Topic: Claim the coins challenge - The typo scenario (Read 2010 times)

ECKey key = null;
final String ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
Boolean solved = false;
for( int i = 0; !solved && i < args[0].length(); i++ )
{
	// Replace one character in the private key
	String before = args[0].substring( 0, i );
	String after = args[0].substring( i+1 );
	for( int j = 0; !solved && j < ALPHABET.length(); j++ )
	{
		String keyStr = before + ALPHABET.substring( j, j+1 ) + after;

		try {
			DumpedPrivateKey dumpedPrivateKey = new DumpedPrivateKey(params, keyStr);
			key = dumpedPrivateKey.getKey();
					
			System.out.println("Address from private key is: " + key.toAddress(params).toString());
			solved = true;
			break;
		} catch( AddressFormatException e ) {
		}
	}
}
if( !solved )
{
	System.out.println( "Could not correct private key!" );
	return;
}

#!/usr/bin/python
import base58, hashlib

def sha_checksum(data):
    return hashlib.sha256(hashlib.sha256(data).digest()).digest()[:4]

sec = '5JjNVWPaRTPg1i4etqfPHFnsDZ1Js5qBYXFH9G4jC2Drb6kERsm'

data = base58.b58decode(sec, 37)

checksum = data[-4:]
key = data[:-4]

for i in xrange(len(sec)):
    for c in base58.__b58chars:
        modkey = sec[:i] + c + sec[i+1:]
        decoded = base58.b58decode(modkey, 37)

        if decoded:
            if sha_checksum(decoded[:-4]) == checksum:
                print 'Found:', modkey
                print (6+base58.__b58chars.index(c))*' '+'^'

Output:Found: 5JjNVWPaRTPg1i4etqfPHPnsDZ1Js5qBYXFH9G4jC2Drb6kERsm
                                   ^