zcon0-workshop-notes/selective-disclosure.md

Selective Disclosure

2018.06.26 14:10-15:10 - Jack (Dodger) Gavigan

Possible Disclosures:

• Payment Disclosure

  • For zAddress payments to prove the payment
  • proof for shielded payment (receipt)
  • should be saved before the software throws away the proof
  • Discloses everything (Recipient, amount, memo)

• Selective Disclosure (Not yet merged)

  • Only disclose a selective section (only amount, recipient or ...)
  • might make shielded transactions less efficient, requires changes in the protocol/cryptography

  • If this happen (Selective Disclosure tuple), it's possible to get rid of transparent transactions all together

... // Missing notes

• How to identify who leaked information in case there are multiple parties receiving the receipts.

• what is available in Zcash today?

  • Payment disclosure: Recipients, Amount, Memo
  • Some options to do read only keys in new SPV implementations -- Coming soon --

• One of the main issues with Selective disclosure is inadvertently disclose informations that they do not want disclosed

  • such as UI misuse
  • Device seizure
  • ...