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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“A book should long for pen, ink, and writing-table: but usually it is pen, ink, and writing-table that long for a book. That is why books are so negligible nowadays.”
—Friedrich Nietzsche (18441900)