CODEWITHSUNDEEP
python
Leslie
Leslie

Reputation: 31

Binary string length 8 to ASCII

For my beginners course Python I got the following assignment:

Write a program that decrypts messages in the following format:

<encryption_algorithm>:<key>:<message>

Example: caesar:42:01110010 10001111 10010110 10010110 10011001

The messages are encoded as binary strings with length 8 and have to be converted to ASCII. The messages can use Caesar and Vigenère encryption logarithms. It is not allowed to use the built-in functionality int(n,2). Tips: use string.split() when reading the input file. Start by parsing the input file.

I actually don't know where to start. Writing a function to convert binary in to decimals and vice versa? Write a Caesar decrypt and encrypt code?

Upvotes: 0

Views: 192

Answers (1)

Beno&#238;t P
Beno&#238;t P

Reputation: 3265

I am not going to do the assignment for you but what I can do is give you a hint:

01110010 is 0 * 2**0 + 1 * 2**1 + 0 * 2**2...

Each bit needs to be multiplied by the appropriate power of 2, just like base 10:

1234567 is 7 * 10**0 + 6 * 10**1 + 5 * 10**2

You probably need a loop, but before that, you need to use the hint given in your assignment... You can use help(str.split) if you have a problem with that

Upvotes: 1

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