Classic Ciphers

Caesar

The most common, and most famous, of all ciphers. Hail Caesar!

Read this: https://www.boxentriq.com/code-breaking/caesar-cipher

Solve using https://www.dcode.fr/caesar-cipher or using https://gchq.github.io/CyberChef/. Note the tradeoffs between the two.

1. How does a Caesar cipher work?
2. "wklv lv d vwdqgdug fdhvdu"
3. "guvf vf n ebg 13 pynffvp"
4. What is a ROT13 cipher?

Substitution

Read this: a href="https://www.dummies.com/games/cryptograms/cryptography-101-basic-solving-techniques-for-substitution-ciphers/" target="_blank"https://www.dummies.com/games/cryptograms/cryptography-101-basic-solving-techniques-for-substitution-ciphers/</a>

Solve using https://www.dcode.fr/monoalphabetic-substitution or https://gchq.github.io/CyberChef/

1. How does a substitution cipher work?
2. "JDS CGJSNAWJCKS JBBV YNBKCZSZ QP ZWBZS AVVBOU A USTC-AIJBTAJCW ZSWNPYJCBG BX TSUUAESU SGWNPYJSZ QP UIQUJCJIJCBG WCYDSNU. JDS TACG JSWDGCHIS CU JB AGAVPMS JDS XNSHISGWCSU BX VSJJSNU AGZ XCGZ JDS TBUJ VCFSVP QCENATU. JDS FGBOG YVACGJSLJ AJJAWF TAFSU CJ YBUUCQVS JB ZSZIWS UBTS VSJJSNU BX JDS AVYDAQSJ KCA JDS FGBOVSZES BN JDS YNSVCTCGANP EISUU BX WSNJACG YBNJCBGU BX JDS YVACG JSLJ."
3. "JDS TACG JSWDGCHIS CU JB AGAVPMS JDS XNSHISGWCSU BX VSJJSNU AGZ XCGZ JDS TBUJ VCFSVP QCENATU."
4. Why is it harder for it to solve shorter text? Or put better, why is it easier to solve with longer text? Think frequencies. Fix the last cipher manually to get the correct answer.
5. Solve this, with the knowledge that the word "substitution" is in the plaintext. "VCZNKOV: GSV NLHG XLNNLM ZOKSZYVGH FHVW ULI HFYHGRGFGRLMH ZIV" Don't forget to use frequency analysis.

Submit all questions for the assignment.