Prince­ton Univer­sity Press (2017) RRP US$29.95

Cosmos - - Spectrum - The Math­e­mat­ics of Se­crets by JOSHUA HOLDEN

THIS IS A FAS­CI­NAT­ING TOUR of the math­e­mat­ics be­hind cryp­tog­ra­phy, show­ing how its prin­ci­ples un­der­pin the ways that dif­fer­ent codes and ci­phers op­er­ate. Holden starts with “sim­ple” sub­sti­tu­tion ci­phers and goes on to ex­plore polyal­pha­betic sub­sti­tu­tion ci­phers and trans­po­si­tion ci­phers. While it’s all about maths, the book is ac­ces­si­ble – ba­sic high school al­ge­bra is all that’s needed to un­der­stand and en­joy it.

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