Writeup by: shalaamum Solved by: shalaamum Summary This challenge used garbled circuits. They have a cryptographic application, which is however irrelevant for understanding this challenge and solution. Essentially we get the bits of the flag xored by random key we do not know, but we can also define some logical gates …

Read More

Writeup by: ChrRaz Kuuuurveen We are given the following challenge description. A client and a server have been communicating the flag over an encrypted channel. Der er en Kuuuuuuuuuuuuuuurveeeeeee, er den ikke smuk? En client og en server kommunikere over en krypteret kommunikationskanal. Se om du ved hjælp af source …

Read More

Writeup by: ChrRaz 80s Commitments When opening http://80s-commitments.hkn we are greeted with the following page: We are given a public key and a “commitment”. If we enter this commitment into the “reveal” box we get redirected to the following page which shows an embedded youtube video. …

Read More