What encoding format is this?

I'm trying to edit a (slightly) proprietary format and within one of the files it will encode a connection string.

I have a way to encode my own data with it, so I can reverse engineer it a bit.

ABC123"/3

will encode to

rijcmlqXxEeLA4tSspHg5XfWJiq4w==

and开发者_运维百科

AB120";2

encodes to

rijcmlqiF3LjnFJnYfEi2WvcSoPSg==

Is this a known encoding format? I've tried Base64 and it didn't produce anything useful.

Probably encryption followed by Base64. Many apps encrypt their connection strings.

Write a program that converts both to binary. Scan for similarities that way.

It will be impossible to see patterns that are not exactly 8 bits in ascii.