dammit - I practically guessed the model from the fact he said it was encoded not encrypted.
I hate being sick. Can't code challenges :/
Topic: Game: First person to crack this gets 5 BTC [SOLVED] (Read 2521 times)
Grats! Nice puzzle 
Dang, I was just starting to think about different bit encodings, don't know if I would have gotten it that quickly though. Good job, and looking forward to another round!
Cool to see the code from mb300sd too, btw, thanks.
Cool to see the code from mb300sd too, btw, thanks.
Congratulations, I didn't think anyone would figure it out that fast. 
I'll post another one of these later today or tomorrow.
Here was my original encoding code:
I'll post another one of these later today or tomorrow.
Here was my original encoding code:
Code:
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
/*
Address: 1FezVeQ2unSiCbKwP9UArahNoMwaprCAyJ
Privkey: 5JWLNT79k1Ao4yk1j9fj5zQNRuEVrpUi4hsn2v8oFNfTjPM8Wqf
*/
String key = "5JWLNT79k1Ao4yk1j9fj5zQNRuEVrpUi4hsn2v8oFNfTjPM8Wqf";
String inc = "";
for (int i = 0; i < key.Length; i++)
{
inc += (char)((byte)key[i] + 1);
}
key = inc;
inc = "";
byte[] bytes = Encoding.ASCII.GetBytes(key);
BitArray bits = new BitArray(bytes);
int bit7len = (bits.Length / 8) * 7;
while (bit7len % 8 != 0)
{
bit7len++;
}
BitArray bit7 = new BitArray(bit7len);
int j = 0;
int k = 0;
foreach (bool bit in bits)
{
if (j != 7)
{
bit7[k] = bit;
k++;
}
j++;
if (j == 8) j = 0;
}
byte[] ret = new byte[bit7.Length / 8];
bit7.CopyTo(ret, 0);
Console.WriteLine(Convert.ToBase64String(ret));
Console.ReadLine();
}
}
}
Very nice. The base64 looked pretty obvious to me also that is why I considered myself 1/3 the way there. Didn't see the ascii thing. Well played.
The base64-decoded string was too long to be a binary key and too short to be a base58-enkoded key. I had the idea that it somehow involved 7 bit ascii values. That yielded a key starting with 6 and that contained colons ...
Looks like the coins are out already LOL.
Is that ( 1QE6bWhqizxUVuq55GjL1SErVKH9YCHb7e ) your address ?
Yes.
I updated the last post with an explanation.
Looks like the coins are out already LOL.
Is that ( 1QE6bWhqizxUVuq55GjL1SErVKH9YCHb7e ) your address ?
I updated the last post with an explanation.
Looks like the coins are out already LOL.
Is that ( 1QE6bWhqizxUVuq55GjL1SErVKH9YCHb7e ) your address ?
Wow. How the hell did you figure that out?
I updated the last post with an explanation.
Gratz. Can you explain how?
It's obviously base64-encoded now. Decoding that, and then encoding in base58 gave me something that began with a 5, which looked like a private key wallet import format, but it was too long…
It's obviously base64-encoded now. Decoding that, and then encoding in base58 gave me something that began with a 5, which looked like a private key wallet import format, but it was too long…
Got it!
Private key: 5JWLNT79k1Ao4yk1j9fj5zQNRuEVrpUi4hsn2v8oFNfTjPM8Wqf
- Decode with base64 to 360 bits
- Split it into 51 7 bit integers
- Decrease each integer by 1
- Convert to ascii-string
Private key: 5JWLNT79k1Ao4yk1j9fj5zQNRuEVrpUi4hsn2v8oFNfTjPM8Wqf
I'm halfway there, but it's too long O.o as if there's too many characters.
^This is the official "I tried to solve it, then I took an arrow to the knee" post trying to discourage others from trying.
Sadly, with the wallet recovery tools and a console wallet quirk you can get as many bitcoins as you want. I'm going to test it with 1 BTC.
got it, thanks
Looks funded to me: https://blockexplorer.com/address/1FezVeQ2unSiCbKwP9UArahNoMwaprCAyJ
I will post the solution in 7 days if noone solves the puzzle.
tiW2+azidGyZEF7Ts2Vr3Xlt20ufU7vxOo9b1bU0/T275+DH57m6jjpzWPkZ
Hints:
It is an encoded form of a private key.
It is not encrypted.
The private key contains 5 BTC.
Address is:
1FezVeQ2unSiCbKwP9UArahNoMwaprCAyJ
tiW2+azidGyZEF7Ts2Vr3Xlt20ufU7vxOo9b1bU0/T275+DH57m6jjpzWPkZ
Hints:
It is an encoded form of a private key.
It is not encrypted.
The private key contains 5 BTC.
Address is:
1FezVeQ2unSiCbKwP9UArahNoMwaprCAyJ
maybe you should fund the address to give an incentive
i am just curious but how do you guys even know where to start?
well first you turn that freaky thing into a form that looks like a private key. it is encoded rather than encrypted. so likely a given chunk of the key produces a given chunk of the freaky thing.
then you try to add it to a wallet using the recovery tools which do it for you and see if you get that address.
i am just curious but how do you guys even know where to start?
Well, the first layer should be pretty obvious to anyone with programming experience, I'll give more hints as the week progresses.
i am just curious but how do you guys even know where to start?
I'm halfway there, but it's too long O.o as if there's too many characters.
^This is the official "I tried to solve it, then I took an arrow to the knee" post trying to discourage others from trying.
Sadly, with the wallet recovery tools and a console wallet quirk you can get as many bitcoins as you want. I'm going to test it with 1 BTC.
And my brain imploded. Godspeed gentlemen.
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