Extract LSB

Category: Image

Status: Registered and callable in the CyberChef 11.3.0 compatibility inventory.

Input / output: ArrayBuffer → byteArray

Background: https://wikipedia.org/wiki/Bit_numbering#Least_significant_bit_in_digital_steganography

What it does

Extracts the Least Significant Bit data from each pixel in an image. This is a common way to hide data in Steganography.

Note

Status here means the operation name is implemented and callable. It does not by itself promise byte-for-byte parity for every upstream option. See Compatibility and current status for the verified scope and known boundaries.

Arguments and options

Arguments are positional. Keep their order when using bake() or Pipeline.then().

Index	Name	UI type	PyChef default	Accepted values / format
`0`	Colour Pattern #1	`option`	`'R'`	`'R'`, `'G'`, `'B'`, `'A'`
`1`	Colour Pattern #2	`option`	`''`	`''`, `'R'`, `'G'`, `'B'`, `'A'`
`2`	Colour Pattern #3	`option`	`''`	`''`, `'R'`, `'G'`, `'B'`, `'A'`
`3`	Colour Pattern #4	`option`	`''`	`''`, `'R'`, `'G'`, `'B'`, `'A'`
`4`	Pixel Order	`option`	`'Row'`	`'Row'`, `'Column'`
`5`	Bit	`number`	`0`	A Python integer or floating-point value

Recipe template

Important

This is a call template built from the documented defaults. Replace placeholder values such as empty keys, paths, patterns, or lookup data before running it.

from pychef import bake

input_value = b"example"
args = ['R', '', '', '', 'Row', 0]
result = bake(input_value, [{"op": 'Extract LSB', "args": args}])
print(result)

Pipeline example

from pychef import Pipeline

args = ['R', '', '', '', 'Row', 0]
transform = Pipeline().then('Extract LSB', *args)
result = transform(b"example")

Dedicated operation module

The registered entry point lives in pychef.operations.by_operation.extract_lsb. Direct calls receive the input value and a positional argument tuple:

from pychef.operations.by_operation.extract_lsb import run

result = run(b"example", tuple(['R', '', '', '', 'Row', 0]))

pychef.operations.by_operation.extract_lsb.run(value, args)

Run this operation using its shared internal implementation.

Parameters:

value (str | bytes)
args (Sequence[Any])

Return type:

str | bytes