This is "Learning Number Theory from the Basics - Introduction to RSA Cryptography" by Yuji Nagashima and Kazuho Fukuda (Coronasha). ✔ No writing or highlighting ✔ No issues with reading all pages ✔ Minor wear and small stains from carrying (see photos) This book carefully explains the basics of number theory up to RSA cryptography, and is recommended for students in information science and mathematics, as well as self-learners. Please purchase only if you understand that this is a used item. Instant purchase OK / Feel free to ask any questions! #NumberTheory #RSACryptography #MathBook #InformationMathematics #CryptographyTheory #UniversityTextbook #SpecializedBook #MathLover