Any other password would produce nothing but gibberish when the file was read back. The people receiving the messages would progress through the same series of encoders to decrypt the messages as they arrived. A better code string would result in an even more scrambled result. In one, the letters in the original are shifted ahead mod 26 in the alphabet by an amount equal to the position of some special letter in a code word. Note that character coding and decoding are off-loaded into separate procedures. Here is the output except for the opening message when this program was run. The resulting code is much more difficult to break.
When the letters of the code word are exhausted, they are used again. The pad of encoders might, perhaps be taken from the first lines of a sequence of pages of a popular novel. Punctuation and spaces are encoded, however. That is, for the message: This is called a one-pad system. In one, the letters in the original are shifted ahead mod 26 in the alphabet by an amount equal to the position of some special letter in a code word. Bring the black lantern. CodeString ; VAR max, count: From these clues, it would not take long to decode the message without the key. Or, it could be coded by a a less regular replacement: Here is a brief module designed to test the code above by encoding and then decoding a string. To make the result even more difficult to decode, the entire ASCII set of characters in all could be included in the coding scheme. The people receiving the messages would progress through the same series of encoders to decrypt the messages as they arrived. There are much more sophisticated coding schemes than these, of course, and for very secure messages, enormous computing power is required to decode, and this can only be done by brute force trial-and-error. Even in this version, not all the possible characters are encoded. Each would be used only once, then discarded. The resulting code is much more difficult to break. For even greater security, they might be a set of strings specially chosen to make decoding difficult. To decode, the letters need to be shifted backwards by the same amount as derived from the original code word. A secret agent would enter the field with a set of encoding words or phrases. Cviqk ule fobgk pdoxeur. A frequency analysis of the letters in a longer message would open up its key even more rapidly. Even the number of letters in the encoding scheme would vary from one message to the next in a random fashion. Here is the output except for the opening message when this program was run. Note that if the restriction on coding to and from control characters were removed, the implementation would be easier to run faster fewer computations but the result would not be readable as plain text. The code that follows merely re-implements the library module Substitution. Several more sophisticated methods are available and offer greater security.
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