Ive logged in a lot of times till i got packets which SEEM to use the same encryption key. (they change everytime)

Those are 4 Login packets, 3 with the same key:

1st Login Name: A, no PW
52 00 91 D0 7C 00 00 00 42 42 42 42 42 42 42 42 6E D8 BF 20 63 39 63 D8 3E 20 B6 77 67 D4 58 A9 CF B4 43 5C 4D FA 86 83 BD 68 39 B3 79 1E 31 CC D0 00 A6 F8 70 49 E3 15 5E 2B CA 21 82 E2 6A DA 02 7E F4 FF 76 96 5F 54 27 8C 56 2C 8B A5 D3 5D BA 73

2nd Login Name: A, no PW
52 00 91 D0 99 00 00 00 42 42 42 42 42 42 42 42 6E D8 BF 20 63 39 63 D8 3E 20 B6 77 67 D4 58 A9 CF B4 43 5C 4D FA 86 83 BD 68 39 B3 79 1E 31 CC D0 00 A6 F8 70 49 E3 15 5E 2B CA 21 82 E2 6A DA 02 7E F4 FF 76 96 5F 54 A7 6D 8E 06 EA 89 1B E7 15 6F

3rd Login Name: B, no PW
52 00 91 D0 60 01 00 00 42 42 42 42 42 42 42 42 6E D8 BF 20 63 39 63 D8 3E 20 B6 77 67 D4 58 A9 CF B4 43 5C 4D FA 86 83 BD 68 39 B3 79 1E 31 CC D0 00 A6 F8 70 49 E3 15 94 66 BD 77 E6 8D 8F 18 AF A7 AE F3 FA B1 8F 93 31 69 6A 5C 6C 93 A9 D9 70 1C

4th Different Encryption Key, Login name: A, no PW
52 00 91 D0 78 00 00 00 53 53 53 53 53 53 53 53 31 1C B6 EC 89 DE ED D5 4A 4A 41 09 6C 69 97 9B 1F CA 37 3F 21 A8 34 44 80 57 4A 30 55 39 25 1E 3B 6D AC EA 99 54 AA 83 DD A6 43 D5 A0 C1 C9 C7 38 C6 CB A8 CD 9C D1 A0 24 F2 41 92 38 CE C0 C4 3C ED


I am trying to decrypt them. but no idea about the length of the encryption key. Im sure its XOR Encrypted. Whenever, i add 4 characters to the login name, the packet increases by 8 bytes, (it only increases after every 4th letter).
Ive tried decrypting with 0x42 as a single number, no result.

Well I will be keep trying and get myself informed about XOR more, but I'd be really happy if Id get any kind of help.

Thanks, Kiruku

(incase this is the wrong section, im sorry)