Update README.mdx

nuoxoxo · Nov 17, 2024 · 807546d · 807546d
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diff --git a/level01/README.mdx b/level01/README.mdx
@@ -37,3 +37,15 @@ OR
 
 > ./do_john.sh
 ```
+
+Why use `john`
+- `./john --show` provides this line in the output
+```b
+[DES 128/128 SSE2-16]
+```
+- Data Encryption Standard (DES)
+- DES is not truly encryption in the sense of encryption algorithms
+- it is an old one-way transformation used to store passwds
+- it is insecure due to small key size 
+- using john to bruteforce-crack it is the most effecive way
+```