Cryptography – 495 points (11 solves) – Chall author: Polymero (me)

“WANTED: CRYPTO PSYCHIC FOR SINGLE TIME HIRE! (URGENT)
My signatures are all broken and I need somebody to magically fix them ASAP!”

Cryptography – 500 pts (1 solve) – Chall author: Polymero (me)

What do you mean “We think you spend too much time with matrices.”? It’s just a hash function, jeez…

Cryptography – 443 pts (20 solves) – Chall author: Polymero (me)

One-time oracles using RSA or Paillier are not a great idea due to those slippery mathemagicians… I would like to see them slip their way through RSA AND Paillier! After all, you cannot rob two banks at the same time. … What?

Cryptography – 469 pts (15 solves) – Chall author: Polymero (me)

Pai-ai-ai… My Paillier scheme seems to be broken and I stored my favourite flag in it. Please help me get it back, will you? Who could have guessed this would ever happen? … Me… I- I wrote it… yeah.

Cryptography – 500 pts (0 solves) – Chall author: Polymero (me)

“To store our most embarrassing secrets, we created a Remote Secure Armoury protected by layered RSA encryption with XOR blinding. Never again will my friends be able to mock me for my use of words!”

Cryptography – 496 pts (6 solves) – Chall author: Polymero (me)

“I chopped up my flag and hid it behind this simple key exchange. Try dlogging your way in if you are brave enough!”

Cryptography – 500 pts (0 solves) – Chall author: Polymero (me)

“Welcome to the Shrine of the Sweating Buddha. Share the burden of your worries, my child ~~~.”

Hint: share some (7) of your worries and perhaps your fortune will guide you to the flag.

Cryptography – 499 pts (3 solves) – Chall author: Polymero (me)

“HADIOR will hold the DOOR.”