What is the encryption algorithm here?

Question

Encryption

Hello.
What encryption algorithm can be used in this case?

It was	It became
Plan type	wujkx_r4o3g
Responsible Name	zvli5flx8ull7e376vuym4
Test code works 2	vgvzdfq7utgxdg4e7yxzi
Approval status	0flg8vpxxhu4_vg8e7i4o3ow

Answer 1

6EQUJ5
Seriously, no one except the developers knows what this algorithm is. But it's unlikely that they are stupid enough to use plain XOR or BASE64

Answer 2

So the fact of the matter is that these are not passwords or something secret.
Just attribute names containing Cyrillic. If the name contains only Latin letters, then no encryption occurs.

Answer 3

Can you create new posts? If so, try a chosen plaintext attack, create records with fields like 'a', 'aa', 'aaa', then 'b', 'bb', 'bbb'. Maybe something will clear up (or not).