TenSEAL CKKS Rotation

[VictorLyl]

Question

Does TenSEAL support vector/ciphertext rotation? If so, how exactly can I implement it in Python?

Further Information

I want to perform cyclic shifts/rotations on ciphertext vectors encoded with CKKS (e.g., rotate [x0, x1, x2, …] left/right by a given number of positions) for convolution-like use cases. I have the following questions:

1. Does TenSEAL natively support rotation?
2. What prerequisites are required (e.g., generating and sharing rotation/Galois keys)?
3. What is the exact Python API usage (function names, parameters, and the sign convention for step size)?
4. What are the potential limitations (scheme/slots/performance, etc.)?
5. Can you provide a minimal reproducible code example?

System Information

• OS: Ubuntu
• OS Version: 22.04
• Language Version: Python 3.8.5
• Package Manager Version: Conda 25.3.1
• Library Version: TenSEAL 0.3.15