SIKE
- Algorithm type: key encapsulation mechanism
- Main cryptographic assumption: (supersingular) isogeny walk problem
- Scheme authors: David Jao, Reza Azarderakhsh, Matthew Campagna, Craig Costello, Luca De Feo, Basil Hess, Amir Jalali, Brian Koziel, Brian LaMacchia, Patrick Longa, Michael Naehrig, Joost Renes, Vladimir Soukharev, David Urbanik
- Authors’ website: http://sike.org/
- Version: 3.4
- Added to liboqs by: Christian Paquin
Implementation
- Source of implementation: https://github.com/Microsoft/PQCrypto-SIDH
- Implementation version: https://github.com/microsoft/PQCrypto-SIDH/commit/10b0f4dca695751290e5ddf5b297a9a2f0563287 (bugfix on v3.4)
- License: MIT License
- Constant-time: Yes
- Optimizations: Portable C, with assembly optimizations on AMD64 and selected parameter sets on ARM64 (selected at compile-time, enabled by default if available)
Parameter sets
| Parameter set | Security model | Claimed NIST security level | Public key size (bytes) | Secret key size (bytes) | Ciphertext size (bytes) | Shared secret size (bytes) |
|---|---|---|---|---|---|---|
| SIDH-p434 | IND-CPA | 1 | 330 | 28 | 330 | 110 |
| SIDH-p434-compressed | IND-CPA | 1 | 197 | 28 | 197 | 110 |
| SIDH-p503 | IND-CPA | 2 | 378 | 32 | 378 | 126 |
| SIDH-p503-compressed | IND-CPA | 2 | 225 | 32 | 225 | 126 |
| SIDH-p610 | IND-CPA | 3 | 462 | 39 | 462 | 154 |
| SIDH-p610-compressed | IND-CPA | 3 | 274 | 39 | 274 | 154 |
| SIDH-p751 | IND-CPA | 5 | 564 | 48 | 564 | 188 |
| SIDH-p751-compressed | IND-CPA | 5 | 335 | 48 | 335 | 188 |
| SIKE-p434 | IND-CCA | 1 | 330 | 374 | 346 | 16 |
| SIKE-p434-compressed | IND-CCA | 1 | 197 | 350 | 236 | 16 |
| SIKE-p503 | IND-CCA | 2 | 378 | 434 | 402 | 24 |
| SIKE-p503-compressed | IND-CCA | 2 | 225 | 407 | 280 | 24 |
| SIKE-p610 | IND-CCA | 3 | 462 | 524 | 486 | 24 |
| SIKE-p610-compressed | IND-CCA | 3 | 274 | 491 | 336 | 24 |
| SIKE-p751 | IND-CCA | 5 | 564 | 644 | 596 | 32 |
| SIKE-p751-compressed | IND-CCA | 5 | 335 | 602 | 410 | 32 |
Additional comments
No KAT are available for SIDH.