Network-Based Attacks: How to Safeguard Your Digital and Crypto Assets from Hackers
- Last Updated: October 4, 2026
Network-based attacks pose significant threats to cryptocurrency security. They leverage vulnerabilities in wireless and internet connections to intercept or manipulate sensitive data.
Key examples are Man-in-the-Middle (MitM) attacks and Wi-Fi sniffing.
Both attacks exploit unsecured or poorly protected networks, particularly public Wi-Fi, to steal information such as login credentials and private keys, resulting in potentially irrecoverable financial losses.
However, there is a key difference between them:
In a Man-in-the-Middle (MitM) attack, the hacker actively positions themselves between the user and the intended service (such as an exchange or wallet provider) and may not only intercept but also manipulate the data, potentially altering transaction details or redirect funds.
This makes MitM attacks both intrusive and manipulative, as the attacker can directly interfere with the communication.
Wi-Fi sniffing, on the other hand, is primarily a passive form of attack. Here, the hacker captures data packets transmitted over an unsecured network, such as public Wi-Fi, without necessarily manipulating or altering the information.
Instead, they rely on extract valuable data from intercepted packets, like passwords or private keys, which they can later use to access the victim’s accounts.
By understanding these differences, users can better recognize and safeguard against both forms of network-based threats in cryptocurrency environments.
This blog post features a chapter from the book,
How To Keep Your Crypto And Digital Assets Safe From Hackers.
Find more chapters and information about the book here.
Table of Contents
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What is a Man-in-the-Middle (MitM) Attack?
Man-in-the-Middle (MitM) attacks are a dangerous form of cyberattack in which hackers secretly intercept communication between two parties—such as a cryptocurrency user and an exchange or wallet provider—without either party being aware.
These attacks allow hackers to eavesdrop, steal login credentials, or even manipulate transactions to reroute cryptocurrency into their accounts.
Given the irreversible nature of cryptocurrency transactions, falling victim to a MitM attack can result in significant financial loss, often with no way to recover stolen assets.
MitM attacks occur when a hacker positions themselves between two communicating parties, intercepting data exchanges between the user and a website, exchange, or wallet service.
The most common method for executing these attacks is through unsecured internet connections, especially public Wi-Fi networks.
Warning: EVERY TIME you use public wi-fi, you are incurring a very high risk of being hacked
Once hackers control the communication channel, they can capture sensitive information, such as passwords, or two-factor authentication (2FA) codes.
They can also modify transaction details, sending crypto assets to their own wallet instead of the intended recipient, resulting in significant financial consequences.
How Man-in-the-Middle (MitM) Attacks Work
A typical MitM attack unfolds as follows:
1. Connection Interception:
The hacker intercepts a user’s connection, usually by exploiting weaknesses in public Wi-Fi networks.
They may set up their rogue Wi-Fi hotspot or take advantage of an unsecured network to position themselves between the user and the website or service they are trying to access.
2. Traffic Monitoring:
Once in position, the hacker monitors all data transmitted between the user and the service.
This can include login credentials, transaction details, or sensitive information related to the user’s cryptocurrency accounts.
3. Data Alteration:
Sometimes, the hacker doesn’t just passively monitor the traffic; they can also modify it.
For example, if a user sends cryptocurrency to an exchange or wallet, the hacker could alter the receiving address to their own, stealing the transaction without the user realizing it.
4. Stealing Data:
The hacker captures sensitive data such as passwords, or 2FA codes, which can then be used to access the victim’s accounts, empty wallets or alter transactions to divert funds.
Common Forms of Man-in-the-Middle Attacks in Crypto
Man-in-the-Middle attacks come in different forms, each leveraging different vulnerabilities. Here are the most common types that target cryptocurrency users:
Wi-Fi Eavesdropping
Public Wi-Fi eavesdropping occurs when attackers intercept data transmitted over public or unsecured Wi-Fi networks.
Deployment Methods:
- Unsecured Public Wi-Fi Networks: Hackers position themselves within the range of an open Wi-Fi network and use packet-sniffing tools to capture user data.
- Rogue Wi-Fi Hotspots: Attackers set up fake Wi-Fi networks with names resembling legitimate ones (e.g., “CoffeeShop_WiFi_Free”) to trick users into connecting.
Impact: Once connected, attackers can monitor all traffic and capture passwords, private keys, and other sensitive details as they are sent over the network.
Session Hijacking
In a session hijacking attack, the attacker steals a user’s session token or cookie, enabling unauthorized access to their account.
Deployment Methods:
- Intercepting HTTP Traffic: Using network monitoring tools, attackers intercept unencrypted traffic to capture session cookies.
- Malicious Browser Extensions: Extensions with hidden scripts can steal session data once the user logs in.
Impact: The stolen session token allows the attacker to impersonate the user and access their account without credentials. This can lead to unauthorized transactions or data theft.
SSL Stripping
SSL (Secure Sockets Layer) stripping downgrades a secure HTTPS connection to an insecure HTTP connection, enabling attackers to read transmitted data.
Deployment Methods:
- Intermediary Proxy Servers: Hackers position a proxy between the victim and a website, relaying traffic and forcing the connection to downgrade.
- Compromised Routers: Attackers alter router settings to redirect traffic through their malicious server, where SSL stripping can occur.
Warning: Public Wi-Fi networks can never be guaranteed secure. You have no way of knowing who set up the network or their level of expertise. A seemingly safe network may be poorly configured or compromised, leaving your data vulnerable to interception.
Impact: This allows attackers to intercept sensitive data, such as login credentials and private keys, during transmission.
DNS Spoofing
DNS (Domain Name System) spoofing involves altering DNS records or responses to trick users into visiting fake websites instead of legitimate ones.
Deployment Methods:
- Compromising DNS Servers: Hackers modify DNS server entries to redirect users to malicious sites.
- Cache Poisoning: Attackers inject false data into the DNS cache, misleading users to fraudulent websites when they enter a legitimate URL.
Impact: Victims believe they are on a real site (e.g., a cryptocurrency exchange), but they are on a fraudulent one designed to steal their login information.
Note: For a comprehensive overview of protecting yourself from DNS-related threats, see Appendix:
Understanding and Preventing DNS Spoofing.
This appendix covers techniques to mitigate DNS spoofing, including secure DNS settings, HTTPS verification, DNS encryption, and regular DNS cache clearing.
These strategies ensure secure connections and prevent attackers from redirecting you to fraudulent sites.
What is Wi-Fi Sniffing?
Wi-Fi sniffing is a dangerous cyberattack where hackers intercept and monitor data transmitted over wireless networks, especially unsecured public Wi-Fi.
In cryptocurrency, attackers can capture sensitive data, such as login credentials, or transaction details, as users access wallet providers or exchanges.
Given the irreversible nature of cryptocurrency transactions, falling victim to Wi-Fi sniffing can result in substantial financial loss, often with no way to recover stolen assets.
Wi-Fi sniffing occurs when a hacker connects to the same network as the victim and uses specialized tools to capture data packets.
Public Wi-Fi networks—particularly those lacking secure encryption—are the most common targets, as they allow easy access to unencrypted data between devices and the network.
Warning: Do NOT use public wi-fi unless there is an emergency and you have not any other alternative. It is not worth the risk!
Once attackers control the communication channel, they can capture sensitive information such as passwords, private keys, or two-factor authentication (2FA) codes.
In some cases, they may use this information to access the victim’s accounts directly, transferring cryptocurrency assets to their wallets and leaving the victim with no means of recovery.
How Wi-Fi Sniffing Attacks Work
A typical Wi-Fi sniffing attack unfolds as follows:
1. Network Access:
The attacker connects to the same public Wi-Fi network as the target user.
Hackers do not need special permissions on public networks, which often lack encryption, to monitor network traffic.
2. Data Packet Interception:
Once connected, the attacker uses packet-sniffing software (like Wireshark) to capture all data packets transmitted over the network.
These packets contain information sent between the user and any websites, exchanges, wallets, or other services accessed.
3. Data Analysis:
The attacker analyzes the captured packets, extracting sensitive data like login credentials, private keys, and transaction information.
When this data is not encrypted, the hacker can easily access it in plain text.
4. Account Compromise:
With the extracted credentials or private keys, the hacker can log into the victim’s accounts, transfer funds, or alter account settings to lock out the legitimate user, resulting in severe financial losses.
Common Methods Used in Wi-Fi Sniffing Attacks
Wi-Fi sniffing attacks utilize various techniques, each taking advantage of different weaknesses in network security.
The most common forms are:
Unsecured Public Wi-Fi Networks
Public Wi-Fi networks lacking robust encryption are prime targets for Wi-Fi sniffing attacks. Even networks secured with older protocols like WEP (Wired Equivalent Privacy) or poorly configured WPA (Wi-Fi Protected Access) can be compromised.
Deployment Methods:
- Packet Sniffing Tools: Attackers use tools like Wireshark to monitor and capture data packets transmitted over unsecured networks.
- Man-in-the-Middle (MitM) Setup: Hackers position themselves between the user’s device and the Wi-Fi router, intercepting all data exchanged.
Impact: Attackers can intercept and steal sensitive data such as wallet logins, and authentication tokens.
Evil Twin Networks
An Evil Twin network is a rogue Wi-Fi access point set up to mimic a legitimate network, tricking users into connecting.
Deployment Methods:
- Cloning Public Network Names (SSID): Hackers create Wi-Fi networks with names that closely resemble legitimate ones (e.g., “Coffee_Shop_WiFi_Free”).
- Stronger Signal Strength: The rogue network is set up with a stronger signal than the original to attract more users.
Impact: Once connected, all transmitted data—such as cryptocurrency transactions, login details, and wallet interactions—can be monitored and captured by the attacker without the user’s knowledge.
How to Spot Network-Based Attacks
Network-based attacks, such as Man-in-the-Middle (MitM) and Wi-Fi sniffing, can be difficult to detect due to their stealthy nature.
However, being aware of certain signs and behaviors can help you identify potential risks before they escalate.
Here’s a guide to spotting these types of attacks, which often share similar indicators:
1. Look for Unsecured Connections
A critical indicator of both MitM and Wi-Fi sniffing attacks is the absence of a secure connection on websites you’re accessing. Always ensure the following:
- Check for HTTPS: Look for “HTTPS” in the website’s URL and a padlock icon in your browser’s address bar. Sites with “HTTP” (without the “S”) lack encryption, making it easier for attackers to intercept data. HTTPS protects the connection, not your choice of site: a fake site can have a padlock too.
- Beware of SSL Certificate Warnings: If you receive a warning that a site’s SSL certificate is invalid, expired, or untrusted, this could be a sign that a MitM attack is trying to downgrade your connection to an insecure state, allowing the attacker to intercept your data.
2. Monitor for Suspicious Wi-Fi Networks
Public Wi-Fi networks are popular targets for both MitM and Wi-Fi sniffing attacks.
Be cautious when connecting to Wi-Fi, especially in public areas:
- Avoid Networks Without Passwords: Unsecured, open networks are easy targets for hackers looking to intercept unencrypted data. Avoid connecting to such networks for any sensitive activities, especially cryptocurrency transactions.
- Look for Duplicate Network Names: Attackers may set up “Evil Twin” networks that mimic legitimate ones. If you see two networks with similar names (e.g., “Free Coffee Wi-Fi” and “Free_Coffee_WiFi”), avoid connecting, as one may be a rogue network controlled by a hacker.
- Be Wary of Generic Network Names: Hackers often use names like “Free Wi-Fi” to attract unsuspecting users. Avoid connecting to networks with such generic names, especially if they appear unexpectedly.
3. Watch for Unusual Browser Behavior
Changes in your browser’s behavior can indicate an ongoing MitM or Wi-Fi sniffing attack. These could include:
- Unwanted Redirects: If you’re unexpectedly redirected to websites that look similar but have different URLs, this could signal a DNS spoofing MitM attack.
Attackers use this technique to redirect you from legitimate websites to fake ones where they can capture your login credentials.
- Unexpected Pop-Ups Asking for Login Details: MitM attackers may inject fake login pop-ups or requests to capture your credentials.
If a site unexpectedly prompts you to re-enter sensitive information, close the session and try accessing it from a secure, private network.
4. Notice Slower or Unstable Network Performance
A slower or unstable internet connection, especially when using public Wi-Fi, can sometimes indicate that an attacker is actively intercepting or manipulating your data:
- Slow Loading Times: If your internet connection is unusually slow on a public network, it may be due to increased network traffic from a MitM attack or Wi-Fi sniffing.
Hackers using packet-sniffing tools can cause the network to slow down as they capture and analyze data.
- Frequent Disconnections: Regular disconnections or intermittent connectivity issues could signal an attacker’s attempts to disrupt your session or force you to reconnect through their rogue network
5. Be Cautious of Unusual Account Activity
After connecting to a suspicious network, check for any unusual activity in your cryptocurrency or other sensitive accounts:
- Unexpected Logins: Some services notify you of new or unusual logins.
If you receive an alert of an unauthorized login after using public Wi-Fi, may be because an attacker captured your credentials through Wi-Fi sniffing or MitM attacks.
- Strange Transactions or Settings Changes: In cases where an attacker gains access to your accounts, they may alter settings, transfer funds, or initiate transactions.
Immediately verify account activity after using public Wi-Fi if you suspect an attack.
6. Pay Attention to Device Warnings and Security Alerts
Modern devices and security software often detect and alert users to potential MitM or Wi-Fi sniffing threats. Common indicators include:
- Firewall or Antivirus Warnings: Firewalls and security software may notify you of unusual network activity.
Heed these warnings, as they can signal attempts to intercept your data.
- VPN Alerts: Using a VPN may alert you to suspicious network activity or insecure connections.
Disconnect from any network that triggers a VPN security alert.
Best Practices for Preventing Network-Based Attacks
To protect yourself from network-based attacks, such as Man-in-the-Middle (MitM) attacks, DNS hijacking, and Wi-Fi sniffing, follow these essential best practices:
- Use a Virtual Private Network (VPN):
A VPN encrypts your internet traffic, making it more difficult for attackers to intercept data on unsecured networks like public Wi-Fi.
Use a reputable VPN whenever accessing cryptocurrency accounts or sensitive information, especially on shared or public networks.
- Enable Secure Browsing (HTTPS):
Always check that websites use HTTPS, particularly when logging into accounts or accessing financial platforms.
HTTPS ensures that your connection to the site is encrypted and helps protect against MitM attacks.
Note: For an in-depth guide on securing your online connections, including the use of SSL for encrypted communication, see Appendix:
How to Ensure Secure Connections Using SSL.
Recognizing HTTPS and using secure networks are critical in protecting against potential Man-in-the-Middle attacks, a common threat in digital spaces that can compromise sensitive information if left unaddressed.
3. Avoid Public Wi-Fi for Sensitive Transactions:
Attackers commonly target public Wi-Fi networks to intercept data.
Avoid conducting any financial transactions or accessing sensitive accounts on public networks.
Use a mobile data connection or a VPN to enhance security if necessary.
> Unsecured WiFi Networks | How To Secure Your Digital Assets <
4. Keep Your Router Secure:
Secure your home network by changing the default router password and enabling WPA3 or WPA2 encryption.
Regularly update your router’s firmware to protect against vulnerabilities that could allow unauthorized access to your network.
5. Regularly Update Your Device and Network Software:
Keep your device’s operating system, browser, and security software up-to-date.
Regular updates patch vulnerabilities that hackers might exploit in network-based attacks.
6. Slow Down and Think:
Hackers rely on inattentiveness and poor digital hygiene to exploit vulnerabilities. Network-based attacks often thrive when users overlook basic security precautions.
Always pause and assess your digital habits:
– Question the security of your current connection: Are you using public Wi-Fi for sensitive activities? If so, consider switching to mobile data or enabling a reputable VPN.
> Use a Virtual Private Network to Protect Your Data and Anonymity <
– Verify your home network’s safety: Have you updated your router’s firmware, changed default passwords, and enabled WPA3 or WPA2 encryption?
– Check for secure browsing indicators: Before entering sensitive information, confirm the presence of HTTPS and SSL certificates on websites.
– Stay mindful of updates: Regularly update your device’s operating system, browser, and security software to patch vulnerabilities.
How to Minimize the Impact of Network-Based Attacks
Even with precautions, network-based attacks can occur. Here are measures to minimize the impact if you fall victim to a network-based attack:
1. Use Hardware Wallets for Cold Storage:
Hardware wallets store private keys offline, immune to network-based attacks.
Funds kept in a hardware wallet remain secure even if your internet-connected device is compromised.
> How To Proactively Keep Your Crypto Hardware Wallet Safe <
> Most Durable Seed Phrase Storage – Stainless Steel Engraving <
2. Avoid Online Digital Storage for Sensitive Data:
Keep physical backups of sensitive information: Consider physical storage options rather than storing passwords, seed phrases, or private keys on internet-connected devices or cloud storage.
Use invisible ink for added protection: Write passwords or seed phrases using invisible ink on a notebook that can only be viewed under UV light.
> Invisible Ink: Enhanced Protection for Your Passwords and Secrets <
This adds a layer of security, ensuring that sensitive information is hidden from prying eyes and accessible only with the proper tools.
Store in a secure, offline location: Physical security is essential. Keep the notebook in a safe, locked space and inform only trusted individuals of its location.
3. Limit Access with Segmented Networks:
Use separate networks for different activities. For example, keep personal devices on one network and sensitive accounts on a separate, more secure network.
This approach limits potential exposure if a network is compromised:
- Assign personal devices, like phones and streaming gadgets, to one network.
- Reserve another, more secure network for sensitive activities, such as managing cryptocurrency accounts or accessing financial data.
Note: Set up a guest network for visitors and family members. This ensures that if someone connects and infected or compromised device, your primary network and sensitive accounts remain insulated from harm.
4. Enable Two-Factor Authentication (2FA) Using Hardware:
Hardware-based 2FA adds a physical security layer to your accounts.
Even if an attacker intercepts your login credentials, they will still need access to your hardware-based 2FA device to gain entry.
> Two-Factor Authentication (2FA) Vs Multi-Factor Authentication (MFA) <
5. Use Withdrawal Whitelists on Exchanges:
Many cryptocurrency exchanges offer a whitelist option, restricting withdrawals to pre-approved addresses.
If a network-based attack compromises your account, the whitelist can prevent funds from being withdrawn to unauthorized wallets.
6. Log Out After Each Session on Sensitive Accounts:
Always log out after accessing cryptocurrency accounts, especially on shared or public networks.
This prevents unauthorized access if someone gains access to your network.
> Burner Wallet: A Good Practice to Protect Your Crypto from Hacks <
Key Takeaway
Network-based attacks like Man-in-the-Middle (MitM) and Wi-Fi sniffing exploit vulnerabilities in your internet connections to intercept and steal sensitive data.
These attacks are especially dangerous for cryptocurrency users, as they can lead to irrecoverable financial losses.
By understanding how these attacks work and implementing proactive security measures, you can significantly reduce your risk.
Key Lessons from This Chapter:
1. Public Wi-Fi is inherently risky:
Avoid using unsecured networks for sensitive activities like accessing cryptocurrency accounts or making transactions.
2. Secure connections are critical:
Always ensure websites use HTTPS and consider using a reputable VPN to encrypt your traffic on any network.
3. Vigilance helps detect attacks:
Look for warning signs like duplicate Wi-Fi networks, unusual browser behavior, or SSL certificate errors.
4. Hardware wallets are essential:
Storing private keys offline keeps your funds secure, even if your network or device is compromised.
5. Enable advanced protections:
Use hardware-based 2FA and withdrawal whitelists to prevent unauthorized access and transactions.
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