Post-Quantum Adaptor Signature for Privacy-Preserving Off-Chain Payments
3 views
Skip to first unread message
Dionysis Zindros
Dec 8, 2020, 4:36:53 PM12/8/20
to decr...@googlegroups.com
Tomorrow, Wednesday, December 9, 2020, 10:00 AM UTC, Erkan Tairi from TU Wien will present "Post-Quantum Adaptor Signature for Privacy-Preserving Off-Chain Payments".
Abstract: Adaptor signatures (AS) are an extension of digital signatures that enable the encoding of a cryptographic hard problem (e.g., discrete logarithm) within the signature itself. An AS scheme ensures that (i) the signature can be created only by the user knowing the solution to the cryptographic problem; (ii) the signature reveals the solution itself; (iii) the signature can be verified with the standard verification algorithm. These properties have made AS a salient building block for many blockchain applications, in particular, off-chain payment systems such as payment-channel networks, payment-channel hubs, atomic swaps or discrete log contracts. Current AS constructions, however, are not secure against adversaries with access to a quantum computer. In this talk, we present constructions for adaptor signatures that rely on cryptographic assumptions that are post-quantum secure, and show how they can be seamlessly leveraged to build post-quantum off-chain payment applications such as payment-channel networks without harming their security and privacy.
Join here: https://zoom.us/j/92874956032?pwd=ZFlUdWtYWUZNMzFkcnlaNjE5empBQT09
Password: 17fMte
More seminars: https://decrypto.org/seminar
Abstract: Adaptor signatures (AS) are an extension of digital signatures that enable the encoding of a cryptographic hard problem (e.g., discrete logarithm) within the signature itself. An AS scheme ensures that (i) the signature can be created only by the user knowing the solution to the cryptographic problem; (ii) the signature reveals the solution itself; (iii) the signature can be verified with the standard verification algorithm. These properties have made AS a salient building block for many blockchain applications, in particular, off-chain payment systems such as payment-channel networks, payment-channel hubs, atomic swaps or discrete log contracts. Current AS constructions, however, are not secure against adversaries with access to a quantum computer. In this talk, we present constructions for adaptor signatures that rely on cryptographic assumptions that are post-quantum secure, and show how they can be seamlessly leveraged to build post-quantum off-chain payment applications such as payment-channel networks without harming their security and privacy.
Join here: https://zoom.us/j/92874956032?pwd=ZFlUdWtYWUZNMzFkcnlaNjE5empBQT09
Password: 17fMte
More seminars: https://decrypto.org/seminar
Orfeas Stefanos Thyfronitis Litos
Jan 18, 2021, 4:31:32 AM1/18/21
to decr...@googlegroups.com
Happy New Year Decrypto! Now that the joyous time of kissing 2020 goodbye is over, our beloved seminar is back.
On Wednesday, January 20, 2021, 09:00 AM UTC, Maxim Jourenko from the Tokyo Institute of Technology will present "Payment Trees: Low Collateral Payments for Payment Channel Networks".
Abstract: The security of blockchain based decentralized ledgers relies on consensus protocols executed between mutually distrustful parties. Such protocols incur delays which severely limit the throughput of such ledgers. Payment and state channels enable execution of offchain protocols that allow interaction between parties without involving the consensus protocol. Protocols such as Hashed Timelock Contracts (HTLC) and Sprites (FC'19) connect channels into Payment Channel Networks (PCN) allowing payments across a path of payment channels. Such a payment requires each party to lock away funds for an amount of time. The product of funds and locktime is the collateral of the party, i.e., their cost of opportunity to forward a payment. In the case of HTLC, the locktime is linear to the length of the path, making the total collateral invested across the path quadratic in size of its length. Sprites improved on this by reducing the locktime to a constant by utilizing smart
contracts. We propose the Payment Trees protocol that allows payments across a PCN with linear total collateral without the aid of smart contracts. A competitive performance similar to Sprites, and yet compatible to Bitcoin.
Join here: https://zoom.us/j/97866745516?pwd=SHU5bUhyb3BITk9ibWplTTBya2I2dz09
Password: 8JU5mM
More seminars: https://decrypto.org/seminar
The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
On Wednesday, January 20, 2021, 09:00 AM UTC, Maxim Jourenko from the Tokyo Institute of Technology will present "Payment Trees: Low Collateral Payments for Payment Channel Networks".
Abstract: The security of blockchain based decentralized ledgers relies on consensus protocols executed between mutually distrustful parties. Such protocols incur delays which severely limit the throughput of such ledgers. Payment and state channels enable execution of offchain protocols that allow interaction between parties without involving the consensus protocol. Protocols such as Hashed Timelock Contracts (HTLC) and Sprites (FC'19) connect channels into Payment Channel Networks (PCN) allowing payments across a path of payment channels. Such a payment requires each party to lock away funds for an amount of time. The product of funds and locktime is the collateral of the party, i.e., their cost of opportunity to forward a payment. In the case of HTLC, the locktime is linear to the length of the path, making the total collateral invested across the path quadratic in size of its length. Sprites improved on this by reducing the locktime to a constant by utilizing smart
contracts. We propose the Payment Trees protocol that allows payments across a PCN with linear total collateral without the aid of smart contracts. A competitive performance similar to Sprites, and yet compatible to Bitcoin.
Join here: https://zoom.us/j/97866745516?pwd=SHU5bUhyb3BITk9ibWplTTBya2I2dz09
Password: 8JU5mM
More seminars: https://decrypto.org/seminar
The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
Orfeas Stefanos Thyfronitis Litos
Jan 20, 2021, 3:40:43 AM1/20/21
to decr...@googlegroups.com
Reply all
Reply to author
Forward
0 new messages