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Masta: An HE-Friendly Cipher Using Modular Arithmetic
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DOI：10.1109/ACCESS.2020.3033564.png)
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摘要
En 中文
The Rasta cipher, proposed by Dobraunig et al. (CRYPTO 2018), is an HE-friendly cipher enjoying the fewest ANDs per bit and the lowest ANDdepth among the existing ciphers. A novel feature of Rasta is that its affine layers are freshly and randomly generated for every encryption. In this paper, we propose a new variant of Rasta, dubbed Masta. Similarly to Rasta, Masta takes as input a (master) secret key and a nonce, and generates a keystream block for each counter. On the other hand, Masta has two main differences from Rasta: Masta uses modular arithmetic to support HE schemes over a non-binary plaintext space, and it uses a smaller number of random bits in the affne layers by defining them with infinite field multiplication. In this way, Masta outperforms Rasta in a transciphering framework with BGV/FVstyle HE schemes. Our implementation shows that Masta is 505 to 592 times faster in terms of the throughput on the client-side, while 4792 to 6986 times faster on the server-side.
Keyword:
Ciphers
Encryption
Servers
Zinc
Throughput
Homomorphic encryption
stream cipher
transciphering framework
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IF:
3.6
论文数:
9.8W
被引数:
29.4W
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