Books on cryptography have been published sporadically and with highly variable quality for a long time. This is despite the tempting, though superficial, paradox that secrecy is of the essence in sending confidential messages — see Kerckhoffs' principle.
In contrast, the revolution in cryptography and secure communications of the last 25 years is well covered in the available literature.
Read more about Books On Cryptography: Early History, Open Literature Versus Classified Literature, The Codebreakers, List
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“No common-place is ever effectually got rid of, except by essentially emptying one’s self of it into a book; for once trapped in a book, then the book can be put into the fire, and all will be well. But they are not always put into the fire; and this accounts for the vast majority of miserable books over those of positive merit.”
—Herman Melville (1819–1891)