Hello, may I ask how to https://eprint.iacr.org/2012/240.pdf convert the small ring dimension in this article to the original large ring dimension. Based on this question Looking forward to your reply very much.

Sorry to bother you again, I did not find any algorithm in this paper on how to convert small ring dimensions into large ring dimensions. It’s also possible that I didn’t notice, can you tell me?

Based on the post of the authors and section 4.2 of the paper, it seems to be based on the paper you referenced. You can check their code to verify SophOMR/include/compress.h at main · keewoolee/SophOMR · GitHub .

Yes, the compressed code provided here is consistent with the paper , but there is no process of packaging small rings dimensional into large rings dimensional.

How to merge several small CKKS ciphertexts into one large CKKS ciphertext

FHE Questions

ypolyakov December 20, 2024, 5:33am 2

I suggest looking at Oblivious Message Retrieval (last bullet point). The code based on OpenFHE is available here: GitHub - keewoolee/SophOMR: Proof of Concept Implementation of SophOMR

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How to merge several small CKKS ciphertexts into one large CKKS ciphertext

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