This library includes a set of tools for using zero-width unicode characters to embed human-invisible messages in text.
Watermarking
You can use invisible ink to uniquely identify a piece of text by embedding a UUID:
>>> from invisible_ink import encode_watermark, decode_watermark
>>> encoded_text, uuid = encode_watermark(u'asdf')
>>> print encoded_text
asdf
>>> uuid
UUID('3ca37a37-9c5a-4b9e-a9c0-a50c47c48dba')
>>> decode_watermark(encoded_text)
(u'asdf', UUID('3ca37a37-9c5a-4b9e-a9c0-a50c47c48dba'))
encode_watermark (text, watermark_uuid=None, prepend=False)
Encodes the given text with a watermark string generated from the given uuid. Optionally appends or prepends the watermark string.
Parameters:
text: Unicode string to which the watermark will be added
watermark_uuid: uuid.UUID instance to use as the watermark. (uuid.uuid4() will be used to generate one if not provided.)
prepend: Indicates whether the watermark should be prended to text (defaults to False). If False, the watermark will be appended.
Returns:
A 2-tuple: (encoded_text, watermark_uuid)
decode_watermark (encoded_text)
Decodes the given text, separating out the original text and the watermark uuid.
Paramters:
encoded_text: Unicode string which potentially includes a watermark
Returns:
A 2-tuple: (text, watermark_uuid). If no watermark is detected, text is the original text and watermark_uuid is None.
Installation
$ pip install invisible-ink
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