On page 41 of Simon Singh’s The Code Book, Singh makes the interesting assertion that “a weak encryption can be worse than no encryption at all.” This seemingly paradoxical statement reveals how hubris can be the downfall of any great cryptographic scheme. Best exemplified in the case of Mary Queen of Scots, when two parties deem a cipher or code secure and therefore write their messages freely with no fear of discovery, this overconfidence can ultimately result in their downfall. Had Mary’s messages not been so explicitly linked to the assassination plot of Queen Elizabeth, and instead been deliberately vague, the evidence against her would have been weak enough to possibly save her life.
The beheading of Mary Queen of Scots should serve as a cautionary tale to any modern cryptographer to remember the possibility that your enemy has already cracked your code, or that another part of the world is already much advanced in the art of code breaking. A good cryptographist should take extra precautions when crafting their message to ensure that, if the encryption fails, the implications of their message, should it land in the wrong hands, are as limited as possible. No code should be deemed unbreakable by its creators, and stenography and subtlety of language are just as crucial in encryption as a strong cipher or nomenclature.