Read e-book online A brief history of cryptology and cryptographic algorithms PDF

By John F. Dooley

ISBN-10: 331901627X

ISBN-13: 9783319016276

ISBN-10: 3319016288

ISBN-13: 9783319016283

The technology of cryptology is made of halves. Cryptography is the examine of ways to create safe structures for communications. Cryptanalysis is the learn of ways to damage these platforms. The clash among those halves of cryptology is the tale of mystery writing. For over 2,000 years, the will to speak securely and secretly has led to the production of diverse and more and more advanced platforms to guard one's messages. but for each procedure there's a cryptanalyst making a new strategy to holiday that procedure. With the arrival of desktops the cryptographer turns out to ultimately have the higher hand. New mathematically dependent cryptographic algorithms that use desktops for encryption and decryption are so safe that brute-force ideas appear to be the one option to holiday them – to date. This paintings lines the background of the clash among cryptographer and cryptanalyst, explores in a few intensity the algorithms created to guard messages, and indicates the place the sector goes within the future.

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Either there may be no repeated ciphertext sections because either the ciphertext is too short, or the key is too long. So having a technique that gave the cryptanalyst the key length without having to search for duplicate sections of ciphertext would be more efficient. That is exactly what William F. Friedman developed in 1920. Friedman, who we will cover in more depth later, was the head of the Cipher Department at the Riverbank Laboratories in Illinois at the time and had already developed several other solutions for various cryptographic problems.

191]. J. F. 2 The Union Tries a Route During the American Civil War, General Edward Porter Alexander, a commander of artillery, was the father and commander of the Confederate Army Signal Corps. It was Alexander who set up the Confederate States telegraph operations, helped design their cryptographic systems, and tried to decrypt Union correspondence. He was also the artillery officer in charge of the bombardment before Pickett’s Charge on the last day of the Battle of Gettysburg. One night in 1863, Alexander was handed a Union cryptogram that had been taken from a courier who had been captured near Knoxville, Tennessee.

Its ease and rapidity of communication made it the logical choice for military communications and it changed the face of communications in the military; in short order the telegraph caused both the Union and Confederate forces in the American Civil War (1861–1865) to rethink their use of traditional codes. There were at least two good reasons to make the switch. First, codes were hard to use in the field. Codebooks could be easily lost and would then have to be re-issued to every command. Second, the advent of the telegraph had turned command posts into telegraph communication centers and increased the volume of traffic enormously.

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A brief history of cryptology and cryptographic algorithms by John F. Dooley


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