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Help me decode a string if I know the input and the output

My task is for educational purposes, and I have been offered the challenge from a friend, however, I'm stuck on this question:

This task may be fun for some folks. But basically, I think it's AES.

The input: G9S4DZ2 or 35419946942 (which is just base10 of first variable)

output:

OTAwSEt5SitUU3F2YnlhTk5wSEpYQT090

which is base64 for: 900HKyJ+TSqvbyaNNpHJXA==

From there, I have no idea what the encryption type is :(

Skills: Web Security, Python, C Programming, JavaScript

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About the Employer:
( 68 reviews ) Brooklyn, United States

Project ID: #28994911

3 freelancers are bidding on average $93 for this job

mbilal4

Hello, I am expert Programmer having 5+ years experience. I am ready to help you with it. Please contact me. Thank you Regards, Bilal

$130 USD in 2 days
(39 Reviews)
5.0
harfarooqi

Hi Interesting. Let me give a try. It is some encoding scheme used. It can be AES but we need to check Best

$50 USD in 7 days
(6 Reviews)
3.0
elregresodejosec

Hello, It's very easy job I can decode from your input and output data I'm ready to start right now Please contact me Best Jose

$100 USD in 7 days
(2 Reviews)
2.6