Space and construction
Walls, ceilings, furniture and decorations — a physical inspection with thermal imaging and a non-linear detector (NLJD), which can find even a switched-off mini-recorder.
Expertly updated
Protection against eavesdropping
Defense technical inspection against eavesdropping (TSCM)
Defensive technical inspection for wiretapping and hidden devices — before a sensitive meeting and after information has been leaked from a narrow circle.
defense technical inspectionfinding report with spectrum recordingmode of action
He is responsible for this service
Head of the operational department
GBH Group Operational Command
Risk does not arise from one box
The risk of eavesdropping does not come from a single hidden device. It arises from a combination of the space, the technology used, people's habits and a poorly set meeting schedule. Those who deal with acquisitions, disputes, personnel or family matters in the room tend to be at risk — and this is discussed in advance. A typical signal: the counterparty knows details of the negotiations that have never been made public. And one thing must be said in advance — the tour is a snapshot in time. The space is only clean until someone enters it without supervision. First we will find out the real situation. Only then will we propose measures.
- Risk arises from a combination of space, technology, habits and mode of action — not a single box.
- Warning signal: the other party knows non-public details, information has leaked from a narrow circle, objects in the room have changed position.
- A tour is a snapshot in time — it must be followed by an access regime, otherwise the cleanliness of the space will not last.
- A predictable schedule of checks bodes well for the attacker; we repeat them at irregular intervals.
Scope
What the product is — and what it isn't.
Includes
- Meeting rooms and management offices
- Vehicles — GPS locators, onboard connectors, service windows
- Residence and private premises of the client
- Conference technology, cabling and wiring in the space
- Live spectrum monitoring during a sensitive meeting
Does not include
- We do not monitor third parties or their premises
- We don't eavesdrop — we execute only detection
- We do not access private or police records
- We do not guarantee zero risk; we will describe the residual risk
Procedure
First the reality. Then measures.
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01
Preliminary profile
Preliminary profile
We map out leak scenarios, who had access to the information, access to the space and service windows — even before arrival.
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02
Physical control
Physical and thermal inspection
We go through walls, ceilings, furniture and wiring; thermal imaging reveals heat traces of powered electronics, optical detection of hidden cameras.
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03
Electronic detection
Electronic and network detection
We analyze the RF spectrum including encrypted and GSM/LTE transmissions, with a non-linear detector (NLJD) we also search for switched-off devices, we check the wiring and Wi-Fi.
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04
Message and mode
Message and mode
We will pass on the finding report with spectrum recording and photo documentation and set a mode that will keep the space clean.
Coverage
We do not base the control on one device. We layer spectrum analysis, non-linear detection, thermal imaging, line inspection and physical inspection — and record every finding.
Radio spectrum
Analysis of the RF spectrum: active transmissions, anomalies, encrypted broadcasts and bugs abusing GSM/LTE networks with virtually unlimited range.
Equipment and management
Telephones, conference technology, cabling, sockets and power supplies — including wiretapping detection on telephone and data lines.
Network and connectivity
Wi-Fi, Bluetooth, and connected devices that can leak audio or data outside — leak control via wireless and IoT elements (Cyber TSCM).
Vehicles
GPS locators, on-board connectors and interior — sensitive calls while driving and service or parking windows are opportunities for installation.
Mode and habits
How things are done in the space, who has access, how meetings are arranged — and what will keep the space clean even after our inspection.
Output for management
Discovery report
A written document for management, delivered personally and securely.
What the document contains
- What was checked, by what methods and in what layers
- Findings with degree of certainty, photo documentation and context
- RF spectrum recording as the default state for the next check
- Recommendations sorted by priority and a draft regime for future negotiations
- What we deliberately did not address and why
We describe detected status and recommendations, not threats. We only forward the message to authorized persons.
Role and mode
Who decides and how we cooperate.
- 01
Head of background checks
Single point of contact for the client, manages the team and is responsible for the output.
- 02
Detection technician
Performs physical, spectral, non-linear and network inspection according to the agreed scope.
- 03
Guarantee of discretion
It monitors the handling of information and the safe transmission of messages.
Operational log
- A one-time inspection, or repeated inspections at irregular intervals — regularity indicates an attacker.
- On-demand activation — typically right before a key meeting, with the possibility of live monitoring of the spectrum during it.
- The finding is followed by verification of the effectiveness of the measure; in case of permanent risk, the design of a regime room or shielding.
- We always send messages in writing and in person, only to authorized persons.
- Form
- One-time inspection before the meeting, continuous mode with checks at irregular intervals, or live monitoring of the spectrum during the meeting itself.
- Timing
- We plan the tour just before a sensitive meeting; until it starts, we keep the area under access control.
- Scope
- We define according to the scenarios and real risks of the area, not a flat rate. We will also say what you don't need.
- Connection
- We work with a minimum of insiders on the client side; there is no one to learn about the cooperation.
Discretion
There is no one to learn about cooperation with us. We work on the principle need-to-know — information is known only to those who absolutely need it for their role. Dates, outputs i the very existence of the background check we keep a low profile. We deliver the discovery report personally and store it securely. Discretion has its legal limits and we respect them — we do not promise absolute coverage.
- Nondisclosure Agreement (NDA) as standard
- Need-to-know: a minimum of insiders
- Secure storage and personal message delivery
- Low-profile arrival and control process
Standards and the law
Trusted capacity, within the limits of the law.
- Proven and permanent team with a proven professional background
- Competence in RF spectrum analysis, non-linear detection, thermal imaging and network control
- Calibrated detection technique controlled by an experienced technician
- Each conclusion can be substantiated by spectrum recording and photo documentation
- Work within the framework of the relevant authorizations and the law
We work exclusively defensively and within the limits of the law. We perform intercept detection and protection — we never intercept or acquire third-party data ourselves. We do not install or sell wiretapping equipment. We do not monitor third parties, do not access non-public registers and handle data according to GDPR. Active wiretapping is reserved for law enforcement authorities.
Proof system
Specifically, but discreetly.
A service detail should not end with a promise. It shows an anonymized scenario, methodology and output that management will really use.
We do not show the client. We show the decision.
- 01 A find. Which is really weak.
- 02 Procedure. Who decides and when.
- 03 Output. Discovery report
Deliverable preview
Discovery report
- What was checked, by what methods and in what layers
- Findings with degree of certainty, photo documentation and context
- RF spectrum recording as the default state for the next check
Part of the GBH group
GBH Partners
Ensuring sensitive meetings and trips outside the usual areas.
GBH Capital
Investment division of the security infrastructure financing group.
GBH Cyber
The digital plane of information leakage — devices, networks, communications.
GBH Bunker
Control room or shielding if risk of eavesdropping persists.
GBH Academy
Training rules for sensitive negotiations and handling of information.
Related services
All services
Information protection
Protection against industrial and commercial espionage
classification of information
closed escape routes
situational OPSEC rules
Advisory
Security consulting
monthly risk brief
monitoring exposure changes
prioritized by impact
Digital resilience
Cyber and data resilience
digital footprint map
incident response (IR) plan
priorities for management
Questions for decision
Is technical monitoring for wiretapping legal?
Yes. We perform defensive detection in our own or client premises, within the framework of the relevant authorizations and the law. We never eavesdrop ourselves — active eavesdropping is reserved for law enforcement. We do not track third parties.
Will anyone find out that you checked with us?
We work in a low profile and on a need-to-know basis. Only a necessary circle of people knows the date and the outcome, we deliver the message personally. Discretion has legal limits that we respect — we don't promise absolute coverage, but we keep cooperation quiet.
Can you find a device that is not currently broadcasting?
The tour is layered for that. Switched off and passive devices — typically mini voice recorders — will not be picked up by spectrum analysis; we look for them with a non-linear transition detector (NLJD) that reacts to semiconductors, thermal imaging and physical inspection. Devices activated only during the meeting deal with live surveillance of the spectrum during its course.
When does it make sense to contact us?
Before a key meeting, acquisition, dispute or personnel change. After suspicion arises — when the other party knows non-public details or information has leaked from a narrow circle. And as a precaution: regular inspections of sensitive areas belong to the care of trade secrets and information security management in the logic of ISO/IEC 27001.
How is the scope and price determined?
We build the scope on scenarios and real risks of the area, not on a flat rate basis. First we find out the real situation, then we only recommend what makes sense — and we'll tell you what you don't need. The price depends on the agreed range.
What happens when you find something?
We will describe the find in writing, with a degree of certainty, with photo documentation and context, and discuss with you the next step — from securing evidence to possibly handing the matter over to the authorities. In the event of repeated findings, we will propose permanent measures, for example a regime room. We don't decide for you; we will give you the basis for your decision.
The first interview is non-binding and discreet
"Describe the situation in a secure channel. Together we will determine whether and to what extent technical control makes sense. We will not scaremonger — we will describe the likely scenarios and their impact."
Tomáš Šlesinger · GBH Group Security Advisor
Contact us
The first step doesn't have to be big. It must be correct.
First contact protocol
First we understand the situation. Then we suggest the next step.
Briefly write what you are dealing with. We will contact you discreetly and arrange a safe call format.
Call safely