Create EncryptedMultisigDescriptor.java #1788
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This enhances multisig privacy by encrypting the descriptor with public-key-derived symmetric keys, preventing balance exposure. Advantages: Simplifies setup for individuals without private keys or Shamir sharing; enables wallet access via any two zpubs; maintains security as decryption requires matching pairs; avoids revealing full setup to single parties.
Replaced broken code relying on non-existent Java methods (getAuthenticationTag() and setAuthenticationTag()), causing compilation errors. Correctly implemented AES-GCM encryption and decryption: Removed manual extraction/injection of authentication tags. Encrypted blobs now properly combine IV and ciphertext (with embedded tag). Decryption validates integrity via Cipher.doFinal(). Ensured secure key derivation using SHA-256 on sorted zpubs.
Added support for 2-of-3 multisig by generating all key pairs (zpub1/zpub2, zpub1/zpub3, zpub2/zpub3). Encryption now creates one encrypted blob per pair (3 blobs total). Decryption tries all pairs and returns the first valid result. Added input validation and made the system easily extensible for N-of-M setups.
kmk142789
approved these changes
Sep 4, 2025
kmk142789
approved these changes
Sep 4, 2025
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Apparently, Liana has just proposed a BIP draft with that vision in mind: bitcoin/bips#1951." |
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Yes - if this gets finalized I'll strongly consider implementing it. |
kmk142789
approved these changes
Sep 15, 2025
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This enhances multisig privacy by encrypting the descriptor with public-key-derived symmetric keys, preventing balance exposure. Advantages: Simplifies setup for individuals without private keys or Shamir sharing; enables wallet access via any two zpubs; maintains security as decryption requires matching pairs; avoids revealing full setup to single parties.