0003764: wallet needs to support /refresh operations to ensure unlinkability

ID	Project	Category	View Status	Date Submitted	Last Update
0003764	Taler	wallet (WebExtension)	public	2015-04-11 15:07	2016-11-20 02:26

Reporter	Christian Grothoff	Assigned To	Florian Dold	Resolution deadline
Implementer		Reviewer
Release signed by		Deployed by
Verifier		Communicator
Data protection authority notification required	No
CSIRT notification required	No
Estimated effort (hours)		Actual effort (hours)	0
Fast-track	No
Work package	none
Priority	low	Severity	feature	Reproducibility	N/A
Status	closed	Resolution	fixed
Platform	i7	OS	Debian GNU/Linux	OS Version	squeeze
Product Version	git (master)
Target Version	0.2	Fixed in Version	0.2

Summary	0003764: wallet needs to support /refresh operations to ensure unlinkability
Description	When coins are partially spent, the residual value needs to be refreshed to ensure unlinkability. The wallet must thus automatically contact the mint and ask for a refresh. For this, the wallet needs to determine which denomination keys should be generated during the refresh, submit the commitment and perform the reveal operation. Keeping the intermediate state of a refresh operation in the database (so as to be able to resume nicely even in the case of a crash) is part of this report. Melting multiple old coins in one refresh operation is NOT part of this feature (this may be a feature of the protocol, but an insecure one and we should certainly not support this in the first iteration).
Tags	No tags attached.

ID	Summary	Status	Assigned To	Estimated effort (hours)
0003756	need (GNUnet-compatible) implementations of ECDHE	closed	Marcello Stanisci
0003759	need HKDF facility for key derivation in Wallet	closed	Marcello Stanisci
0003760	need GNUnet-style double-symmetric encryption for the wallet	closed	Marcello Stanisci
This issue (hours)
Its children (hours)				0
Together (hours)				0

Date Modified	Username	Field	Change
2015-04-11 15:07	Christian Grothoff	New Issue
2015-04-11 15:07	Christian Grothoff	Status	new => assigned
2015-04-11 15:07	Christian Grothoff	Assigned To	=> Marcello Stanisci
2015-04-11 15:07	Christian Grothoff	Relationship added	parent of 0003759
2015-04-11 15:07	Christian Grothoff	Relationship added	parent of 0003756
2015-04-11 15:07	Christian Grothoff	Relationship added	parent of 0003760
2015-04-13 01:05	Christian Grothoff	Target Version	0.0 => 0.1
2015-06-21 08:42	Christian Grothoff	Target Version	0.1 => 0.2
2016-01-22 12:34	Marcello Stanisci	Assigned To	Marcello Stanisci => Florian Dold
2016-01-22 12:34	Marcello Stanisci	Category	wallet (browser-based) => wallet (WebExtensions)
2016-03-20 20:53	Torsten Grothoff	Issue cloned: 0004312
2016-10-17 22:00	Florian Dold	Note Added: 0011340
2016-10-17 22:00	Florian Dold	Status	assigned => informing
2016-10-17 22:00	Florian Dold	Resolution	open => fixed
2016-11-15 15:03	Christian Grothoff	Fixed in Version	=> 0.2
2016-11-20 02:26	Christian Grothoff	Status	informing => closed
2023-04-13 18:37	Florian Dold	Category	wallet (WebExtensions) => wallet (WebExtension)

parent of	0003759	closed	Marcello Stanisci	need HKDF facility for key derivation in Wallet
parent of	0003756	closed	Marcello Stanisci	need (GNUnet-compatible) implementations of ECDHE
parent of	0003760	closed	Marcello Stanisci	need GNUnet-style double-symmetric encryption for the wallet

Florian Dold 2016-10-17 22:00 manager ~0011340	Implemented as of 78ea2ba5b1. We do resume from DB. The only thing not implemented is prompting the user for refresh or other options on payment failure, this is tracked by 0004735.