Sighhh
This is the third challenge from the Web & Crypto section of DSO-NUS CTF 2021. The challenge uses digital certificate extension with ASN.1 encoding to st...
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Protect the Vaccine
This is the second challenge from the Web & Crypto section of DSO-NUS CTF 2021. The challenge introduced a new LSB attack on Special-Structured RSA Prime...
Poor Men
This is the first challenge from the Web & Crypto section of DSO-NUS CTF 2021. The challenge introduced a different variation of RSA that is safe from ac...
Gamer’s Cipher
This is the first challenge from the Cryptography section of BambooFox CTF 2021. It introduced Nimber field and do encryption using it.
ORZ network
This is the third challenge from the Cryptography section of BambooFox CTF 2021. The challenge wants us determine if a Diffie-hellman parameter is vulnerable...
Can COViD break Alice’s design?
This is the second challenge from the Cryptography section of Stack-The-Flag 2020 by govtech-csg. It uses LFSR stream cipher to encrypt 500 bytes of data and...
Can COViD steal Bob’s idea?
This is the first challenge from the Cryptography section of Stack-The-Flag 2020 by govtech-csg. The challenge wants us to break vulnerable Diffie-hellman pa...