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Re: [tor-talk] New Software: P2P filesharing designed to use Tor
Hi,
a link goes like this: sdc://|file|sampletextfile.txt|76|5508A134D3CF3F7F01518FDEFE5E1C60B04E8A65|/
sampletextfile.txt -> filename,
76 -> filesize
5508A134D3CF3F7F01518FDEFE5E1C60B04E8A65 -> roothash
Hashing is done in a tree-style like tiger but a little different with 3 levels of hash:
Level 0: roothash
Level 1: intermediate hash (nests up to 100 nodes ( Level 2)
Level 2: hashes 100 kb blocks
Hashing is using SHA-1.
The higher level hash is composed of the hashes of the lower level.
Exception roothash: root-hash is computed by hashing all Level-1 hashes plus appending the filesize.
With this way the filesize is "fixed" and cannot be tricked by malware.
If you give someone a download container you pass over a file which has ascii-content (json), the content looks like:
{"name":"Demo Container","files":[{"relativePath":"2014-01-08 15.52.12.jpg","rootHash":"2950185AC96CCC33F5428A046CAF64BE0D7D2662","fileSize":628079}]}
-----Original Message-----
From: "SecTech" [tech@xxxxxxxxxxx]
Date: 01/06/2015 01:43 PM
To: tor-talk@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [tor-talk] New Software: P2P filesharing designed to use Tor
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Hash: SHA512
Hi,
if I give someone a link to a file, are there hash in the link?
how does hashing work in your program and which hashes do it use?
Is your program computing an hash per file or several hashes / macs per
part of an file like torrent with tiger tree hash?
- --
SecTech <tech@xxxxxxxxxxx>
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