SIN - Safety In Numbers

SIN is a program made by me to battle draconian anti-piracy plans that threaten to disrupt free-speech and freedom of information. Basically SIN is a file server and client in one compact executable. SIN combines 4096 bit RSA and 256 bit aes-rijndael to form a very strong hybrid cryptosystem so that even governments and security agencies can't break your encryption in the next 50isch years or so.

For comparison: 1024 bit RSA is considered secure for the next 10 years and SIN uses keys four times as large. Aes rijndael is used by the US government's messages with top secret classification. Some have said that it would take 149 trillion years to brute force Rijndael

Warning: SIN is designed to ensure safe file transfer, it's not meant to keep the files themselves safe. This means that while an agency or government cannot decrypt data captured on line, they can simply connect to your server and download the files themselves. You'll want to share files that are encrypted before they are stored in the Shares folder. Truecrypt and Winrar could do this for you.

Why not just encrypt it and store it on a http fileserver instead?

There are two reasons, the first being that if a file -encrypted or not- is found to 'violate' intellectual property 'laws' it's often taken down immediately. This means that you will not be able to recover it once it's found to be violating some law or another. It's even worse when the site (this happened to various filesharing sites) has to chose between releasing personal details -like your ip address- or face a lawsuit. Even if they have nice privacy policies you should bear in mind that these mostly involve you and that the site itself can violate them in any way they see fit.

Secondly because a file, no matter how many times it's transported, always looks different when using SIN. This is because SIN uses a Onetimekey used only for the current connection. Even If they suspect you're downloading a copyrighted file they cannot prove you did. Because the file will look different every time it's downloaded.

tl/dr: Use SIN it's better then http filesharing.

The program expects two arguments:

The program will create three new folders the first time it is ran, one is named Imports and the other two are named Shares and OneTimeKeys. In shares you'll put all files you want to share with other people when they connect to your server. In imports all the files you download will be saved. If you run the server (SIN s) a file named 'shared' will also appear. DO NOT MOVE, COPY OR EXPOSE THIS FILE TO ANYONE! if this file is exposed all your data can be decrypted beating the point of the whole program. Just keep it exactly where it's at and everything will work as it should.

SIN.exe - Jotti's malware scan
https://www.virustotal.com/file/b235...is/1328263270/

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Commands:

Client commands:

g -> gets all files in the server shares folder
d -> Download a singe file
e -> Exit

Server commands: None

-SCHiM

Very good job

Will it cause a major speed decrease?

What if it is a huge file, like a os image on 3 gb?

What i meant was you said you load the file to the memory before sending it. What if a 3 gb file is loaded to the memory?

2 weeks later, still waiting for above post's answer ^^'

I guess I'll try to contact schim myself at this point and ask him if he uses a file-cache already to avoid large files using all the computer's memory for large file encryption.

Yes, please post the code would be great.