OSINT

this-is-not-the-flag-you-are-looking-for

Description :

I received this note with this code. Enclosed with it, it asked for help finding a specific US Navy ship that was linked to this code. Can you decipher this code to give me the name of this US Navy ship and the type of ship it was with its associated number?
Flag Format : jctf{USS_Name_Of_Ship_TypeOfShip_Number}

Solution :

  • Quickly searched the image over the internet.
  • Found that image contain Flag Semaphore
  • Decrypted the text: FIREPOWER FOR FREEDOM using Wikipedia
    Flag : jctf{USS_New_Jersey_BB_62}

Crypto

Attn-Agents

Description :

We heard a distress call and received a transmission. Only this text came through. You better take a look at this at once! It’s definitely not Greek, I’ll tell you that right now.

Given Cipher :

Dwwhqwlrq MFWI djhqwv! Dq xqnqrzq DSW lv klmdfnlqj qhwzrunv wr vsuhdg vwhdowk pdozduh xvlqj vwrohq vrxufh frgh. Brxu plvvlrq: wudfn grzq wkh vrxufh ri wkh ohdnv dqg vwrs wkh zlgh-vsuhdg dwwdfnv dfurvv rxu qhwzrunv. Wlph lv uxqqlqj rxw. Wkh {idwh-ri-wkh-zhe} lv lq brxu kdqgv!

Solution :

  • Ceaser cipher with key 3 
    echo "{idwh-ri-wkh-zhe}" | tr 'a-z' 'x-za-w'

Flag : jctf{fate-of-the-web}

Misc

Internal Tensions

Solution :

  • Get Over to Internet Archive and searched the jerseyctf.com
curl https://web.archive.org/web/20240215014427/https://jerseyctf.com/ -s | > grep jctf{.*} -o

Flag : jctf{th3_1nt3rn3t_n3v3r_f0rg3t5_y0ur_b1und3r5}