# Encrypting and Decrypting Data Using Javascript

**URL:** <https://community.glideapps.com/t/encrypting-and-decrypting-data-using-javascript/80469>\
**Category:** Ask for Help\
**Created:** [March 4, 2025, 2:49am UTC](https://community.glideapps.com/t/encrypting-and-decrypting-data-using-javascript/80469 "2025-03-04T02:49:29Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Apollo](https://avatars.discourse-cdn.com/v4/letter/a/41988e/32.png) [@Apollo](https://community.glideapps.com/u/Apollo)\
**Post date:** [March 4, 2025, 2:49am UTC](https://community.glideapps.com/t/encrypting-and-decrypting-data-using-javascript/80469/1 "2025-03-04T02:49:29Z")

</div>

I am working on an app that allows users that are not logged in to have an account. The problem is that I need to encrypt and decrypt user data, but I can only encrypt using a very simple algorithm at the moment using this javascript:

```auto
let letters = 'abcdefghijklmnopqrstuvwxyz'.split(''); 
let letters2 = (p2 + 'abcdefghijklmnopqrstuvwxyz'.slice(0,-p2.length));
var encrypted = [];
for (i=0;i<p1.length;i++) {
encrypted.push(letters2[letters.indexOf(p1.toLowerCase()[i])])
}

for (i=0;i<p2.length;i++) {
encrypted.push(letters2[letters.indexOf(p2.toLowerCase()[i])])
}

return encrypted.join('');

```

p1 is the data as a string that is being encrypted and p2 is the key that the data is being encrypted with.

How can I reverse this, so I can decrypt the data in the most efficient way possible?

---

<div class="post-metadata">

**Author:** ![MaximeBaker](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/maximebaker/32/80877_2.png) [@MaximeBaker](https://community.glideapps.com/u/MaximeBaker)\
**Post date:** [March 4, 2025, 12:56pm UTC](https://community.glideapps.com/t/encrypting-and-decrypting-data-using-javascript/80469/2 "2025-03-04T12:56:58Z")

</div>

Be aware that this method is not secure. Data residing in Glide is still downloadable, and using a JavaScript column for “encrypt/decrypt” won’t change that, unfortunately.

To prevent data from being downloaded by the wrong people, you must use [Row Owners](https://www.glideapps.com/docs/essentials/security-and-user-data/row-owners).