOSTICS

BROWSER API CORRELATION

NOT SCANNED

WEBHID CORRELATION

Scan previously authorized HID devices or open the browser chooser.

WEBSERIAL CORRELATION

Scan previously authorized serial ports or open the browser chooser.

Correlation is session evidence from separate browser APIs. A matching VID/PID can support device-family correlation, but it does not authenticate physical identity or supply missing USB descriptors.

DESCRIPTOR TREE

Load a device to inspect structure.

DECODED INSPECTOR

NOT AVAILABLE

Select a descriptor or normalized field.

SYNCHRONIZED HEX INSPECTOR

NO RAW BYTES

No search

Raw descriptor bytes are not available.

SOURCE EVIDENCE / TEXT FALLBACK

No raw descriptor evidence loaded.

INTERFACE MAP

DEVICE → CONFIGURATION → INTERFACE → ENDPOINT

No topology loaded.

USB CAPABILITIES

NOT AVAILABLE

No BOS capability data loaded.

HUB INSPECTOR

NOT AVAILABLE

Load device structure to inspect hub-class evidence.

USB TYPE-C EVIDENCE

NOT ESTABLISHED

Type-C related class and BOS evidence will appear here when observed.

HID INTERFACES

NO REPORT DATA

No HID data loaded.

HID REPORT INPUT

USER-SUPPLIED BYTES

TARGET INTERFACE

Paste the HID report descriptor itself, not the 0x21 HID class descriptor. JUNCTION preserves the supplied bytes and does not infer missing report data.

HID REPORT MAPS

0 REPORTS

No parsed report descriptor available.

HID REPORT ITEMS

Offset	Type	Tag	Value	Meaning

HID COLLECTION TREE

No collection hierarchy available.

COMPARISON SETUP

Current device

None loaded

Baseline

Validation policy

STRUCTURAL validates topology while allowing normal unit-specific identity strings.

RESULT

NOT RUN

Select a baseline and run comparison.

VALIDATION POLICY WORKBENCH

REUSABLE PROFILES

Policy name

Description

Allowed device revision range

Required interface classes

Prohibited interface classes

Class lists accept hexadecimal USB class codes separated by commas. Required/prohibited checks evaluate the current device even when no equivalent baseline field changed.

FIELDS THAT MUST MATCH

HIERARCHICAL DIFFERENCE ENGINE

No comparison results.

DEVICE LIBRARY 2

0 DEVICES

Search and filter locally stored device identities, tags, projects, classes, and fingerprints.

Device	VID:PID	Structure	Status	Tags / Project	Last Seen	Captures	Actions

FLEET VALIDATION

LOCAL EVIDENCE

KNOWN-GOOD BASELINE

VALIDATION POLICY

v2.5 · BATCH VALIDATION

READY

Analyze multiple descriptor exports against the selected baseline without adding them to the library.

No batch has been run.

v2.6 · MANUFACTURING ACCEPTANCE

PROFILE

Profile name

Lot / work order

Maximum actionable findings per unit

Require exact VID/PID
Require structural fingerprint match

Acceptance profile augments the selected JUNCTION validation policy; it does not replace descriptor evidence.

v2.7 · DEVICE FAMILY CLUSTERS

0 FAMILIES

Families are evidence-based clusters using VID/PID + structural/capability fingerprints. They are not proof of common physical origin or authenticity.

v2.8 · FLEET COMPARISON

LIBRARY OBSERVATIONS

Device	VID:PID	Family	Identity	Structure	Capability	Validation

v2.9 · SIGNED BASELINE LIBRARY

LOCAL KEY

Exports known-good baseline observations and policies as a portable JSON library signed with a locally generated ECDSA P-256 key. The public key travels with the bundle; the private key remains in this browser profile.

v3.0 · ACCEPTANCE RUN HISTORY

0 RUNS

RECORDED RUN

Time	Lot	Mode	Baseline	Accepted	Review

v3.0 · TOUCHSTONE HANDOFF

INTEROPERABILITY

Exports a JUNCTION evidence handoff for TOUCHSTONE containing observed USB identity, fingerprint layers, baseline references, validation policy, and comparison findings. It does not claim that TOUCHSTONE tests were run.

Load or compare a device to populate the handoff.

DEVICE CHANGE TIMELINE

0 OBSERVATIONS

Load a saved device to review immutable observations over time.

No device selected.

PHYSICAL IDENTITY NOTES

Load or select a saved device.

OBSERVATION EVIDENCE

NONE SELECTED

Select an observation from the timeline.

REPORTING 2

LOCAL GENERATION

Report type Redact serial number

USB DEVICE INSPECTION REPORT

READY

Load a device to generate a report.