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

FHE Questions
1

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.

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

3

Okay, thank you very much.

4

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?