adfgvx brute force decryptor. decryption based on wordlist and caesar shift of the alphabet, using the fact that space will be the most prevalent letter

adfgvx.py

def encodingDict(scrambledAlphabet):
    adfgvxIndex = ['A','D','F','G','V','X']    
    encodeDict = {}

    for i in range(0,6):
        for j in range(0,6):
            encodeDict[scrambledAlphabet[i*6+j]] = adfgvxIndex[i]+adfgvxIndex[j]
    return encodeDict
        
def DecryptOnSpace(encryptedString,codeWord):
    #constructing then unsorting the columns of text
    codeWord = [letter for letter in codeWord]
    sortedCodeWord = codeWord[:]
    sortedCodeWord.sort()
    encryptedGrid = []
    chunkLength = len(encryptedString) // len(codeWord)
    
    for letter in sortedCodeWord:
        encryptedGrid.append((letter,encryptedString[:chunkLength]))
        encryptedString = encryptedString[chunkLength:]
        
    sortedEncryptedGrid = []
    #unsorting
    for letter in codeWord:
        for i in range(0,len(encryptedGrid)):
            item = encryptedGrid[i]
            if item[0] == letter:
                sortedEncryptedGrid.append(encryptedGrid.pop(i)[1])
                break
            
    encryptedString = ""
    
    #appending to one long string
    for i in range(0,len(sortedEncryptedGrid[i])):
        for j in range(0,len(sortedEncryptedGrid)):
            encryptedString += sortedEncryptedGrid[j][i]
    
    
    #guessing based on most prevalent 2-letter entry
    freqDict = {} 
    for i in range(0,len(encryptedString),2):
        target = encryptedString[i:i+2]
        freqDict[target] = freqDict.get(target,0)+1
        
    adfgvxCalc = {"A" : 0,"D" : 1,"F": 2, "G": 3, "V" : 4, "X" : 5}
    
    bigkey,bigvalue = "",0
    for key,value in freqDict.items():
        if value > bigvalue:
            bigvalue = value
            bigkey = key
    bigint = adfgvxCalc[bigkey[0]]*6+adfgvxCalc[bigkey[1]]
    
    
    
    encodeDict = encodingDict(createCaesar(35-bigint))
    encodeDict = {value:key for key,value in encodeDict.items()}#reverse
    
    
    #actual decrypting
    decryptedString = ""
    for i in range(0,len(encryptedString),2):
        target = encryptedString[i:i+2]
        decryptedString += encodeDict[target]
    return decryptedString
        
    

#Encrypt("Brake me out of jail on the 21st.","R3FLMX7KWQ69D4Y5NOZ STV2EH8AP1ICBGU0","PROGRAMMER")
#Decrypt("GADGVDGVFAAGVDAVGAXAGDGFXGGFDDXADXAAAGXFVGXGXGGVGFDVDDDFVVGVFGFAXFGGXF","R3FLMX7KWQ69D4Y5NOZ STV2EH8AP1ICBGU0","PROGRAMMER")

def createCaesar(num):
    temp = "ABCDEFGHIKLMNOPQRSTUVWXYZ0123456789 "
    return temp[num:]+temp[:num]

def guessDecrypt(encryptedString):
    f = open("cryptastic","r")
    allwords = []
    allwordsdict= {}
    for line in f:
        line = line.rstrip("\n\r\t").upper()
        if len(line)>2:
            allwords.append(line)
            allwordsdict[line.replace("J","I")] = 1

    biggestcount = 0
    biggesttext = ""
    for word in allwords:
        decrypted = DecryptOnSpace(encryptedString,word)
        count = 0
        for wordie in decrypted.split(" "):
            count += allwordsdict.get(wordie,0)
        if count > biggestcount:
            biggestcount = count
            biggesttext = decrypted
            print(word)
            print(count)
            print(biggesttext) 
            print("\n")
        
        
    
guessDecrypt("VGVFFDXFAAVVXGAFAVAAGFAVAFAGVGXXAAVFGVAXGGVVGGXFGVGDVGXGVAGGGDXDVFGFAFVGGVAGGFGDGFAXGAGAXGVGAAGDGFXDXVAGVVAXGVGVGFVVAGXDVDGAGDGFXVGXAXGGXGVXGVVDGDGGXDADGGVGAVAGGDXDXVGGGVGXGFXFXFGVXXAFGDGXDAXXAGVFVVAVVGGVDVXAXAFDGVDXVAAVXAFVFGVAXVFADDAVFAFGVGVGFDVADVDVVXGXGGDVGXGVFGGAVADAFVFAGGFXXGFGVXFVFXAVFGFAFGVGFAVAAVFGFVAAVVVGDVAAXVGXDGDGGAGVDVGXDAXADGXGGADGFAFXGXVXVVVAFXXVFVVAAGVXXGGXADGAGFXFGFAGVFVVAFADXDGGGDGXAFADGDAFVDGFVGAGGXGFXDXGGFXXAGADXXAVXFXFAAXGVVAGVFVVVGVFDDVGDFVGXFXDXFDXVGVGAVXDDFAFVFDGVFGFGDGGVGXGVFAFGFVGVXVGVGXFVVXGGDAXGFADAXGFVVVFDFAFAFAFVFVGGGDGGFGFVFXXVFADVFXXXFVVXDAFADGFVGGFGGAFXXXGVFGFGDXFAVAFVFXDGVVXXDXFGFXDVXVFXXGXGGAAXFAFGVXFXDAFGFGGGXADVGAGXVGFXFVVGDGDAGVGGGVFVGGXGGVFAGVDXFDXAXGGVDAFAFAFVAGGADXGXDVFXFVGGDAXXFAXXFVVGVVGGFXFXGXGVFADGVDXFXGFXXFVGVFGFAGGGVFVDVFVFGDVGGVAGXXVDGFAAVDGXGFXGVAGFGGGFGGVVGDXGAFXFGVDXAAVFAFVGDGVFADVGVFAVGAXFADGGXFXFGDAVGFXFAGGXXFVGXGAAVGVDAXGAGDXFGXVFVXVFGFVDXAGGXFAGAFXGAVVAADXVXGXXVGXDVXVFXVADXDVAXGFFVDGGVDGVXDGGDDXFVXGDVVGVGDGXAFXFGVAXVFVFXFXDVDVXVFVGGVADVXAGGAXFAGGXAXAFAGXGGXGVXDXGVFVFAVXVVFGVAFAFXFAGDXVGGVAXAGVFAFVVXFXGXFGFAVVFVDGGAFGVAGVXVDAGXGGGGDXFVFAFVFAXGDVGGFAFVFVFAFDXFVFXVVGADXFGVAFGGVFAAVXVDXFGVGFXFAGGGAGVFVGVGGDGXXDGVXGADAVXGVDAFVVGGVGXDGFXGXDXGXGAFXFXVGDGDVFDGADADVFVXADGVAVXAADVGVDAGXAAFAVAGXGVGVFXGVDGDGFAGVFAXXDGVAGVGVXAFVFVFADXFADAXXDVGXFGDAXDDAXGGXGFAVGFDGXXAXVDAGVFGGXFGGXGAGXFVGGXAFVDAGXXXFXVXDXXAVXFXDAFVGVGGGADGGGGADAXGDVDGXVDDXVGAVAGVDVVAFXFVDAGXVGFXFXDGAVXAFVFAFVDVGGVXFVGVDXXGAGAVFVXVGXFXFXFADXGXFGVVVVFXDGFXFXDGDGGGAVFXFAAVGFADVFVDGXGGAGGFXVGFVVVFADXDVXGFVDVGVDVDGVXFXVVDGXAGGGGFVGGGVFXFVDAGGVVVAGXGGDADAVADGDVDXXAGADGXXGGFVGADXFGFVDAGGDVFAGAFXGVGGVVVAFGXGXGGGFVGXGAGXAGDGAVFXDGXVGVVVGVGGVGVXDGDGXVXVDXDAVGDGDXGXGVDVVGFXFXXGDXFGDDDAVXDAAXAGXVFVVAGXDXGXGVFGFVAVXXFGGXFDVXAVDGDAGAGXXXFAXGXVDVFAGADDGXDGDGFVFXGGFAXDXGXVFGFAGGFVVXDGVGDGXGXGGVXGFVVXGVXXVVFVGGFVDGDXGAFGFXFVFAGGFAVADAVGGDDVFXFXGVFXGVXXGXGXGDGXAGXAFGGGGFVFVGAXADGDGVXVAFVFAGAFXGAGGDXXGDGGDGXVVFVDGFGGVAGGGDVXXFXDVVGFXVXVGDVVGFXVGGXFVFAXAFXVGDGXXDVGVGXGAAGGGDAFVFGGGFAGVVGVVXAXAFVDGGGFXGDXGVVVGGVFADGVAGADXDGFVGVGXGXDXAGFGGGGVGXFD")
    

Do you have the cryptastic file ?

GG 😄