In turn, this key contains the âcypherâ, which dictates how the data encryption occurs. What is a cypher? A cypher is an algorithm for performing encryption and decryption â a series of steps to follow as a procedure. There are many different ways in which plaintext can be encrypted, but essentially there are two main processes used: symmetric key algorithms and asymmetric key algorithms . Algorithms . Symmetric key algorithms
The average price of a barrel of crude oil this year is $69.90. Prior to September 11th, 2001, oil cost $23 per barrel.This pricing difference has been attributed to the increasing difficulty to obtain oil from the Middle Eastern region, as well as the increasing shortage of oil supply throughout the world.he average price of a barrel of crude oil this year is $69.90. Prior to September 11th, 2001, oil cost $23 per barrel.
WTI and Brent crude oil: average annual spot prices 1990-2014. Annual average WTI and Brent crude oil spot prices from 1990 to 2014 (U.S. dollars per barrel).This graph displays the spot price for West Texas Intermediate and Brent crudes between 1990 and 2014.In 2013, the average spot price for West Texas Intermediate crude oil came to just under 98 U.S. dollars per barrel.TI and Brent crude oil: average annual spot prices 1990-2014. Annual average WTI and Brent crude oil spot prices from 1990 to 2014 (U.S. dollars per barrel).