What is the reason behind the non-reversible nature of atob and btoa

Looking for a simple way to obscure answers to quiz questions in Markdown temporarily? The idea is to reveal the answers during the presentation, no need for secure encryption.

Considered using 

atob('message I want to obfuscate')
and letting students use btoa() in their developer tools panel to reverse. But running btoa( atob('one') ) doesn't return 'one' as expected.

Any insight on why this method isn't working for decryption? Open to other JavaScript methods that provide basic encryption/decryption functionality without needing additional libraries. Keeping it beginner-friendly for easy implementation.

javascriptencoding

Answer №1

That is the explanation.

When using Base64 encoding, it's crucial that the length of the output encoded string is divisible by 3. If it isn't, extra padding characters (=) will be added to the end of the output. These additional padding characters are removed during the decoding process.

let word1 = "apple",
  word2 = "banana";

console.log("Original value of word1", word1)
console.log("Decoded word1", atob(word1))
console.log("Encoded word1", btoa(atob(word1)))
console.log("-------------------------------------")
console.log("Original value of word2", word2)
console.log("Decoded word2", atob(word2))
console.log("Encoded word2", btoa(atob(word2)))

Answer №2

It was mentioned by @george that it is necessary to utilize the btoa() function before using the atob() function:

atob( btoa( 'hello' ) )

Answer №3

The concept of btoa is transforming binary data into ascii format, specifically base64 encoding which includes only upper and lowercase letters, numbers, comma, plus, slash, and equal sign for padding at the end. This can be applied to various types of data such as text, images, and audio.

On the other hand, atob reverses this process by converting ascii back into binary data. The input must be a subset of Ascii, typically resulting from a base64 encoded string. The output can then encompass any form of data like text, images, or audio.

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