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2020 Writeups
Angstrom
Git Good
Secret Agents
windows of opportunity
Califrobnication
Patcherman
Just Rust
No canary
WS3
Confused Streaming
Reasonably Secure Algorithm
Defund's Crypt
Low-kee
Discrete Superlog
Wacko Images
Shifter
Xmas Still Stands
Noisy
Canary
Inputter
clam clam clam
PSK
Taking Off
Consolation
Wooosh
Signal_of_hope
One Time Bad
Revving up
bsidesBOS
Crypto CTF
Covid19 CTF
FWordCTF
Google
Hacktivity Con
Houseplant
HSCTF
NahamConCTF
Plaid
RACTF
Redpwn CTF
rgbCTF
Sharky
TJCTF
Tokyo Westerns CTF
Zh3r0 CTF
2021 Writeups
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Git Good

/.git/index
/./git/thisistheflag.txt
"The flag was here"
  • Clone git repo
  • Git clone https://gitgood.2020.chall.actf.co/.git/​
  • Find the commit logs at /.git/logs/HEAD
  • Get the Sha-1 hash of the first log
  • Git checkout 6b3c94c0b90a897f246f0f32dec3f5fd3e40abb5
  • (Switches to that version of the repo)
  • Cat thisistheflag.txt
    actf{b3_car3ful_wh4t_y0u_s3rve_wi7h}
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