### Post-Quantum Safe Cryptocurrency

##### Tidecoin is a decentralized currency blockchain with a post-quantum secure signature.

##### Tidecoin’s currency design enables it to run on various ubiquitous computing devices, enabling a pervasive process of value, even that in multiple worlds.

##### Total supply: 21 million coins

Circulating supply: 16 million

Exponential halving time / CPU Mining / Community driven / Anonymous creator / Future-proof

## falcon

Fast-Fourier Lattice-based Compact Signatures over NTRU

**F**alcon is a cryptographic signature algorithm submitted to NIST Post-Quantum Cryptography Project on November 30th, 2017. It has been designed by: Pierre-Alain Fouque, Jeffrey Hoffstein, Paul Kirchner, Vadim Lyubashevsky, Thomas Pornin, Thomas Prest, Thomas Ricosset, Gregor Seiler, William Whyte, Zhenfei Zhang.

The point of a post-quantum cryptographic algorithm is to keep on ensuring its security characteristics even faced with quantum computers. Quantum computers are deemed feasible, according to our current understanding of the laws of physics, but some significant technological issues remain to be solved in order to build a fully operational unit. Such a quantum computer would very efficiently break the usual asymmetric encryption and digital signature algorithms based on number theory (RSA, DSA, Diffie-Hellman, ElGamal, and their elliptic curve variants).

**F**alcon is based on the theoretical framework of Gentry, Peikert and Vaikuntanathan for lattice-based signature schemes. That framework instantiated over NTRU lattices, with a trapdoor sampler called “fast Fourier sampling”. The underlying hard problem is the short integer solution problem (SIS) over NTRU lattices, for which no efficient solving algorithm is currently known in the general case, even with the help of quantum computers.

**F**alcon offers the following features:

__Security__: a true Gaussian sampler is used internally, which guarantees negligible leakage of information on the secret key up to a practically infinite number of signatures (more than 2^{64}).__Compactness__: thanks to the use of NTRU lattices, signatures are substantially shorter than in any lattice-based signature scheme with the same security guarantees, while the public keys are around the same size.__Speed__: use of fast Fourier sampling allows for very fast implementations, in the thousands of signatures per second on a common computer; verification is five to ten times faster.__Scalability__: operations have cost O(n log n) for degree n, allowing the use of very long-term security parameters at moderate cost.__RAM Economy__: the enhanced key generation algorithm of Falcon uses less than 30 kilobytes of RAM, a hundredfold improvement over previous designs such as NTRUSign. Falcon is compatible with small, memory-constrained embedded devices.

**F**alcon is a Round-3 NIST finalist for the Post-Quantum digital signature standard.

## roadmap

Mobile wallet for Android

Coingecko and Coinmarketcap listing

Core wallet update

## mining

Tidecoin is using CPU-friendly, GPU-unfriendly, and FPGA/ASIC-neutral PoW algorithm yespower.

In other words, it’s meant to be relatively efficient to compute on current CPUs and relatively inefficient on current GPUs.

The Tidecoin network was built on the premise that it is wasteful for the majority of users to contribute to special purpose mining equipment. The future, however, will see more specialized hardware used in larger numbers by pools.

It transitions gradually into a more distributed mining approach, using ASIC and/or FPGA hardware.

The use of specialized hardware will likely become more important as more users join Tidecoin in the future. Currently, tidecoins are mined primarily by ordinary computers and mobile devices.

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