slachiewicz commented on PR #12786:
URL: https://github.com/apache/maven/pull/12786#issuecomment-5396335704

   The `plexus-cipher` 2.0 to 2.1.0 bump replaces the key derivation function. 
2.0 chains `SHA-256(password || salt)` in the style of OpenSSL 
`EVP_BytesToKey`; 2.1.0 uses `PBKDF2WithHmacSHA1` at 310000 iterations, from 
[codehaus-plexus/plexus-cipher#23](https://github.com/codehaus-plexus/plexus-cipher/pull/23).
 The two derivations are unrelated, so ciphertext produced by one never 
decrypts under the other. That is why `testitEncryption` fails: 
`MavenCli.encryption()` cannot decrypt the checked-in `settings-security.xml` 
fixture's `<master>` password with the new algorithm.
   
   This reaches users rather than only the test. The same 
`DefaultSecDispatcher` path decrypts server passwords from `settings.xml` 
during ordinary builds, and no migration exists for credentials already on 
disk. The upstream pull request describes the break as intentional.
   
   Closing this in favour of #12811, which lays out the options for the 
maintenance lines. `master` and `maven-4.0.x` are unaffected — they no longer 
depend on `plexus-cipher`.
   
   *This comment was created with AI assistance.*
   


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