OSINT

Speed-Studying

Solved By : Taz

• searched: UCSD faculty CSE ( https://cse.ucsd.edu/faculty-research )
• UCSD faculty mathematics ( https://www.math.ucsd.edu/people/faculty/ )

• in the CSE got into Algorithm, cryptography etc as it’s most linked to math and got

  https://cstheory.ucsd.edu/faculty.html

• now looked for the common name in both and came across this profile: https://www.math.ucsd.edu/people/profiles/daniel-kane/

• Description here confirmed our target.

FLAG: Daniel Kane

hIDe and seek

Solved By : Taz

• we are given two locations :

  First : ?v=hqXOIZtRYZU
  

• it looks like part of a youtube link
• link: https://www.youtube.com/watch?v=hqXOIZtRYZU
• here he dictates the 1st part of the flag.

   Second : qFHIm0c.jpeg
  

• it’s an image so I first looked into the most used online image sharing platform imgur
• Link: https://i.imgur.com/qFHIm0c.jpeg
• here we have the 2nd part of the flag.

  sdctf{W0w_1_h4D_n0_ID3a!}
  

hIDe and seek 2

Solved By : Ava and nigamelastic

• I’ve gotten some more good intel. Apparently, the following information is the location of another flag!

First piece of info : gg/4KcDWnUYMs

Second piece of info : 810237829564727312-810359639975526490

• the first piece is obviously discord:
• on opening the channel we see

sdctf{m@st3R_h@Ck3R_9999}

• which seems to be flag format, I am guessing that starts with 1 till 9999.

Rabbit Hole

The second part is obviously a unix time stamp:

810237829564727312 is Mon 4 September 1995 18:03:49.564 UTC

and

810359639975526490 is Wed 6 September 1995 03:53:59.975 UTC

• my guess was to check the chats between the times mentioned, but they aren’t matching

• sdctf{m@st3R_h@Ck3R_1995} –> randomly tried its incorrect

• however thanks to Ava we found it was a rabbit hole! below is the correct way to solve it.

• The numbers actually specify the discord links

• usually the discord message links are something like this : https://discord.com/channels/675369276403744776/782835136654737429/840472812690210826

• there are three numbers, i am just taking guess :
  • first number is for server
  • second seems for the channel
  • third seems for message
• we copy link for any message from the server we found and replace the last two numbers with the one given to us in the challenge
• https://discord.com/channels/810237829564727308/810237829564727312/810359639975526490
• boom, we get the right message

sdctf{m@st3R_h@Ck3R_4807}

This flag has been stolen:

Solved By : nigamelastic

• the flag is here : https://web.archive.org/web/20210130094941/https://sdc.tf/

Speed-Studying 2 :

Solved By : Ava

• Simply googling for skyline problem ucsd

• we get this link for PDF : https://cseweb.ucsd.edu/~dakane/CSE101%20Problem%20Archive/F18/Homework3.pdf

• at the bottom we have our flag

sdctf{N1ce_d0rKiNG_C@pt41N}