Your First XOR

Read this: https://ctf101.org/cryptography/what-is-xor/

Then play around with https://gchq.github.io/CyberChef. Notice that doubling up the XOR shows plaintext...

Decode these:

1. o8qLh8qyj4SLyrKluLijpbjKmpiDhImPmZk=, with key "xena"

As a hint for #1, the ciphertext is base64 encoded, which is often indicated by the = sign at the end.

2. 54 68 69 73 20 69 73 20 61 20 6c 69 74 74 6c 65 20 62 69 74 20 68 61 72 64 65 72 2c 20 62 75 74 20 79 6f 75 20 67 6f 74 20 69 74 2e

3. C*}cff*ho*|oxs*ydokas*~bcy*~cgo&*h.~*C*~bcda*se.-ff*mo~*c~$

I'm not giving you the key to #2... which means it is easily bruteforceable. There are plenty of sites that will help you bruteforce this outside of just Cyberchef.

For 3, I will give the crib that the word "sneaky" is in the text... I think it should help.