🔐Cryptography

1. Message Me

Attachment: message.txt

Solution:

Carefully read the description where it mentions about old keypad. That means needs to use keypad like Nokia 3310.

Flag must start with CYBER and in MD5 hash.

Flag: CYBER{a528cefd054f5783301b98058597cfc2}

2. Baby RSA (TJCTF)

Attachment: message.txt

Solution:

This challenge can be solved either manual or automated. We already given n,e and c where e are prime.

Flag: TJCTF{thr33s_4r3_s0_fun_fb23d5ed}

3. Honey Bee

Attachment: message.png

Solution:

Reading the description again, it mentions about what is the Mormon word for this title which refer to Honeybee.

Since this category cryptography, assume this is cipher. Let use some online tools (2deseret)

This will be read as CYBERSOHARD.

Flag: CYBER{SO_HARD}

4. Number?

Attachment: Hint_C.jpg Flaghere.zip

Solution:

Read the description, and it mention about each picture represent 4 digit and some definition on this cipher.

For this challenge, it easier to use reverse images. (Google images) to identify what cipher are this.

We found the cipher type, using online tools to decode it. Do some research on how to read the cipher since it combines 4 digit into 1 symbols.

Decode first symbols and let decode back to see if this image are same.

= 7106

Finish all the decode part and you will get combination 32 long password.

Pass: 71061521733184734742368446278657

FLAG: CYBER{OUCH_YOU_F0UnD_M3!!}

5. Annoying

Attachment: annoying.txt

Solution:

Go through the annoying.txt file, you will find some pattern here starting with senate bill, title, and sections. Looking into website.

Use the tools provided.

Flag: CYBER{D0NT_SP4M_M3}