Compress a ciphertext to fewer towers

Truncates the ciphertext's RNS modulus representation to towers_left towers and sets its noise-scale-degree to noise_scale_deg. Used by the interactive multi-party bootstrapping protocol to shrink a ciphertext before sending it across the network (see notes/blocks/E-bindings-rewrite/ gap-matrix.md §21 for the bootstrap-side context).

Usage

compress(x, ...)

Arguments

x

A Ciphertext.

...

Method-specific arguments: towers_left (integer, target tower count), noise_scale_deg (integer, default 1L).

Value

A compressed Ciphertext.