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This is a part of cryptopals challenges (cryptopals.org)

Following code performs the "encrypt" operation on the ciphertext obtained from the previous round:

Trying to understand why taking the index of a bytes object returns an int that you can't decode, but a slice returns a bytes object that you can. This seems un-intuitive. When you do the same operation with a string, taking an index at the string position still returns a string.

Working on the Cryptopals challenges, I'm trying to iterate over a byte array to do frequency analysis of an XORed string to count the occurrence of the number of plain text letters. I thought I could do the following, but I'm getting 'int' object has not attribute 'decode' error. From reading the Python docs, that makes sense, a byte array is a mutable sequence of integers, but when testing in the interpreter I was expecting different behavior.

I am trying to create an app where the password is sent into a virtual field, then hashed and stored as a hash. However I keep getting this error:

I have been trying to learn OpenSSL C API. I found the interesting cryptopals challenges page and wanted to try some easy challenge. I took challenge 7, AES ECB: https://cryptopals.com/sets/1/challenges/7

After reading OpenSSL documentation I wanted to do some coding. I copy pasted most of the code below from the OpenSSL wiki page. But somehow I cannot make this work. I tried to google for the error and found that people solved this challenge easily in Python, but found nothing for C.

The input file is encoded in Base64, with newlines. So first what I did was to remove newlines. I did it manually, not programatically, with tr tool.

I've started doing the matasano challenges and decided to do it with just the C PL and the win32 API.

I want to do it this way since I want to get very familiar with the win32 API and the obfuscation/encryption techniques malware authors would use.

I've noticed that the second challenge will require me to use the wide string version of the CryptStringToBinary (=CryptStringToBinaryW) since I can't properly decode the first hex string properly (only 3 characters properly decoded as opposed to the 18 characters in the second given hex string).

Here's the link to the challenge: https://cryptopals.com/sets/1/challenges/2

I've been really struggling for the past few hours trying to convert this to the wide string version but I could not get it to work at all, here's my current code (which works great for the ANSI):

I'm new to python3, I'm getting the following error when trying to print the first_block value below.

I'm working on problem 3(set 1) of the cryptopals challenges (https://cryptopals.com/sets/1/challenges/3)
I've already found the key ('x') and decrypted the message ('Cooking mcs like a pound of bacon') Here is my code:

This is for a modern cryptography class that I am currently taking.

The challenge is the cryptopals challenge 3: Single-Byte XOR Cipher, and I am trying to use python 3 to help complete this.

I know that I am supposed to XOR the string and converted to English. The hex string is "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736" which converts to "806748453371902409051174291875458592743800337585421566549206796642836053682239286" in decimal form.

I have XOR'd this against multiple hex byte combinations (2 hex digits), but I do not know how to convert this into English. Is it just brute force and educated guessing at this point?

I know about ETAOIN SHRDLU, but this hasn't really been that helpful.

Thank you for your time and help.

ADDED: Additionally, I tried Challenge #4 but this code does not seem to work. But it did work for Challenge #3 so I am confused.

Challenge #3 Challenge #4

I'm having trouble decrypting a byte string using the openssl crate. As a heads up this is for the Cryptopals challenges, specifically set 2 problem 2. The text file has been encrypted using AES with CBC mode, but I guess a single block can be decrypted with ECB.

I've already tried decrypting the entire 10.txt file with CBC mode, and I know that works. I've also used the following Python code to verify that ECB decryption of the sames bytes also works.

For Python 3: