λ is beautiful!
λ is powerful!
So I like λ:)
Can you find the beauty of the λ?
Repl: nc beautyoflambda.eatpwnnosleep.com 4242
Challenge: nc beautyoflambda.eatpwnnosleep.com 42
Lambda_Beauty.zip
- Read the Source Code
From source code, you can know that flag is encoded to list of its bits.
- Lambda Calculus
From wikipedia, you can write function that resolve nth elements of list.
- Side Channel Attack
Since Chal server has time limit for evaluation, you can do side channel attack to know nth element of list by using form that diverge(eg. Y operator).