I'm sorry that your not familiar with Linux version 0.2.0. It had encryption for the private key, not the wallet, it was a option that you could use. If anyone is familiar with it can you tell me what type is was. There has to be someone that does remember it. Please help !!!!
I took a look through the Bitcoin 0.2.0
source code and there is no mention of encryption at all whatsoever. The Bitcoin software has never had support for encrypting individual private keys. You are either using some other software or you are mistaken.
What does your "encrypted private key" look like?