> For the complete documentation index, see [llms.txt](https://the-winrars.gitbook.io/writeups/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://the-winrars.gitbook.io/writeups/2020-writeups/ractf/crypto/0x-series.md).

# 0x Series

1. Monoalphabetical Substitution Cipher (trial and error)

   **Flag: documents**
2. Vigenere Cipher (trial and error)

   **Flag: zurich**
3. Railfence Cipher (freq anal)

   **Flag: ANUALLEAVE**
4. Columnar Transposition Cipher (freq analysis, x's at end for padding)

   **Flag: CONCERNEDENCRYPTED**
5. Bifid Cipher (lack of j hinted at grid cipher, cant be playfair because of doubles)

   Key: ReallyAwesome

   **Flag: Campbell**
6. Periodic Gromark Cipher (number key, nothing else given)

   Key: agency

   **Flag: organization**