Write a MATLAB program to evaluate the function y(x) = ln (1/( 1 − x)) for any user-specified value of x, where x is a number < 1.0 (note that ln is the natural logarithm, the logarithm to the base e). Use an if structure to verify that the value passed to the program is legal. If the value of x is legal, calculate y(x). If not, write a suitable error message and quit.

Data Encryption Standard Use Cases. The DES was a data security standard used to encrypt and decrypt non-classified computer data generated by the United States government and any commercial organization. The Data Encryption Standard (DES) is a symmetric-key block cipher published by the National Institute of Standards and Technology (NIST). ... Note that both the right section and the key are 48-bits in length. Also note that the round key is used only in this operation. The DES is a product block cipher in which 16 iterations, or rounds, of substitution and transposition (permutation) process are cascaded.

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