![]() ![]() Now, the bottom alphabet is shifted by an arbitrary number of positions. The first step is to write the alphabet down two times.Ī B C D E F G H I J K L M N O P Q R S T U V W X Y Z The classic version uses the capital letters A-Z, but, in principle, an arbitrary alphabet can be used. Caesar used this relatively simple form of ciphering to encipher military messages. The Caesar cipher is named after the Roman military and political leader Gaius Julius Caesar (100 BC – 44 BC). Parser.add_argument("-a", "-alphabet", help="defined alphabet", type=str)Ĭaesar(ssage, args.key, args.alphabet, args.crypt_modus, args.keep_chars, args.blocks_of_five) Parser.add_argument("-ka","-keep-non-alp", help="keep non-alphabet characters", dest="keep_chars", action="store_true") Parser.add_argument("-m", "-message", help="message for encrypt / decrypt", type=str, required=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 for encrypt / decrypt", type=int) # if blocks_of_five is true, append a space after every 5 characters ![]() # if the symbol is not in alphabet then regard block_of_five and b_encrypt New_index = (index - key) % len(alphabet) New_index = (index + key) % len(alphabet) If(b_encrypt): # if text is to be encrypted # if character is in alphabet append to ciphertext
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