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Welcome to The Next Session by Tom Hacking Course, that is about Cesar Saiful.

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Now the Cesar Saiful basically uses the keys, which encrypt a particular message differently, depending

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on which he is used.

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Now, the key for this is also for basically individuals from zero to twenty five.

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Now, even if a cryptanalysis knows the Cesar Saiful was used, that alone doesn't give them enough

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information to break the cycle.

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Now in this particular session, we would be covering the import statement, how to use it, how to

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use constants before loop the effects and details of statements, the in and out in operators and also

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the find method of the string method.

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Now we would be creating a Caesar cipher program for us in the new window and we would be saving it

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by a particular means.

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This is a cipher, but for this particular program we would need to download the paperclip via modu

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and pasted in the same directory.

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So we will import that particular module indices for the Python program and then later on we'll see

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how to execute it.

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So we will first start by creating the program now or just for your understanding, I will show you

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that we have already downloaded this paperclip, Lopevi, which is a python file, and this file will

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want to import in our currency for the Python program.

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So over here will go for a new file.

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And in this particular file, we will first start by C.

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Import paper clip now is not necessary as it is a Python program itself.

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Now, after this, we would create a string variable which will have a particular message store into

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it, which can be encrypted or the same can be decrypted.

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So we will take the variable name as same as G String, and that's equal to we will give said this is.

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Cesar Saiful program, and this is our message now after this.

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We will give or take, which will be also used for encryption also and for decryption also.

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So let us give you a key code that's equal to we give, for example, 30.

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Now, we will give your whether the program will encrypt or decrypt.

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So here we are.

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Giving more type is equal to in single code.

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We are giving the text as encrypted.

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Now this you can either separate are putting it in a comment that says send it to wipe, encrypt or

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decrypt.

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So depending what do you wish to do?

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You you the particular given text in the variable mode type.

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Now after this, we are creating one simple variable.

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We just want to store all these symbols, capital, small keys and numbers, so we will create your

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SI symbols type and that will do anything because we will save

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Popy to our eyes to u, v, w, x, y, z, all in capital Novogen and small for a b c d e f g h i j

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k l m n.

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You are still using w, x, y, z and now one, two, three, four, five six seven eight nine zero

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will give you an exclamation mark, question mark or dot and, and the semicolon.

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OK, so after we have given all the values here now the next thing is we will store the encrypted,

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all the decrypted form of the message and another variable.

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So for that, we will take your said translater SDR, which is initially to blank.

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We are not storing there any values initially.

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Now for the symbol in a particular message, we will run the particular loop and we will check.

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So now here we will run for C, so here will be using the SVM in our MSG string.

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Put the semicolons over for loop starts here.

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Now in this we will check the if condition that if the SVM in our symbols type.

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Another condition over here now we want to create here the volume index and is a single index is equal

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to.

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Symbols type dot find in the as if I am OK now we will perform the encryption or decryption option.

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So over here, so just below this, we will check.

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If so, let's take our more type.

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If that is equal, this is double because I want to check for the equality that if we value in that

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more type, is equal to encrypt.

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If it is encrypted, then we are going to see the translated so translated into X.

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Now that's equal to the owner faqir c.

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S I m index plus the value of.

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Kiko.

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Now, after this, we'll go one step back and go for it.

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If that if the mood type is not equal to encrypt, but it is equal to the decrypt, OK, then we are

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going to see translated into X is equal to our volume index, minus the key.

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OK, now we will handle your wrap around if needed.

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So over here we will go again one step back and will check if over translated into X if it is more than

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equal to the level of using your symbols type.

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Then we will see the translated X is equal to.

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Translated into X minus the lenhoff symbols type, and again, it is if but if you're translated IDEX,

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that is less than zero, then we will see translated into X is equal to.

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Translated IDEX plus Willendorf.

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Symbol's.

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Type, so after this, we will.

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Wants one step back and see translated as is equal to translated are plus symbols type.

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And in bracket, we will give here the index as translated idiots.

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Now, we'll go for the if else, but for the upper if condition.

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And over here we will append the symbol without encrypting or decrypting it.

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So here we'll see.

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Translated as is equal to translated SDR plus the value of your SVM.

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And once we have done this, let's go directly here and we will give your print command and then print.

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We will print the value of translated SDR.

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Now we'll use your paper clip that we use to copy Matau and also be put translated ASDF.

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Now let us save this.

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We will save it as.

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Cesar Saiful thought be right in the.

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Program that is an easy drive, hacking and save it.

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OK, so now to run, this will directly go to run and see run module.

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So this is what we are getting at the encrypted string as when you run the particular program, whatever

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text you have written, it is basically encrypted.

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So the output of the string that is this is a cipher program and this is our message of this particular

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text.

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We are basically encrypting using the key.

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So this is a cipher program.

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Just run automatically copies this encrypted string to the clipboard and you can place it in your email

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or the text file also.

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So as a result, you can easily send encrypted output from a particular program to another program also.

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So now basically to decrypt the message, you can just based the same message that is encrypted over

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here, see in this particular part.

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Let's remove this bastard here, save it, and now we run the model of what mistake did we do?

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We have our mistake and basically we do this or we did not change here from encrypt to the clip, OK?

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Only when we say to decrypt, it will be decrypted.

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So now, if you say decrypt, it is a cipher program and this is our message.

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This is what output we get when we change the value of the message, our variable and the type change

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it to decrypt.

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Right.

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So now basically we come to the importing of module and setting up some variables.

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Now we already have some built-In functions and bitin now some function exist in separate programs called

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modules.

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Modules are basically also your python program that contains additional functions.

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Which program can automatically use them so we can import those modules with an appropriate name.

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That is an import statement which consist of the import keyword, followed by the module.

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Like in this case here we have all that import and the module that is paperclip.

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Right.

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So now over here we are importing this module so that we can call the paperclip taught copy function

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in the particular program.

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So as we are using this code copy, if we don't import this, we are not authorized to use this particular

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statement here.