I find it interesting that this book, entitled "The Shakespearean CIphers Examined" shows the Turtle and Phoenix poem on p.123 as evidence of Francis Bacon's signature.  The claim was made by William Stone Booth whose work is now regarded as 'bunk'.  However, Francis Bacon is credited for inventing a cipher that essentially boils down to a binary encoding.  Probably means nothing but I just found it interesting.



http://marshallfoundation.org/library/wp-content/uploads/sites/16/2014/06/Shakespearean-Ciphers_II_watermark.pdf