Weekly Dev Update January 26th, 2018 — A Note on Quantum Computing

The emergence of quantum computers threatens the foundation of cryptography. In the future, quantum computing may break the existing ECDSA signature scheme in Bitcoin. Hcash introduces an updated version of BLISS, a lattice-based signature scheme that provides the smallest key size in existing post-quantum signature schemes. Our version of BLISS is faster, hardened against side-channel attacks, power analysis and 51% attacks. While there are other projects that currently implement versions of XMSS and BLISS, we feel ours is the most complete and secure.

Quantum computers today

Modern computers process information using “classical bits”, which are binary comprised of a 1 or 0. Quantum bits (Qubits) have a two-state mechanic — Horizontal or vertical. Qubits are able to hold both values of 1 and 0 based on their relative positioning to each other. A quantum computer today built by IBM contains between 49 and 50 Qubits, equivalent to a modern computer. Today’s quantum computers have completed 2 million quantum tests, and are being accessed by universities as well as corporations.

Quantum decoherence and chip design have been preventing the “quantum leap” from 50 Qubit quantum computers to processing powers over 100,000 times that of what we are capable of today. Quantum decoherence happens when Qubit chips are exposed. Without a sealed and isolated environment for the Qubits to be polarized and spun, even a simple flashlight can disturb or destroy their ability to function. In December 2017, researchers at the University of New South Wales may be on the verge of introducing a new Qubit chip design that may not only assist with decoherence problems, but also make it possible to put thousands (if not millions) of Qubits onto one quantum chip. Speculation as to when the first fully functional quantum computer dates have moved from 2028 to as early as 2022.

Marketing and our future

As the Hcash team grows, our community is growing too! Last week we introduced new social channels and saw outstanding participation for our 1st AMA taking place on Reddit and Baidu forums.

This week we have been focusing on our Western community planning and organizing for new official channels for South Korean and Japanese markets. We are looking for people to work as community managers and moderators. If you would like to volunteer or recommend a platform unique to your country let us know via Twitter, Reddit or by linking to this Medium post.

Where we are today

- Load/ Volume Testing (till the week ending 2/2/18)

o Stress testing the block chains ability to confirm post quantum transactions

§ Gauge limits on the network by introducing 20 < 50 < 100 < 1000+ nodes

§ Fix bugs in intervals as more nodes are spun to provide and prove network

- Quantum Resistance Audit #1

o Patches to BLISS signature scheme.

o Remove any commented-out code to reduce surface area of attack.

- Security Audit

o Review the overall security of the network

Where we plan to be next week

- BLISS audit complete

- Security audit complete

- Complete Load/ Volume Testing

- System penetration testing commences

- Prepare for Acceptance Testing

o Review from relevant exchanges to verify main chain meets system requirements and is ready for operational use

Please visit our social channels to stay up to date!












“BLISS: Bimodal Lattice Signature Schemes.” BLISS Signature Scheme, bliss.di.ens.fr.

LoCCS Shanghai Jiao Tong University, HcashOrg. “HcashOrg/Hcashd.” GitHub, 19 Jan. 2018, github.com/HcashOrg/hcashd.

Wagstaff, Jeremy. “Australia researchers say find new way to build quantum computers.” Reuters, Thomson Reuters, 6 Sept. 2017, www.reuters.com/article/us-australia-computing-quantum/australia-researchers-say-find-new-way-to-build-quantum-computers-idUSKCN1BH13X.

Choi, Charles Q. “New Technique Could Put Millions of Qubits on a Chip.” IEEE Spectrum: Technology, Engineering, and Science News, 15 Dec. 2017, spectrum.ieee.org/tech-talk/computing/hardware/new-technique-could-put-millions-of-qubits-on-a-chip.

Gohd, Chelsea. “This silicon quantum computer chip design might actually work.” Futurism, 20 Dec. 2017, futurism.com/silicon-quantum-computer-chip-design-actually-work/.

Daukantas, Patricia. “Designing a CMOS Quantum Chip.” Optics & Photonics News (OPN), www.osa-opn.org/home/newsroom/2017/december/designing_a_cmos_quantum_chip/.