[1]https://thehackernews.com/2022/03/researchers-demonstrate-new-side.html

   "A group of academics from the North Carolina State University and
   Dokuz Eylul University have demonstrated what they say is the "first
   side-channel attack" on homomorphic encryption that could be exploited
   to leak data as the encryption process is underway."

   "Basically, by monitoring power consumption in a device that is
   encoding data for homomorphic encryption, we are able to read the data
   as it is being encrypted," Aydin Aysu, one of the authors of the
   study, [2]said. "This demonstrates that even next generation encryption
   technologies need protection against side-channel attacks."

   "Homomorphic Encryption is a [3]form of encryption that allows certain
   types of computation to be performed directly on encrypted data without
   having to decrypt it in the first place."

References

   1. https://thehackernews.com/2022/03/researchers-demonstrate-new-side.html
   2. https://news.ncsu.edu/2022/03/stealing-homomorphic-encryption-data/
   3. https://en.wikipedia.org/wiki/Homomorphic_encryption