Add Vigenere Cipher app specification Resolves: N/a See also: N/afeature/vigenere-cipher
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# Vigenere Cipher
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**Tier:** 1-Beginner
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The rate and impact of security breaches in recent years makes it imperative
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that developers understand the methods bad actors use to compromise apps.
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Understanding how an app can be compromised is the first step in coming up
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with effective protection measures.
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One of the easiest ways bad actors can compromise an app is to access
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data that's left unencrypted by the developer. There are a number of strong
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encryption algorithms available to ensure that data is not readable even if
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access is compromised. These include AES, Blowfish, and TripleDES to name a
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few.
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However, these algorithms can be quite complex to implement so the objective
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of this app is to implement a classical encryption algorithm, the Vigenere
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Cipher to learn the basics of how ciphers work.
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### Requirements & Constraints
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- Developers should use only native language features to implement the Vigenere
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Cipher. Libraries are not allowed.
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- Developers should design and implement their own solution using only the
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description of the steps in the Vigenere Cipher algorithm.
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- After successfully implementing this algorithm Developer should ask
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themselves these questions:
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- Would you feel confident encrypting your financial information using the
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Vigenere Cipher? Why?
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- How would you detect that a message had been encrypted using the
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Vigenere Cipher?
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- How would you go about trying to crack this encryption?
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## User Stories
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- [ ] User can see the app window with these components:
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- Plain text message input field
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- Encryption key input field
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- Action buttons - 'Encrypt' and 'Decrypt'
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- Resulting encrypted or decrypted message
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- [ ] User can enter the text to be encrypted in the plain text message input
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field
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- [ ] User can enter the Encryption key the Vigenere algorithm will use to
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encrypt the plain text message.
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- [ ] User can click see see the 'Decrypt' button disabled until the plain
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text has been encrypted.
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- [ ] User can click the 'Encrypt' button to encrypt the plain text message
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- [ ] User can see the encrypted message displayed in the result field.
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- [ ] User can see the 'Decrypt' button enabled after the encrypted message
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has been displayed.
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- [ ] User can click the 'Decrypt' button to decrypt the encrypted message
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and to display its contents in the result field.
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## Bonus features
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- [ ] User can see a 'Compare' button after decryption that compares the
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original plain text message with the decrypted message
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- [ ] User can see an error message if the 'Compare' detects differences
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in the contents of these two fields.
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## Useful links and resources
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- [Bad Actors](http://solutionsreservoir.com/resources/introduction-to-cybersecurity/part-1-cybersecurity-overview)
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- [Vigenere Cypher](https://www.geeksforgeeks.org/vigenere-cipher/)
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## Example projects
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[Vigenere Encryption](https://codepen.io/max1128/pen/VdyJmd)
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