upto level 15

Signed-off-by: ayushka11 <[email protected]>

Author: ayushka11

level11.md

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+## **level11**
+
+the cipher `ROT13` rotates all letters by 13 characters.
+
+we use the `tr` command to translate letters.
+eg. `tr 'a' 'z'` converts all a's to z's.
+
+`cat data.txt | tr '[A-Za-z]' '[N-ZA-Mn-za-m]'` this command would reverse the rot13 cipher.
+
+save the psswd and exit.

level12.md

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+## **level12**
+
+we first copy the data file to /tmp using below `mkdir`, `cd`, `cp` commands.
+
+`mkdir /tmp/ayu`
+`cd /tmp/ayu`
+`cp ~/data.txt .`
+
+using `xxd -r data.txt data` to reverse the hexdump.
+
+we use `file data` to see that this file is a gzip compressed file.
+
+we need to rename and decompress it.
+
+`mv data data.gz && gzip -d data.gz`, mv to rename and gzip -d to decompress.
+
+we use `file data` to see that it is a bzip2 archive.
+
+using `bzip2 -d data` to decompress this.
+
+`file data.out` to see that it is again a gz archive.
+
+`mv data.out data.gz && gzip -d data.gz`, same command as above but with different file name.
+
+`ls` to see that it contains a file data
+
+`file data` 
+output - `data: POSIX tar archive (GNU)`
+
+these files have extension .tar and can be decompressed using `tar -xvf filename`, repeating these steps until we reach a file with ascii text.
+
+cat the output, save the psswd and exit.
+
+
+

level13.md

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+## **level13**
+
+`cat sshkey.private` to see the ssh key.
+
+copy the key and change the permissions using below cmd.
+
+`chmod 600 sshkey.private`
+
+now, login to bandit14 using the key
+
+`ssh -i key [email protected] -p 2220`

level14.md

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+## **level14**
+
+`nc` command is used for reading, writing and redirecting data across networks.
+
+the psswd is in `/etc/bandit_pass/bandit14` file, so we `cat` it to get the psswd.
+
+now, using the `nc` cmd to connect a remote server.
+
+`nc 127.0.0.1 30000`
+
+enter the psswd here.
+
+you get the psswd for level15, save it and exit.
+

level15.md

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+## **level15**
+
+we try connecting to localhost at 30001 using openssl
+
+`openssl s_client -connect localhost:30001`
+
+The s_client command implements a generic SSL/TLS client which connects to a remote host using SSL/TLS.
+
+then, we paste the prev psswd to get the new one.
+
+save the psswd and exit.
+