This elementary encryption scheme goes back to ancient Roman times. In its simplest form, each letter is shifted forward by a fixed number of places. Imagine constructing an alphabet on a wheel, and rotating the wheel to generate the transformation. This can be achieved numerically by a linear modular transformation modulo 26: (Here P is plaintext, C the ciphertext.)
C = P + k (mod 26)
The encryption key is k, and clearly the decryption key is 26 - k (mod 26).
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About Chris W., Math tutor on Chegg Tutors:
University of Pennsylvania, Class of 2007
Math, Computer Science major
Subjects tutored: Trigonometry, Pre-Calculus, Linear Programming, GRE, Pre-Algebra, ACT (math), Web Design, SAT II Mathematics Level 2, Computer Science, PSAT (math), Discrete Math, Geometry (College Advanced), Information Technology, Set Theory, Applied Mathematics, Linear Algebra, Basic Math, Geometry, Computer Certification and Training, Software Engineering, LaTeX, SAT (math), Calculus, SAT II Mathematics Level 1, Number Theory, Algebra, Statistics, Numerical Analysis, and SSAT (math)
Over 7 years of experience teaching math at 3 universities and a community college. Courses ranged from Intermediate Algebra to Calculus II and class sizes varied from 2 to over 200 students. Tutoring since 2000 formally and informally, individually and in groups, for courses from Geometry to Differential Equations. Please note that I generally will not be available for audio and video in live lessons but my experience has been that audio and video aren't really needed.
Hiking, reading, video games, playing the guitar and piano.
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