13 pages

Boolberry Solves CryptoNote Issues

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Publié par	seorumer
Publié le	06 octobre 2016
Nombre de lectures	3
Poids de l'ouvrage	1 Mo

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Boolberry Solves CryptoNoteIssues

BoolberrySolves CryptoNote Issues

Boolberry’s feature: Unlinkable Outputs

In thispresentationyou’ll ﬁnd out how anonymity worksinordinary CryptoNote technology and Boolberry’smodiﬁed CryptoNote technology.

BoolberrySolves CryptoNote Issues

Let’s compare!

OrdinaryCryptoNoteTechnology Alicewants to send a coin toRomulusand keep thistransferprivate. To achieve this, she uses Bob’s and Carol’s coins as*mixins. At the same time,Davewants to send a coin toRemus, and also wants to keep the transferprivate. To achieve this he tookBob’s coin as a*mixin.

*mixin- it's a part of Cryptonote technology that makes your transfer private. Ordinary CryptoNote transfer

Alice

Bob

Carol

Dave

coin

Romulus: “From Alice, Bob or Carol?”

Remus: “From Bob or Dave?”

BoolberrySolves CryptoNote Issues

Let’s compare!

OrdinaryCryptoNoteTechnology Romulus’andRemus’transfer is unlinkable. Great!

But what ifBobwill decide to send his coin toLeylawithout mixin?

Alice

Bob

Carol

Dave

coin

Bob sending his coin to Leyla without mixin

coin

Romulus: “From Alice, Bob or Carol?”

Leyla: “I received a coin from Bob!”

Remus: “From Bob or Dave?”

BoolberrySolves CryptoNote Issues

Let’s compare!

OrdinaryCryptoNoteTechnology OnceBobsent his coin without mixins, his coin in othermixinsbecamefake.

Alice

Bob

Carol

Dave

coin

Bob sending his coin to Leyla without mixin

coin

Romulus: “From Alice, Bob or Carol?”

Leyla: “I received a coin from Bob!”

Remus: “From Bob or Dave?”

BoolberrySolves CryptoNote Issues

Let’s compare!

OrdinaryCryptoNoteTechnology Since all mixins withBob’s coin becamefake, Dave’s transferis not unlinkable anymore!

Alice

Bob

Carol

Dave

coin

Remus receives a linkable coin

coin

Romulus: “From Alice, Bob or Carol?”

Leyla: “I received a coin from Bob!”

Remus: “Transaction became linkable!”

BoolberrySolves CryptoNote Issues

Let’s compare!

OrdinaryCryptoNoteTechnology The same issue occurs whenCarolsends her coin without mixin toJohn. Alices’s transferis not unlinkable anymore!

Alice

Bob

Carol

Dave

coin

Carol sending her coin to John without mixin

coin

Romulus: “Transaction became linkable!”

Leyla: “I received a coin from Bob!”

Remus: “Transaction became linkable!”

John:“I received a coin from Carol!”

BoolberrySolves CryptoNote Issues

Let’s compare!

OrdinaryCryptoNoteTechnology The problem is that ordinary CryptoNote coin’s (Bytecoin/Monero) *ring signatureswill lose unlikabilityfrom time to time.

*ring signature- Cryptographic algorithm used in CryptoNote technology for transaction validation. Carol sending her coin to John without mixin

Alice

Bob

Carol

Dave

coin

Romulus: “Transaction became linkable!”

Leyla: “I received a coin from Bob!”

Remus: “Transaction became linkable!”

John:“I received a coin from Carol!”

BoolberrySolves CryptoNote Issues

How doessolve this critical issue? OrdinaryCryptoNoteTechnology

ModiﬁedCryptoNoteTechnology

Unlike otherCryptoNotecoins such asBytecoinandMonero, Boolberryhas a specialﬂagin each transaction’s output. With that ﬂag the sender can set the output to be used only with speciﬁed number of mixins. In other words, this ﬂag guarantees thatthiscoin won’t be spent without mixins, so it will never compromise ring signatures in which it was involved.

BoolberrySolves CryptoNote Issues

Boolberry’s solution

ModiﬁedCryptoNoteTechnology Boolberry’s outputs with guaranteed anonymity

Alice

Bob

Carol

Dave

coin

Bob is trying to send his coin without mixins, but he can’t!

coin

Romulus: “From Alice, Bob or Carol?”

Leyla: “You need to use mixins!”