> For the complete documentation index, see [llms.txt](https://ctf.zeyu2001.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ctf.zeyu2001.com/2021/dsta-brainhack-cddc21/break-it-down-crypto.md).

# Break it Down (Crypto)

## Arch 6x64

Cyberchef magic + ROT13.

`CDDC21{0h_mY_b4S3}`

## No Rotations

Monoalphabetic substitution.

`CDDC21{sUbsTituTion_CiPhEring}`

## Nice Encryption

Cyberchef magic with known crib `CDDC21`.

(XOR each hexadecimal number with 0x71)

`CDDC21{Wh0_wrot3_th!s_Thin6?}`