Reduce the modulus chain by multiple levels — level

Drops levels levels from x's modulus chain in a single operation. Useful when x is at a deeper level than the ciphertext it will interact with next; level-reducing brings them onto the same rung of the chain.

Usage

level_reduce(x, ...)

Arguments

x: A Ciphertext.
...: Method-specific arguments: eval_key (an EvalKey from key_gen), levels (integer, default 1L).

Value

A Ciphertext at x$level + levels.

Details

An evaluation key is required — supply it from key_gen(cc, eval_mult = TRUE).