Re: Every wallet address has just one private key which can be generated again?
There are bitcoin wallet addresses which are actually public keys, right?
No. The address is derived from the public key. It is the RIPEMD160 hash of the SHA-256 hash of the public key.
Every public key has one private key. EDIT : this is wrong : There is actually 2^96 private key that corresponds to an address.
This actually is TRUE.
Each public key only corresponds to ONE private key.
296 private keys (2256 / 2160) do result in the same address (Note that address do NOT exist on a technical level) and this is NOT a security threat).
There are bitcoin address generator programs which generates random addresses.
They generate random private-/public- keys and derive the address, yes.
There is very little possibility to generate a public and private key of an already used wallet, correct?
Pretty much impossible (if there are no implementation errors).
When a user wants to create a bitcoin address, the same addres generator generates a pair of public & private keys. If another user wants to create a random bitcoin addres, the same generator algorithm can generate previous public & private keys once more.
Such a 'generator' either uses a seed to derive private keys or generates private keys itself.
A private key basically is just a really really big (random) number.
This means, if there is a software (I know actually this exists) which generates random addresses and checks their balance, there is little possibility to find a wallet with balance in it.
Practically no chance.
This can be another bitcoin stealing algorithm, right?
Something like a 'bitcoin stealing algorithm' doesn't exist.
Is there any prevention method agains random address generation?
You can't forbid someone to pick a random number, can you ?