![]() ![]() In cryptography, transposition is a cipher where the order of the letters is changed instead of replacing the letters with other symbols as in the substitution cipher.Ĭolumn transposition uses a rectangular arrangement (also called a matrix or grid), consisting of several rows (as many as are necessary to enter the plain text). Print(decrypt_message(ssage, args.key, args.alphabet, args.case_sensitive)) Print(encrypt_message(ssage, args.key, args.case_sensitive, args.remove_spaces_mod, args.replace_char, args.blocks_of_five, args.alphabet)) Parser.add_argument("-m", "-message", help="char for replacement", type=str, required=True) Parser.add_argument('-rc','-replace-char', help="char for replacement", type=str) Parser.add_argument('-rs','-remove-spaces', dest='remove_spaces_mod', action='store_true') Parser.add_argument('-cs','-case-sensitive', dest='case_sensitive', action='store_true') Parser.add_argument('-f','-blocks-of-five', dest='blocks_of_five', action='store_true') Parser.add_argument('-d','-decrypt', dest='crypt_modus', action='store_false') Parser.add_argument('-e','-encrypt', dest='crypt_modus', action='store_true') Parser.add_argument("-k", "-key", help="key to decrypt or encrypt", type=str) Parser.add_argument("-a", "-alphabet", help="alphabet for key and inut-tex", type=str) #get every first,second and so on element from column in matrixĭecrypted_message += empty_matrix #if col is bigger than keylength minus diff it means that in this row is a placeholder on the last rowĮmpty_matrix += cipher #pointer that point on the row to insert char #remove non-alphabetic symbols in message and key # calculate the number of placeholders in the last row # append the columns based on the alphabetic order of the keyĮncrypted_message += "".join(column])Įncrypted_message = list(encrypted_message.replace(' ',''))Įncrypted_message = ''.join(list(chain(* + įor i in range(0, len(encrypted_message), N)])))ĭef decrypt_message(cipher, key, alphabet, b_case_sensitive): Sorted_key = sorted(ems(), key=lambda pair: alphabet.index(pair), reverse=False) # get every nth el and append to a column #if case sensitive is false, then set key to lowercase #escape all regex special characters in alphabet Message = message.replace(' ', replace_char) ![]() Please enter your text here' -key 'Cipher' -alphabet '' -case-sensitive -replace-char ''ĭef encrypt_message(message, key, b_case_sensitive ,b_remove_spaces, replace_char, b_blocks_of_five, alphabet): Python transpostion.py -encrypt -message 'Hello this is a test. ![]()
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