PHP encrypt and decrypt string to be url friendly [closed]

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I am trying to figure out a way to encrypt a user id number. My idea is to encrypt the id ( between 1 and 5 characters ) in combination with some letters ( like _wordtouse ). The only two requirements are

The crypted version can only contain a maximum of 15 characters
I need to be able to decrypt the string on a different page

The reason for all of this is that i am trying to "hide" user id numbers when someone enters a users profile. So i am trying to find a way to deliver an encrypted version of the user id through the url as a get parameter.

Does anyone have an idea on how to solve this?

At Stack Overflow you are expected to try to write the code yourself. After doing more research if you have a problem you can post what you've tried with a clear explanation of what isn't working and providing a Minimal, Complete, and Verifiable example. I suggest reading How to Ask a good question and the perfect question. Also, be sure to take the tour and read this. — John Conde
– John Conde, Commented May 2, 2017 at 19:50

Jonathan Kuhn · Accepted Answer · 2017-05-02 20:07:25Z

6

I would suggest just using the hashids library which is pretty popular and what many url shortening services use. While it isn't really "encryption", it is likely good enough to hide a user's id number in a url. Example:

$userID = 1234;
$hashids = new Hashids\Hashids('some random secret string');

//encode the user id
$encodedID = $hashids->encode($user_id);

//on the other page, decode the user id
$decodedID = $hashids->decode($encodedID);

answered May 2, 2017 at 20:07

Jonathan Kuhn

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4 Comments

onin Over a year ago

Seems cool, a sample would be nice tho.

Jonathan Kuhn Over a year ago

@NinoŠkopac I did include an example in the answer. There is also quite a lot more information on their own website which I linked to.

onin Over a year ago

I'm sorry, I meant an example of the output.

Anas Naim Over a year ago

I used hashids library in 2 large projects, it's an amazing library!

Community · Accepted Answer · 2017-05-23 12:10:27Z

1

https://stackoverflow.com/a/30189841/1325575 explains this in-depth.

However, the short version, which requires no 3rd party installs:

Use openssl_encrypt for encryption
Use openssl_decrypt for decryption

I'm confident that with those 3 links you're gonna find what you're after.

edited May 23, 2017 at 12:10

CommunityBot

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answered May 2, 2017 at 19:55

onin

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2 Comments

Machavity Over a year ago

If the question has been answered elsewhere you should delete your answer and flag it as a duplicate

Dennis Over a year ago

@Nino Thank you very much.

Community · Accepted Answer · 2017-05-23 12:10:27Z

0

This question was already answered here I believe: Encrypt/Encoding an ID in URL string

But I would like to add that instead of using mcrypt (the project is abandoned) you should use: Libsodium, or defuse/php-encryption or OpenSSL

edited May 23, 2017 at 12:10

CommunityBot

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answered May 2, 2017 at 19:52

lloiacono

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2 Comments

Machavity Over a year ago

If the question has been answered elsewhere you should delete your answer and flag it as a duplicate

lloiacono Over a year ago

@Machavity, the previous answer advices to use mcrypt which is abandoned, that is why I added which alternatives to use IMO

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