<blockquote>
  <p>What are the necessarily ecdsa values needed to recover the private key of a p2pkh address.</p>
</blockquote>

<p>A key is recoverable if two signatures are created with the <a href="https://bitcoin.stackexchange.com/q/73622/7272">same R value</a>.</p>

<blockquote>
  <p>When same address is reused numerous times to receive bitcoin what threat does it pose?</p>
</blockquote>

<p>It leads to some loss of privacy, allowing different payments to be linked together.</p>

CC BY-SA 4.0
2019-08-12T10:57:45.263Z
Reusing addresses might also put you in a predicament where you are unaware of which customer paid for what service, especially if they are priced the same.
Ugam Kamat
CC BY-SA 4.0
2019-08-12T11:25:25.690Z
Is that the only conditions for recovering p2pkh private key? Apart from reused R values
Wuncler
CC BY-SA 4.0
2019-08-12T11:28:06.703Z
It's not really relevant that it is a p2pkh key - Two signatures with the same value are all you need to recover an ECDSA private key. The key can also be "recovered" if it was created with bad entropy, such as via a brainwalle.
Raghav Sood
CC BY-SA 4.0
2019-08-12T10:43:33.850Z
2019-08-12T10:43:33.850Z
Raghav Sood
<p>Apart from Re-using same R value, What are the necessarily ecdsa values needed or method to recover the private key of a p2pkh address.</p>

<p>When same address is reused numerous times to receive bitcoin what threat does it pose?</p>

<blockchain><private-key>
Conditions for recovering a p2pkh bitcoin private key
Wuncler
# Conditions for recovering a p2pkh bitcoin private key

(Asked by: username_0 on 2019-08-12)

Apart from Re-using same R value, What are the necessarily ecdsa values needed or method to recover the private key of a p2pkh address.

When same address is reused numerous times to receive bitcoin what threat does it pose?

**Tags:** blockchain, private-key


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## 1 answers

### Answer by username_1 on 2019-08-12. Score: 0 | Accepted answer

> What are the necessarily ecdsa values needed to recover the private key of a p2pkh address.

A key is recoverable if two signatures are created with the [same R value](https://bitcoin.stackexchange.com/q/73622/7272).

> When same address is reused numerous times to receive bitcoin what threat does it pose?

It leads to some loss of privacy, allowing different payments to be linked together.

> **Comments:**
> **username_2**: Reusing addresses might also put you in a predicament where you are unaware of which customer paid for what service, especially if they are priced the same.  
> **username_0**: Is that the only conditions for recovering p2pkh private key? Apart from reused R values  
> **username_1**: It's not really relevant that it is a p2pkh key - Two signatures with the same value are all you need to recover an ECDSA private key. The key can also be "recovered" if it was created with bad entropy, such as via a brainwalle.  

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