The hardest thing is to use a hexadecimal input. Most on-line sites deal only with text. Exception: https://emn178.github.io/online-tools/sha256.html
Determine whether a vector is monotonically increasing
Four quadrant inverse tangent function.
Duplicate each element of a vector.
Create a matrix X, where each column is a shifted copy of the vector v
Area of Triangle with Oblique Coordinates
AES MixColumns() Transformation
Optimal Asymmetric Encryption Padding of message for RSA Cryptography
Number of Primitive Roots and Cyclic
Determine RSA keys (public and private) given two prime number character strings (p and q)
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