TISC 2021 - 1865 Text Adventure (Creator’s Writeup)
This challenge was created for The InfoSecurity Challenge (TISC) 2021 organised by the Centre for Strategic Infocomm Technologies (CSIT). It was the 9th leve...
Stickied Posts
NUS Greyhats at CDDC 2015 and (Almost) Epic Mass Exploitation
The Cyber Defenders Discovery Camp 2015 is an introductory computer security workshop slash competition targeted at students at the JC and IHL levels. This i...
Recent Posts
ASIS CTF Finals 2015 - Impossible (Web)
Type juggling in PHP’s weak comparison operator (==) allows an attacker to generate passwords to an administrator account and bypass the original MD5 hashing...
ASIS CTF Finals 2015 - Flag Hunter (Misc)
Use of the X-Forwarded-For header allows an attacker to fake country of origin to collect flags.
ASIS CTF Finals 2015 - Bodu (Crypto)
Use the Boneh-Durfee attack on low private exponents to recover the original two prime factors comprising the private key and decrypt an encrypted flag.
TrendMicro CTF 2015 - Crypto 200
Recover the IV of an AES operation by utilising imperfect knowledge of the key and encrypted output.
PoliCTF 2015 - John Pastry Shop (Pwnable 100)
Fake a valid cake object containing arbitrary ingredients to a bakery service by modifying decompiled Java bytecode and resigning the JAR with spoofed creden...
PoliCTF 2015 - It’s Hungry (Forensics 100)
A troll challenge that required you to transcribe a melody on a hidden area of the website.
PoliCTF 2015
Dystopian Narwhals participated in PoliCTF 2015, and it was a lot of fun. The challenges were challenging, yet engaging and we ended up with a score of 1258 ...