000			nam a22 7a 4500
999			_c28758 _d28758
008			180322b xxu||||| |||| 00| 0 eng d
020			_a9780691141756
082			_a005.82 _bHOL
100			_aHolden, Joshua
245			_aMathematics of secrets : cryptography from caesar ciphers to digital encryption
260			_bPrinceton University Press, _c2017 _aNew Jersey:
300			_axiv, 372 p. _c25 cm.
365			_aGBP _b29.95/ Rs. 1991.68
520			_aThe Mathematics of Secrets takes readers on a tour of the mathematics behind cryptography--the science of sending secret messages. Joshua Holden shows how mathematical principles underpin the ways that different codes and ciphers operate, as he focuses on both code making and code breaking. He discusses the majority of ancient and modern ciphers currently known, beginning by looking at substitution ciphers, built by substituting one letter or block of letters for another. Explaining one of the simplest and historically well-known ciphers, the Caesar cipher, Holden establishes the key mathematical idea behind the cipher and discusses how to introduce flexibility and additional notation. He explores polyalphabetic substitution ciphers, transposition ciphers, including one developed by the Spartans, connections between ciphers and computer encryption, stream ciphers, ciphers involving exponentiation, and public-key ciphers, where the methods used to encrypt messages are public knowledge, and yet, intended recipients are still the only ones who are able to read the message. Only basic mathematics up to high school algebra is needed to understand and enjoy the book." -- adapted from jacket flap.
650			_aCryptography
650			_aComputer security
650			_aCiphers and computers
942			_2ddc _cBK