where to find the old BitCoinJ version 0.1 and 0.2 and 0.3
This appears to be more of a question about the workings of GitHub than a question about Bitcoin itself. However perhaps it is sufficiently related to Bitcoin to be answerable here.
The Github repository for Bitcoinj currently only has information about 14 Bitcoinj Releases from v0.16.2 on Apr 5, 2023 to v0.17 on Feb 21, 2025.
However the list of commits goes back further and the commit page linked in the question starts with a commit on Jul 20, 2011 titled “Update repo URLs. Patch from Gary Rowe.”.
At the right is a <> button with tooltip “Browse repository at this point” If you click that you get to a page with a green <> Code ▼ button. A drop down from that button has “Download Zip”.
If you click that link I would expect you to get the source code that can, in principle, be compiled using the appropriate Java Development Kit (JDK) to recreate Bitcoinj as it existed on Gary Rowe’s system at the date of that commit.
As others have pointed out. An old version of BitcoinJ is unlikely to be of any help in making practical use of a string of 32 characters of unknown origin and unknown meaning.
In particular, knowing which 21st century encryption algorithm was used does not help you to decrypt encrypted data without any knowledge of the encryption key.
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