SRC = sys.argv[1]
OUT = sys.path[0] + "/../output/" + OUTFILENAME
infile = open(SRC, 'r')
outfile = open(OUT, 'w+')
# provide some output
print("Solving Vigenère cipher " + SRC + " with passphrase \'" + PSWD + "\'")
# get data to decrypt
data = str(infile.read()).lower()
# break source text into as many chunks pswd length, store punctuation data
subsect, punct = chunk(data, len(PSWD))
# get the shift value for each chunk of text
shifts = []
for item in list(PSWD):
shifts.append(ord(item) - LOWERCASE_A_ASCII)
# decrypt subsections
for index, string in enumerate(subsect):
subsect[index] = caesar(string, -shifts[index])
# rebuild full decrypted string
result = unchunk(subsect, punct)
# write result to file, clean up, provide output
outfile.write(result)
infile.close()
outfile.close()
print("Decrypted file path: ./output/" + OUTFILENAME)
PSWD = list(sys.argv[2].lower())
SRC = sys.argv[1]
OUT = sys.path[0] + "/../src/vcipher.txt"
infile = open(SRC, 'r')
outfile = open(OUT, 'w')
# provide some output
print("Encrypting file code/" + SRC + "...")
# get source text from file
srcStr = str(infile.read()).lower()
# convert password to integers for shifting
for index, char in enumerate(PSWD):
PSWD[index] = ord(char) - LOWERCASE_A_ASCII
# break source text into as many chunks as the password has chars
subsect, punct = chunk(srcStr, len(PSWD))
# encrypt subsections
for index, string in enumerate(subsect):
subsect[index] = caesar(string, PSWD[index])
# rebuild full encrypted string
result = unchunk(subsect, punct)
# write result to file, clean up, provide output
outfile.write(result)
infile.close()
outfile.close()
print("Encrypted file path: code/src/vcipher.txt")
# caesar cipher with the given shift character
import sys
sys.path.append(sys.path[0] + "/../lib/")
from cryptotools import caesar
from cryptotools import LOWERCASE_A_ASCII
# check for correct argument list
if len(sys.argv) < 3:
print("Error: arguments should be file to encrypt, then a shift value")
sys.exit()
# define some important things
SHIFT = sys.argv[2]
SRC = sys.argv[1]
OUT = sys.path[0] + "/../src/ccipher.txt"
infile = open(SRC, 'r')
outfile = open(OUT, 'w')
# provide some output
print("Encrypting file code/" + SRC + "...")
# gets a string to encrypt, then performs encryption
srcStr = str(infile.read()).lower()
result = caesar(srcStr, ord(SHIFT) - LOWERCASE_A_ASCII)
# write result to file, clean up, provide output
outfile.write(result)
infile.close()
outfile.close()
print("Encrypted file path: code/src/ccipher.txt")
print("Argument Error! Expected format:\n" +
"python3 breakcaesar.py to_decrypt.txt output_name.txt")
sys.exit()
# define some important things
OUTFILENAME = sys.argv[2]
SRC = sys.argv[1]
OUT = sys.path[0] + "/../output/" + OUTFILENAME
infile = open(SRC, 'r')
outfile = open(OUT, 'w+')
# provide some output
print("Breaking encryption on file " + SRC + "...")
# get data to decrypt
data = str(infile.read()).lower()
# determine shift value
shift = getShift(data)
# provide some output
print("Shift value found: " + chr(shift + LOWERCASE_A_ASCII))
# perform decryption
result = caesar(data, -shift)
# write result to file, clean up, provide output
outfile.write(result)
infile.close()
outfile.close()
print("Decrypted file path: ./output/" + OUTFILENAME)