Anonymity Networks


In this post, I’m going to solve the SpamLess challenge from UUTCTF2021. It is about sending an email without being spam to [email protected] address. The mail server is served as a Tor’s hidden service.

Now the writeup …

The Challenge

SpamLess Challenge

I’ve described the needed tools and methods for solving the question in the following video. You can check my previous post about fetching a hidden service’s public key which is needed for solving this challenge.

SpamLess WriteUp – UUTCTF2021

If you have any question, you can reach me by email.

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Onion Tunnel

Onion Tunnel

Onion Tunnel is a simple tunnel app for tunneling every connection through TOR network. It is in my GitHub repository named OnionTunnel:

The idea of Onion Tunnel is taken from I2P. It opens a port on localhost for each Hidden Service but TOR does not have such thing. Instead, it opens a SOCKS5 Proxy to tunnel every connection through TOR.

This idea is great but it has a problem:

What if the application that wants to get traffic from TOR, does not support SOCKS5 proxy?

Continue reading Onion Tunnel: Proxy Every TOR Hidden Service on localhost
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