Anyone good at code breaking?

ON. ;)

This might help you.
Hello = 0032125252632

Google it.
You’re welcome. ;-)

I am fairly decent. I found it in plain-text and pasted it below, but then I decided that it was too easy so I encoded it differently.

IkhlbGxvLiAgSG93IGFyZSB5b3U/ICBJIGFtIGZpbmUuICBXaGF0IGlzIHlvdXIgbmFtZT8gIE15
IG5hbWUgaXMgSmVycnkuIg==

Or put another way,

22 48 65 6c 6c 6f 2e 20 20 48 6f 77 20 61 72 65 20 79 6f 75 3f 20 20 49 20 61 6d 20 66 69 6e 65 2e 20 20 57 68 61 74 20 69 73 20 79 6f 75 72 20 6e 61 6d 65 3f 20 20 4d 79 20 6e 61 6d 65 20 69 73 20 4a 65 72 72 79 2e 22

@worriedguy How do you think I found it?

We have Rules…

3-You can’t use Google, and it makes doing things like this pointless.
7-You can ask online but cannot check answers until A-you have the answer B-the time-frame has elapsed

@worriedguy That’s wrong… HELLO. = 0 03 21 25 25 26 32

Simple frequency analysis should help you crack most substitution ciphers. Even those that use a keystream for further encryption.

Knowing one and two-letter words makes those that use proper spacing a cinch. In this case, 18 has to be either A or I. By the same token, 1822 has limited options, with IS being the most likely.

So how exactly do ciphers like this work? How do you encode\decode something?

@XOIIO It varies from cipher to cipher. Some or simple substitution while others involve a keystream, either pre-generated, output-driven, or (in the case of one-time pads) random. Occasionally they involve obscure patterns known only to the sender and hopefully the intended recipient. Something like, say, the order of the letters on a keyboard.

@coffeenut Have you figured this one out yet?

@jerv 2 days ago…Mostly, but he made a mistake on the last word

03 30 31 31 30 4 32 – what he sent

03 30 13 13 04 32 – what he meant to send

Yeah, for some of what I’ve dealt with, that first 31 would garble the rest of the message. Such are the dangers of output-driven keystreams :/

Assuming it’s a straight substitution cipher (as this one was) though, there are only so many double-letter combinations, so that sort of mistake can also screw you up royally,especially if 31 were the letter L in this one.