Centre for Police Technology (CPT) presents a 31-Day Cybersecurity Knowledge Series for police personnel, law enforcement agencies (LEAs), corporate investigators, digital forensics professionals and cybersecurity practitioners.
October 19, 2026 | Day 19 of 31
Behind the familiar websites, search engines and social media platforms lies another part of the internet where identities can be difficult to establish, websites may operate anonymously and illegal marketplaces can trade in stolen data, illicit goods and cybercrime services.
This environment is often associated with criminal activity, but the dark web also has legitimate uses, including privacy protection and communication under censorship. For investigators, the challenge is to distinguish lawful activity from genuine threats and turn concealed online activity into reliable evidence.
Dark web investigations combine digital forensics, open-source intelligence, cryptocurrency tracing and traditional investigative methods to identify suspects, investigate illicit activity and connect online evidence with real-world offences.
What Is the Dark Web?
The internet is commonly described in three broad layers.
- Surface Web: Publicly accessible websites that search engines can generally index, such as news websites and public blogs.
- Deep Web: Content not generally indexed by search engines, including private email accounts, online banking portals, subscription databases and password-protected systems. Much of it is entirely legitimate.
- Dark Web: A part of the internet that requires specialised software, configurations or authorisation to access. Some services are designed to conceal the location of their servers and make identifying their operators more difficult.
The Tor network is one technology used to access certain dark-web services. It can support legitimate privacy and anti-censorship purposes, but it can also be misused to host illegal marketplaces and conceal criminal activity.
Using the dark web is not, by itself, proof of a crime. Investigators must establish the specific conduct, applicable law and evidence relevant to each case.
What Activities Can Investigators Encounter?
Dark-web investigations may involve a range of activities, including:
- Stolen Data Trading: Criminals may advertise stolen credentials, personal information, financial data or records obtained through data breaches.
- Cybercrime-as-a-Service: Some actors offer malicious tools, compromised account access, phishing kits or other services intended to facilitate cyberattacks.
- Ransomware Operations: Criminal groups may use hidden services to publish stolen information, communicate with victims or coordinate extortion.
- Illegal Marketplaces: Certain marketplaces facilitate prohibited transactions, although their existence and activity can change rapidly.
- Fraud and Identity Theft: Stolen identities and account information may be advertised or exchanged for fraudulent use.
- Extortion and Threats: Criminals may use anonymous communication channels to threaten victims, demand payments or distribute stolen information.
Investigators must verify whether a listing, claim or advertised service is genuine. Some dark-web content is fraudulent, exaggerated, outdated or deliberately designed to deceive buyers, competitors or law enforcement.
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How Do Criminals Exploit the Dark Web?
The dark web can provide criminals with tools and communication channels that complicate identification and investigation.
Anonymous Marketplaces: Criminals may use concealed services to advertise illicit goods, stolen information or prohibited services while attempting to hide their identities.
Sale of Stolen Credentials: Compromised usernames, passwords and session information may be traded and later used to take over accounts or access organisational systems.
Ransomware and Data Extortion: Attackers may use hidden websites to publish stolen files, pressure victims and communicate payment demands.
Recruitment and Collaboration: Criminal networks may use private forums or encrypted communication channels to exchange techniques, recruit collaborators or coordinate activity.
Cryptocurrency Payments: Some illegal transactions involve digital assets, creating a need to trace blockchain activity and examine links to exchanges or other services.
Fraudulent Services: Criminals may advertise fake hacking, data-recovery or cybercrime services to defraud other criminals or unsuspecting customers.
Although these methods can complicate attribution, they do not guarantee anonymity. Operational mistakes, reused usernames, payment records, seized devices and other evidence may help investigators identify leads.
How Can Police and LEAs Investigate the Dark Web?
Dark-web investigations require careful planning, technical expertise, lawful evidence collection and coordination across agencies.
1. Identify Relevant Online Activity: Investigators may examine lawfully accessible forums, marketplace listings, public threat claims and other relevant material to identify possible links to a reported offence.
2. Preserve Digital Evidence: Relevant pages, timestamps, account identifiers, communications and transaction references should be documented promptly. Investigators should record how evidence was obtained and preserve original files where possible.
3. Correlate Online Identities: Usernames, writing patterns, reused contact details and other indicators may help generate links between accounts. These are investigative leads, not conclusive proof of a person’s identity.
4. Trace Cryptocurrency Transactions: Where digital assets are involved, blockchain analysis may help map fund movements and identify transactions involving known services. Blockchain findings should be corroborated with other records.
5. Examine Seized Devices: Forensic examination of computers, phones and storage devices may reveal browser artefacts, communications, wallet applications, files or other evidence relevant to the investigation.
6. Connect Digital Activity to Real-World Evidence: Investigators can compare online findings with victim statements, financial records, IP-related evidence, service-provider records and other legally obtained information.
7. Coordinate Across Jurisdictions: Dark-web services, suspects, victims and hosting infrastructure may span several countries. Investigations may require formal legal assistance, international cooperation and coordination with relevant service providers.
Investigators should use approved tools and procedures, avoid altering potential evidence and maintain a documented chain of custody. They must also consider the possibility of fabricated identities, manipulated listings, shared accounts and misleading information.
How Can Ordinary People Protect Themselves?
You do not need to access the dark web to be affected by activity that occurs there. Stolen passwords or personal information may be used in ordinary online fraud and account attacks.
- Use Unique Passwords: Use a different, strong password for each important account and consider a reputable password manager.
- Enable Multifactor Authentication: Add an extra layer of protection to email, banking, social media and work accounts.
- Recognise Data-Breach Warnings: If a service reports a breach, change affected passwords and any reused passwords immediately.
- Watch for Phishing: Be cautious of unexpected messages, suspicious attachments, urgent payment requests and links asking you to verify credentials.
- Monitor Financial Accounts: Review bank and payment activity regularly and contact your bank promptly if you notice unauthorised transactions.
- Avoid Illegal or Suspicious Services: Do not buy stolen data, attempt to hire hackers or share personal information with anonymous vendors.
- Report Cybercrime: In India, report suspected cybercrime at cybercrime.gov.in. If you suspect cyber financial fraud, call 1930 as soon as possible.
If you discover that your information is being advertised online, preserve relevant URLs and screenshots without engaging with the seller. Report the incident to the affected service provider and appropriate authorities.
How Can Organisations Strengthen Their Defences?
Organisations should treat dark-web threat intelligence as one input into a broader cybersecurity programme. Monitoring may help identify exposed credentials, leaked internal documents, impersonation attempts or threats involving the organisation.
Effective measures include enforcing multifactor authentication, monitoring for exposed credentials, patching vulnerable systems, maintaining tested backups and preparing incident-response procedures. Organisations should verify threat-intelligence findings before taking action and avoid assuming that every online claim is authentic.
Security teams should also coordinate with legal, privacy and law enforcement specialists when handling potentially stolen personal information or evidence of criminal activity.
The Future of Dark Web Investigations
Dark-web investigations continue to evolve alongside encryption, privacy technologies, cryptocurrency, automated marketplaces and artificial intelligence. AI may help investigators organise large volumes of multilingual content and identify patterns, but it can also help criminals generate convincing scams, fake identities and misleading information.
Successful investigations will depend on combining technical tools with human intelligence, digital forensics, financial analysis, lawful investigative powers and international cooperation.
The dark web may conceal identities, but it does not make every digital trace disappear. The task for investigators is to follow the evidence, verify every connection and establish what can be proved.
Day 19 — Dark Web Investigations
31 Days | 31 Key Topics | October 2026
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