Reducing the number of intermediary nodes (also known as "relays" or "hops") in the Tor network to a single one is not recommended and not supported by default in the standard Tor configuration. The Tor network is designed with three relays (guard, middle, and exit nodes) to provide strong anonymity and security. Reducing this to a single relay would severely compromise your privacy and security.

Why Tor Uses Three Relays

1. Guard Node: The first relay, which builds a long-term relationship with your client to protect against adversaries who might try to deanonymize you by observing network patterns.
2. Middle Node: The second relay, which adds another layer of obfuscation.
3. Exit Node: The final relay, which connects to the destination server on your behalf.

This design ensures that no single relay knows both your IP address and the destination server, making it difficult for adversaries to trace your activity.

How to Reduce Tor to a Single Relay (Not Recommended)

If you absolutely must reduce the number of relays (e.g., for testing or experimental purposes), you can configure Tor to use a single relay by modifying the torrc configuration file. However, this will break anonymity and expose your traffic to the relay operator.

Steps:

1. Edit the torrc file:

   • Locate the torrc file (usually in /etc/tor/torrc on Linux or in the Tor Browser's configuration directory).
   • Add or modify the following lines:
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     UseEntryGuards 0
     NumEntryGuards 1
     StrictNodes 1

   • To force Tor to use a single relay, you can also specify a custom path using the Path directive, but this is complex and not recommended.

2. Specify a Single Relay:

   • You can manually specify a single relay by adding:
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     EntryNodes <relay-fingerprint>
     MiddleNodes <relay-fingerprint>
     ExitNodes <relay-fingerprint>

   • Replace <relay-fingerprint> with the fingerprint of the relay you want to use. You can find relay fingerprints on Tor Metrics or Globe.

3. Restart Tor:

   • Save the torrc file and restart the Tor service or Tor Browser.

Risks of Using a Single Relay

• No Anonymity: The single relay will know both your IP address and the destination server, making it trivial to deanonymize you.
• Traffic Exposure: All your traffic will pass through a single point, which could be malicious or compromised.
• No Protection: You lose the layered encryption and obfuscation provided by the standard three-relay design.

Alternatives for Testing

If you're experimenting or testing, consider:

• Using local Tor networks (e.g., Chutney) to simulate Tor with custom configurations.
• Using Tor's TestSocks or TestNetwork options for controlled testing.