Tags » Substitution Cipher

Challenge 12: Nigh Impossible

Here’s Challenge #12 for November 8, 2017.

Today, I wanted to learn about homophonic substitution ciphers. These ciphers aim to thwart frequency analysis by assigning multiple ciphertext symbols to each plaintext symbol. 334 more words

Weekly Challenges

PicoCTF 2017 - Substitute

Another day, another challenge.

Today’s blog post will explore solving the “Substitute” challenge inside of the PicoCTF.

Let’s get started.

Clicking on the challenge we see the following: 97 more words

Introduction to Cryptanalysis - Part 1/2

Cryptanalysis is the study of ciphers or ciphertexts to find weaknesses in them, which will let/permit the attacker to retrieve the plaintext from the ciphertext (without necessarily knowing the key). 445 more words