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TLev encryption & decryption

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# fhe-study
Implementations from scratch done while studying some FHE papers; do not use in production.
- `arith`: contains $\mathbb{Z}_q$, $R_q=\mathbb{Z}_q[X]/(X^N+1)$, $R=\mathbb{Z}[X]/(X^N+1)$, $\mathbb{T}_{Q}[X]/(X^N +1)$ arithmetic implementations, together with the NTT implementation.
- `arith`: contains $\mathbb{Z}_q$, $R_q=\mathbb{Z}_q[X]/(X^N+1)$, $R=\mathbb{Z}[X]/(X^N+1)$, $\mathbb{T}_Q[X]/(X^N +1)$ arithmetic implementations, together with the NTT implementation.
- `gfhe`: (gfhe=generalized-fhe) contains the structs and logic for RLWE, GLWE, GLev, GGSW, RGSW cryptosystems, and modulus switching and key switching methods, which can be used by concrete FHE schemes.
- `bfv`: https://eprint.iacr.org/2012/144.pdf scheme implementation
- `ckks`: https://eprint.iacr.org/2016/421.pdf scheme implementation