I have been tasked with moving an authentication service from our provider to somewhere else. The code base for the current service is not available to me, but I know these things:
- I have a 65 character plaintext key
- Something labeled a "nonce" with 3 characters and in plain text
- An encrypted string which (possibly coincidentally) begins with the nonce and is 35 characters long.
I have tried many of the googled suggestions without luck. Mostly nobody even mentions using a nonce.
Can anyone give me some idea of what I might want to do to decrypt the string? Nodejs or python would be my tools of choice?