This has been happening for almost a year now. It didn't really matter back then because I didn't play servers that much, but now that I want to play on servers, this is a real problem.

Whenever I try to join a server, it says:
"Internal Exception: java.lang.Error: java.security.NoSuchAlgorithmException: AES Keygenerator not available".

I am running Minecraft version 1.12.2 on Windows 7 (although it didn't work on the pervious computer, which ran Windows 10), I have moved to another country since buying the account (North America to Korea). I have actually tried this on TWO accounts, both of which was bought in America and had no problem with servers. (One of them was able to play servers in Korea, then stopped working. The other one never worked.)

The account(s) is and always was an un-modded, legally bought, Vanilla account. There were no changes made. Not even a map was downloaded.

I actually changed computers since it stopped working, but it won't work on both. I believe it sometimes works, but haven't seen it working for months.

I looked this up and was recommended that I download a new version of java, (latest version and the American version as well) which I did more than I can count, but to no avail.

Once, it yielded a different error: "java.lang.NullPointerException: group". (Screenshot included)

I have deleted and re-installed Minecraft several times since servers stopped working, but nothing changes.

Tried running different Minecraft versions (1.12.2, 1.12.1, 1.12.0). Didn't change anything.

I tried running the Minecraft game output, when I was joining servers it didn't say anything but as soon as I started Minecraft it yielded these errors: (screenshot included below)

07:08:02
game
ScriptEngineManager providers.hasNext(): javax.script.ScriptEngineFactory: Error reading configuration file
<log4j:Event logger="bib" timestamp="1516280882947" level="INFO" thread="Client thread">
<log4j:Message><![CDATA[Setting user: My username here]]></log4j:Message>
</log4j:Event>

07:08:02
monitor
expected <

22:08:04
ni
Errors with built-in recipes!

22:08:04
bid
Skipping bad option: lastServer: