<p>It depends on how many times that private key has been used and whether the attacker has access to a side channel. Practically speaking if the attacker does not have access to a side channel and does not know a vulnerability in the secp256k1 curve (there are no known ones), then no, it's not practically possible to figure out the private key.</p>

CC BY-SA 3.0
2016-02-05T14:38:22.120Z
2016-02-05T14:38:22.120Z
Jimmy Song
<p>Suppose someone has single private key, and from that private key he made a public key for Bitcoin, Ethereum, Dogecoin, etc. - is it possible to figure out the private key having those multiple public keys?</p>

<private-key>
Is it possible to exploit the use of the same private keys on different crypto coins?
user32668
# Is it possible to exploit the use of the same private keys on different crypto coins?

(Asked by: username_0 on 2016-02-03)

Suppose someone has single private key, and from that private key he made a public key for Bitcoin, Ethereum, Dogecoin, etc. - is it possible to figure out the private key having those multiple public keys?

**Tags:** private-key


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## 1 answers

### Answer by username_1 on 2016-02-05. Score: 1

It depends on how many times that private key has been used and whether the attacker has access to a side channel. Practically speaking if the attacker does not have access to a side channel and does not know a vulnerability in the secp256k1 curve (there are no known ones), then no, it's not practically possible to figure out the private key.


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