Posts Tagged “ctf”

Capture the Flag Events or Useful tools for them

• Interactive Encryption and Decryption using RSA 14 March 2022
  • cryptography
  • ctf
  • demos
  • interactive
  • tool

  I had a bit of inspiration recently with Fermat’s Attack on RSA and decided to make an RSA demonstrator. It shows all the steps in performing an RSA encryption using 2 known primes. It might be useful during a CTF when trying to determine small RSA keys by hand. I’ll eventually post a follow up for implementing that attack for small p and q.

• Caeser Cipher Decoding Tool 12 May 2018
  • ciphers
  • ctf
  • interactive
  • tool

  A caeser cipher is a cipher that moves each letter by a fixed offset. You'll see these as a common challenge in easier CTF events. So, I wrote a tool to encode caeser ciphers and generic shift ciphers.

• Caeser Cipher Encoding Tool 09 May 2018
  • ciphers
  • ctf
  • interactive
  • tool

  A caeser cipher is a cipher that moves each letter by a fixed offset. You'll see these as a common challenge in easier CTF events. So, I wrote a tool to encode caeser ciphers and generic shift ciphers.

• Unicode Character Code Decoder 21 April 2018
  • app
  • ctf
  • interactive
  • tool

  This application decodes a unicode string into it's character codes, and names. It's meant to come in handy with CTF events. You enter your string in the form below and it will print out a table with the decode of it. I created it because I found it really difficult to find a decent decoder that gave me the actual codes.