Category: String encryption program

String encryption program

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I am needing a bit of help on my encryption program. Hopefully that makes sense. Here's what i have so far. This works fine and dandy but i'd like to have the lists. Here is a solution, for small letters only. It can easily be modified to handle also capital letters, by adding them to the text strings. As can be seen, the space character is at the same position in both lists. This is not necessary, as any character can be translated to any other.

However if the decrypted or encrypted is not containing unique characters only, the program will break down. First I'll give you exactly what you were looking for and explain what I used and some of the changes that needed to be made to your original code. Here's the code you're looking for while retaining the same flow as what you submitted put above :. I also imported the 'random' module and used this to shuffle the characters in order according to a seed that the user inputs.

As long as this seed is the same on the encryption and decryption end, it will produce the same shuffled list and it should work to encrypt or decipher the same string. Also notice the str around your input choices. Without that, the user had to input '1', rather than 1 to submit a choice without an error. Again, I'm not an expert by any means and there are definitely some fun uses of the kind of program you're aiming for, just trying to point you in the right direction if this is something that you're interested in.For details on how to implement XOR encryption using Go, see this post.

XOR encryption or Exclusive-OR encryption is a common method of encrypting text into a format that cannot be trivially cracked by the average person.

XOR encryption is great for storing things like game save data, and other data types that are stored locally on a users computer, that while not a big deal if they are tampered with, you would like to deter people from doing so.

XOR encryption is also used often as a part of more complex encryption algorithms. The idea behind it is that if you don't know the original character or the XOR encryption key, it is impossible to determine what either one is.

However secure or insecure XOR encryption really is, it has plenty of valid use cases. Any kind of deterrent added to data that you don't want users to tamper with but that they will have easy access to is a prime candidate, so long as security isn't paramount.

The concept is simple, you define a key character, and for every character in the string you want to encrypt, you apply the key. Once you want to unencrypt the encrypted data, you simply go through the string and apply the key again. As you can see, the encrypted string looks like gibberish, and would deter non-technical people from bothering to tamper with the file.

While you can't quite make it unbreakable, you can make it ridiculously hard to brute-force by using multiple keys in a pattern like so:. It doesn't look that much more secure, but the reason for using multiple keys rather than just one, is that for each additional key you use, you effectively double the amount of time it takes to brute force the encrypted string.

Full source in a variety of languages available on GitHub. Blog Contact. We now use the char at index modulos the size of the key array to XOR, rather than the same key for each character to encrypt. Let me know if this post was helpful on Twitter kylewbanks or down below, and follow me to keep up with future posts!Web applications use connection strings to find out what database to interact with which credentials and other configuration.

For example, you can instruct your web application to use X database at the server with For most applications, the connection strings are stored in web. It means your IP address, database name, username, and password are stored as a clear text in a file. It may not be a problem for your Development server but it is definitely a security concern for your Production servers. This is where we need to encrypt these connection strings. There are two scenarios to consider:. The steps below use the default key provider for encryption and decryption.

Looking for a way to test connectivity between IIS server and database? Check this post out: How to test connectivity between a server and Oracle database? In order to make it work, you need to create and use an RSA key along with the RSA key provider so all servers would have the same key to decrypt connection strings. Here are the high-level steps Reference :.In this post, we will learn a very interesting concept from cryptography that is Encryption and Decryption of strings using Python.

Now what are this Encryption and Decryption, Why should you know about them? Well, these are very interesting and are used for security purposes. Now, What is this ciphertext it is nothing but the encrypted text of your given message it is non-understandable but can be only understood after decrypting. Now let us see simple encryption and decryption example and then go for the final implementation Example1: Input Enter the string to encrypt and decrypt: Shravan Enter the Key: 5.

Similarly, the same process is applied on the whole string if you get to the end of the string then you must start from the beginning again. Here is the code for Encryption and Decryption using Python programming language. In the above code, there are two functions Encryption and Decryption we will call them by passing parameters. As there are 26 alphabets. In the code, we will check if the character is uppercase or lowercase using ASCII values and then if it lies in the uppercase values we will rotate it only in uppercase alphabets.

And if it is in lowercase then we try to rotate only in the lowercase only. The logic is that we will go through each character of the string and find if the character is uppercase or lowercase and then suppose if it is uppercase lies in the range of then we shift the characters according to the key and if it exceeds the 90 then we should bring it back from I hope you have understood the code if still, you have any doubts regarding the program feel free to comment down below.

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This site uses cookies: Find out more. Okay, thanks.In this post, we will learn a very interesting concept from cryptography that is Encryption and Decryption of strings using Python. Now what are this Encryption and Decryption, Why should you know about them? Well, these are very interesting and are used for security purposes.

Now, What is this ciphertext it is nothing but the encrypted text of your given message it is non-understandable but can be only understood after decrypting. Now let us see simple encryption and decryption example and then go for the final implementation Example1: Input Enter the string to encrypt and decrypt: Shravan Enter the Key: 5.

Similarly, the same process is applied on the whole string if you get to the end of the string then you must start from the beginning again.

Here is the code for Encryption and Decryption using Python programming language. In the above code, there are two functions Encryption and Decryption we will call them by passing parameters. As there are 26 alphabets. In the code, we will check if the character is uppercase or lowercase using ASCII values and then if it lies in the uppercase values we will rotate it only in uppercase alphabets.

And if it is in lowercase then we try to rotate only in the lowercase only. The logic is that we will go through each character of the string and find if the character is uppercase or lowercase and then suppose if it is uppercase lies in the range of then we shift the characters according to the key and if it exceeds the 90 then we should bring it back from I hope you have understood the code if still, you have any doubts regarding the program feel free to comment down below.

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string encryption program

Okay, thanks.Given a string, the task is to encrypt this string using! While encrypting the message the encrypted format must repeat the symbol as many times as the letter position in Alphabetical order.

string encryption program

Approach: This is a very basic and simple type of Encryption technique and can be done as follows:. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.

string encryption program

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Writing code in comment? Please use ide. Program to print the Diagonals of a Matrix Program to print the Ladder Pattern C program to sort an array in ascending order Count ways to divide C in two parts and add to A and B to make A strictly greater than B Check if its possible to make sum of the array odd with given Operations Program to print the series 1, 9, 17, 33, 49, 73, Explanation: Position of 'A' in alphabetical order is 1 and in String is odd position so encrypted message will have 1 '!

Python3 program to Encrypt the String. Function to encrypt the string. Get the number of times the character. Encrypt the String. This code is contributed by AnkitRai Check out this Author's contributed articles. Load Comments.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up.

I don't have much experience or any experience at all about encryption since I just gave my 9th grade finalsbut I had this idea about an algorithm some time back which would enable the user to encrypt words following an algorithm where the program would follow this process for each letter of the entered word; pseudocode:.

Having narrowed and defined the purpose of this function, it can be implemented much more simply by subtracting the character values:. We probably also want it to raise an exception instead of returning an out-of-bounds value if letter isn't a lowercase letter. Similarly to how I used ord to replace alphabets for finding the index, you can use chr to replace it for generating the character from the index:.

Program to Encrypt a String using ! and @

Instead of making the caller convert the input to and from a list, you could just do it inside the function so you accept a string and return a string. In fact, you don't need to convert anything to a list in the first place, because you can already index a string the same way you index a list! This is the standard convention for Python and it has a practical purpose: if something else imports your module, whatever you put inside that if block won't get executed at import time which is good.

The comment defining all sorts of functions isn't very helpful to the reader; a better use of comments is to explain what each function does! Going to just kinda proofread some of the formatting here -- there are odd spaces and unnecessarily parentheses in some spots. I think it's a nice project. I would say that the main things for you to work on is getting further acquainted with Python's standard library and with standard practices, which is what most of my advice will be surrounding.

Unless I'm misreading, your function position looks like an attempt at recreating list. Your function would then become:. The function range defaults to step-size 1, so writing range start, end, 1 is unnecessary. I would also recommend using a main function for your main loop. Remember that Readability counts.

Walkthrough: Encrypting and Decrypting Strings in Visual Basic

As a toy this is fine, but please do not use it or encourage others to use it for real cryptographic application. It is fun as an exercise, but will not be sufficiently strong to protect you against certain common attacks. In Python, a string is a sequence of one-character strings. So you don't need to represent it as a list of strings, because for your purposes that's what a string already is:.

That said, you can replace the entire thing with string. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. A simple encryption program using Python Ask Question. Asked 17 days ago.

Active 16 days ago. Viewed 1k times. Active Oldest Votes. Eliminate unneeded variables!


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