Exercise＃8: Project 5: Cryptanalysis (1): Encryption and Decryption encrypt/decrypt.rb [Instruction]

For understanding and also enjoying lectures, we recommend you to conduct exercises. For this, you need to prepare your computer. Please see: https://tcs.c.titech.ac.jp/downloadE/installationguideWin.pdf (for Windows users), and https://tcs.c.titech.ac.jp/downloadE/installationguideMac.pdf (for Mac users). Also, please visit the web page: https://tcs.c.titech.ac.jp/downloadE/downloadE to get sample program files for the exercises. This is a part of the edX course “Introduction to Computer Science and Programming”. The URL below is the link to the course: https://www.edx.org/course/introduction-to-computer-science-and-programming By taking this edX course (Paid verified track), learners will have access to all the graded assignments and exams. In addition, learners may qualify to receive a verified certificate if they earn a passing score on the assessments before the course ends. Also learners can ask questions to the instructor through the course discussion board on edX.