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32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
---
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tags: ["kovri"]
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terms: ["NTCP"]
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summary: "NIO-Based TCP (Non-blocking I/O based TCP): one of two Kovri transports"
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---
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### The Basics
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*NIO-Based TCP (Non-blocking I/O based TCP)* is one of two encrypted @transports for @Kovri.
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Similar to @SSU, @NTCP's *primary* purpose is to securely transmit @in-net @I2NP messages through @tunnels but, unlike @SSU, @NTCP functions solely over encrypted [TCP](https://en.wikipedia.org/wiki/Transmission_Control_Protocol).
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### In-depth information
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- Passes along individual @I2NP messages (both Standard and Time Sync) after:
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- TCP has been established
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- Establishment Sequence has been completed
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- Uses the following @encryption:
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- 2048-bit [Diffie-Hellman](https://en.wikipedia.org/wiki/Diffie-hellman)
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- [AES-256](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard)/[CBC](https://en.wikipedia.org/wiki/Block_cipher_modes_of_operation)
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- Establishment Sequence has the following *states*:
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- Pre-establishment
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- Establishment
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- Post-establishment or "Established"
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- Uses the following from the @network-database:
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- Transport name: NTCP
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- Host: IP (IPv4 or IPv6) or host name (shortened IPv6 address (with "::") is allowed)
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- Port: 1024 - 65535
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### Notes
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For further details, read @Java-I2P's [NTCP](https://geti2p.net/en/docs/transport/ntcp)
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