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I was not sure how to formulate the question title. What I want to achieve is the same as VanityGen and many other tools do to create an address starting with a predefined part, but with private keys.
So basically I want to create a Bitcoin public/private key pair of which the private key begins with a string I define.
Are there tools that already do this? If not, is it possible? How should it be done theoretically?
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You can choose the private key to be whatever you want, and calculate the corresponding public key and bitcoin address.
However, the more predictable the private key is, the weaker your security is. You don't want your private key to be "password" or expect your wallet to be empty. – David Schwartz – 2013-03-20T11:35:51.170
No I just want to know a specific part of it so that I can write the rest down and add additional security to remember a part myself. – Steven Roose – 2013-03-20T12:04:57.303
@AlgolCobol, How can I create such a priv/pub key pair? – Steven Roose – 2013-03-20T12:05:15.573
Still the question is only answered partially. "Are there tools that already do this? How should it be done theoretically?" – Steven Roose – 2013-05-12T14:35:51.070
Maybe think about brain wallet (just a few words to remember/save or combine). Whenever you will need to spend coins you will just go to bitaddress.org and generate private key. – None – 2013-05-11T22:11:48.143