liboqs algorithm datasheet: `kem_ntru`
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Summary
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- **Name**: NTRU
- **Algorithm type**: key encapsulation mechanism
- **Main cryptographic assumption**: NTRU
- **Scheme authors**: John M. Schanck, Cong Chen, Oussama Danba, Jeffrey Hoffstein, Andreas Hülsing, Joost Rijneveld, Peter Schwabe, William Whyte, Zhenfei Zhang
- **Added to liboqs by**: Douglas Stebila

Parameter sets
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| Parameter set     | Security model | Claimed NIST security level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) |
|-------------------|:--------------:|:---------------------------:|:-----------------------:|:-----------------------:|:-----------------------:|:--------------------------:|
| NTRU-HPS-2048-509 |     IND-CCA    |              1              |           699           |           935           |           699           |             32             |
| NTRU-HPS-2048-677 |     IND-CCA    |              3              |           930           |           1234          |           930           |             32             |
| NTRU-HPS-4096-821 |     IND-CCA    |              5              |           1230          |           1590          |           1230          |             32             |
| NTRU-HRSS-701     |     IND-CCA    |              3              |           1138          |           1450          |           1138          |             32             |

Implementation
--------------

- **Source of implementation:** NIST Round 2 submission, via https://github.com/PQClean/PQClean
- **Implementation version:** https://github.com/PQClean/PQClean/commit/9023fef55861faccd82146cf599b9e46fb9606aa
- **License:** Public domain
- **Language:** C
- **Architectures supported in liboqs master branch**: x86, x64