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Author Topic: Bitcoin Key addition  (Read 990 times)
blub (OP)
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October 15, 2013, 07:36:30 PM
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Just to check if I have understood this correctly:

If I have a private key P, and the corresponding public key Q
than the public key to P+1 is Q+G where G is the base point of secp256k1?

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October 16, 2013, 06:24:07 AM
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Yes

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October 20, 2013, 06:56:19 PM
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2nd question:

Is there a efficient way to add 2 compressed keys, or would uncompressing, adding and recompressing them be the way to go?

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October 21, 2013, 12:05:37 AM
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2nd question:

Is there a efficient way to add 2 compressed keys, or would uncompressing, adding and recompressing them be the way to go?
I think you will have to uncompress the keys, in other words calculate the y values of the points and then select the correct signs (from the compressed key information).  Then you can add the two keys correctly.

Once you have added the two keys together then you can use the point as is or, if you wish, compress it again.

Our family was terrorized by Homeland Security.  Read all about it here:  http://www.jmwagner.com/ and http://www.burtw.com/  Any donations to help us recover from the $300,000 in legal fees and forced donations to the Federal Asset Forfeiture slush fund are greatly appreciated!
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