Post
Topic
Board Development & Technical Discussion
New Weak Signature Challenge
by
johoe
on 30/01/2017, 12:05:10 UTC
Looks like someone put a challenge for breaking weak signatures:

https://blockchain.info/de/tx/695b04afbc477d045d396f062eeff5e950e5e44f91b7e2b273c5a74e27306177

When spending the first three outputs of this transaction, a weak signature was used.

The first output used k=1 when spent.  This was broken immediately by a bot.
The second output used the same k as a previous transaction of  19iAvuzfb8uH2SZLYcbb5wtbBZdn1o3vRm.  The latter is probably a weak brainwallet or something similar.  I didn't break it though.  amaclin, can you explain?
The third output has k=private key.  I solved the challenge and collected.
The fourth output is still unsolved.

The other four outputs are not yet spent.  I guess we still have to wait for the challenge.  Or maybe the address is weak for some other reason.