What We Are Reading Today: The Mathematics of Secrets 

Updated 13 September 2018
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What We Are Reading Today: The Mathematics of Secrets 

  • The Mathematics of Secrets takes readers on a fascinating tour of the mathematics behind cryptography — the science of sending secret messages

BOOK AUTHOR: Joshua Holden

 

The Mathematics of Secrets takes readers on a fascinating tour of the mathematics behind cryptography — the science of sending secret messages. Most books about cryptography are organized historically, or around how codes and ciphers have been used, such as in government and military intelligence or bank transactions.Joshua Holden instead shows how mathematical principles underpin the ways that different codes and ciphers operate. Holden focuses on both code making and code breaking and he discusses the majority of ancient and modern ciphers currently known.

Holden begins 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. Holden goes on to explore polyalphabetic substitution ciphers, transposition ciphers, including one developed by the Spartans, connections between ciphers and computer encryption, stream ciphers, and ciphers involving exponentiation.

He also examines 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. He concludes with a look at the future of ciphers and where cryptography might be headed. Only basic mathematics up to high school algebra is needed to understand and enjoy the book.


Rapper 50 cent embraces Saudi Arabia’s Jeddah World Fest with playful name change tweet

The ‘Power’ star joked about changing his name to “50 HALALA.” (AFP)
Updated 16 min 58 sec ago
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Rapper 50 cent embraces Saudi Arabia’s Jeddah World Fest with playful name change tweet

DUBAI:  US rapper 50 Cent took Twitter by surprise as he teased fans with a joke about a potential name change.

The ‘Power’ star joked about changing his name to “50 HALALA.”

This was after the rapper was added to Jeddah World Fest’s line-up in Saudi Arabia.

Tweeps took to the cheeky tweet by storm, replying with warm messages like “welcome to Saudi 50 HALALA.”

Another Saudi fan wrote, “many thanks 50 Halala.”

The music sensation told his 10 million followers, “I been around the world a few times there’s no place [like] JEDDAH.”

He also shared his experience at the festival with excited fans and wrote, “I had a ball at Jeddah fest, kingdom of Saudi Arabia.”

The music festival is part of the Jeddah Season of activities which falls under the Saudi Commission for Tourism and National Heritage’s (SCTH) ambitious program of seasonal entertainment for the Kingdom.