Marti, thanks for your response.

Erwin

--------------------------------------------------
From: "Martin Boßlet" <[email protected]>
Sent: Sunday, July 17, 2011 7:21 AM
To: <[email protected]>
Subject: Re: Converting ECC public key point-compressed and uncompressed

My understanding is that to convert the form of ecc key from compressed to
uncompressed and from uncompressed to compressed require the knowledge of
the ECC private key.
Is my understanding correct?

You might want to have a look at sections 2.3.3 and 2.3.4 in

http://www.secg.org/download/aid-780/sec1-v2.pdf

No knowledge of the private key is needed.

Regards,
Martin
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