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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...

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...