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Web Tools for Classical Cryptology

Discover the essential web tools for classical cryptology in this comprehensive overview. This resource caters to students like those in Professor Lesh's general education math course, helping them decode messages, solve homework problems, and understand encoding techniques. From various types of ciphers, including Caesar, monoalphabetic, and polyalphabetic ciphers like the Vigenère cipher, this guide provides an introduction to cryptographic concepts, tools for encoding and decoding messages, and techniques for frequency analysis. Aim to aid study, making cryptology easy to grasp.

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Web Tools for Classical Cryptology

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  1. Web Tools for Classical Cryptology Tristan Beeble

  2. Overview • Background • Types of problems • Tools

  3. Cryptology • Cryptography • Encoding a message • Cryptoanalysis • Decoding a message

  4. Background • Client: Professor Lesh • Gen-ed Math course • Help solve homework problems

  5. Goals • Decoding • Additional study • Aid, not solve • Easy to use

  6. Terms • Plaintext: Message you want to send • Ciphertext: Actual text sent • Key: What’s needed to decode • Algorithm: How to decode • Cipher: allowed plaintexts, keyspace, encryption and decryption algorithm

  7. Types of Ciphers • Caesar Cipher • Monoalphabetic Ciphers • Polyalphabetic Ciphers • Vigenère Cipher

  8. Caesar Cipher Plaintext: tristan Key: 7 Ciphertext: aypzahu

  9. Monoalphabetic Cipher Caesar Plaintext: A B C D E Ciphertext: B C D E F Monoalphabetic Plaintext: A B C D E Ciphertext: E C A B D

  10. Monoalphabetic cipher

  11. Polyalphabetic Cipher • Vigenère cipher Plaintext: i n i t i a t e Key: u n i o n u n i

  12. Vigenère cipher

  13. Vigenère Cipher Plaintext: i n i t i a t e Key: u n i o n u n i Ciphertext: c a q h v u g m

  14. Caesar Cipher Decryption • Same idea as Encryption • Backwards Ciphertext: aypzahu Key: 7(-7) Plaintext: tristan

  15. Caesar Cipher Tool

  16. Caesar Cipher Tool

  17. Monoalphabetic Cipher Decryption • First Step:Guess work • Word length • Partial solutions • Second Step:Frequency Analysis

  18. Frequency analysis

  19. Frequency Analysis Tool

  20. Monoalphabetic Cipher Tool lmstn qtomq ***e* te**t e t

  21. Vigenère Cipher Decryption • Repeated Segments • Factors • Plaintext: the bird ate the cat • Key: uni onun ion uni onu • Cipher: num pvlq ihr num qnn 10 • Multiple Frequency Analysis

  22. Vigenère Cipher Tools fgsjetladkjdjkeifldlkowfgewsloiodkjplkjhgfetllk DJK 21

  23. Repeated Substrings THBZTHBT T 1 0 0 0 1 0 0 1 H 0 2 0 0 0 2 0 0 B 0 0 3 0 0 0 3 0 Z 0 0 0 4 0 0 0 0 T 1 0 0 0 5 0 0 1 H 0 2 0 0 0 6 0 0 B 0 0 3 0 0 0 7 0 T 1 0 0 0 1 0 0 8 Repeated substring started Repeated substring ended

  24. Vigenère Cipher Tools

  25. Future work • Encryption • More types of Ciphers

  26. Accomplishments • Save the student time • Allow them to do more • Easier for the professor • More complex examples

  27. Questions?

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