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Primitity Description People claim that RSA with two 1024-bit primes is secure. But I trust no one. That's why I use three 1024-bit primes. I even created my own prime generator to be extra cautious! Files primimity.py primimity-public-key.txt Lets take a look at source primimity.py #!/usr/bin/env python3 from Crypto.Util.number imp...

itsy-bitsy Description The itsy-bitsy spider climbed up the water spout... nc 2020.redpwnc.tf 31284 Files itsy-bitsy.py Lets quickly take a look at now the connection works nc 2020.redpwnc.tf 31284 Enter an integer i such that i > 0: 1 Enter an integer j such that j > i > 0: 2 Ciphertext: 0010001001011101111000001100000010000011...

base646464 Description Encoding something multiple times makes it exponentially more secure! Files cipher.txt generate.js Lets take a look at generate.js, which reads const btoa = str => Buffer.from(str).toString('base64'); const fs = require("fs"); const flag = fs.readFileSync("flag.txt", "utf8").trim(); let ret = flag; for(let i...

Alien-transmissions-v2 Description The aliens are at it again! We've discovered that their communications are in base 512 and have transcribed them in base 10. However, it seems like they used XOR encryption twice with two different keys! We do have some information: * This alien language consists of words delimitated by the character repres...

4k-rsa Description Only n00bz use 2048-bit RSA. True gamers use keys that are at least 4k bits long, no matter how many primes it takes... Files 4k-rsa-public-key.txt which contains a n, e, c triple Seems like there are a lot of primes in the factorization of n, since the factorization process is influenced directly by the size of prime fact...

12-shades-of-redpwn Description Everyone's favorite guess god Tux just sent me a flag that he somehow encrypted with a color wheel! I don't even know where to start, the wheel looks more like a clock than a cipher... can you help me crack the code? Files color-wheel.jpg ciphertext.jpg “Text” XD Lets think like a clock, and sta...

gboad maddy Description You see this everyday if you use android. ?<³|⁰([{⁰|Pf¹&<=f{³&f"{P) Author : Finch the P stands for % as it causes build errors with jekyll, I substituted it Hint len(flag)=28 Someone pointed out after the ctf They we small accent symbols on gboard HMMMMMMMMMMMMMMMMMMMMMM Substituting the ...

We are related Description I can help you send related messages can you out what it is? nc crypto.zh3r0.ml 9841 Lets quickly take a look into server functionality nc crypto.zh3r0.ml 9841 __ __ _ _ \ \ / /__| | ___ ___ _ __ ___ ___ | |_ ___ \ \ /\ / / _ \ |/ __/ _ \| '_ ` _ \ / _ \ | __/ _ \ \ V ...