| 14 Jan 2021 |
 @dei6eisu:matrix.org | Redacted or Malformed Event | 07:35:24 |
|  ramdomacc set a profile picture. | 13:06:48 |
 hunter-gatherer | Sorry, I had to step away from my machine for a while (children are a curse on productivity). | 16:46:43 |
| hunter-gatherer | Yes, the XOR key is supposed to increment. Maybe I'll just try with a shorter message. The scope of the challenge is basically this: A challenger gets a small binary dump that has been encrypted along with the disassembly of the function used to encrypt the data. The challenger then has to write their own program/script to decrypt the dump which unlocks the password for the next flag. If that clears things up at all... | 16:50:12 |
| hunter-gatherer | So if I pass a string to encrypt_text() and then pass it back into decrypt_text() and write the outputs to a file in the order (initial string, encrypted, decrypted) I gets this: | 16:53:38 |
| hunter-gatherer | 00000000: 4f6e 746f 2063 6861 6c6c 656e 6765 2074 Onto challenge t
00000010: 6872 6565 2120 5468 6520 7061 7373 776f hree! The passwo
00000020: 7264 2066 6f72 2074 6865 206e 6578 7420 rd for the next
00000030: 6368 616c 6c65 6e67 6520 6973 3a20 6d6e challenge is: mn
00000040: 7177 6a67 7574 6c77 620a 6e4c 574b 0545 qwjgutlwb.nLWK.E
00000050: 4f49 4546 4e42 4a4b 0f44 5940 5651 1416 OIEFNBJK.DY@VQ..
00000060: 6350 5c1a 4b5d 4e4d 482f 3326 6322 2a34 cP\.K]NMH/3&c"*4
00000070: 673c 212f 6b22 2836 3b70 323a 3238 3933 g<!/k"(6;p2:2893
00000080: 393f 3c7a 322f 677e 320e 1015 0903 1012 9?<z2/g~2.......
00000090: 0b1f 0b0a 4f6e 746f 2063 6861 6c6c 656e ....Onto challen
000000a0: 6765 2074 6872 6565 2120 5468 6520 7061 ge three! The pa
000000b0: 7373 776f 7264 2066 6f72 2074 6865 206e ssword for the n
000000c0: 6578 7420 6368 616c 6c65 6e67 6520 6973 ext challenge is
000000d0: 3a20 6d6e 7177 6a67 7574 6c77 62e4 ec8b : mnqwjgutlwb...
000000e0: 6e55 0a nU.
| 16:54:12 |
| hunter-gatherer | * 00000000: 4f6e 746f 2063 6861 6c6c 656e 6765 2074 Onto challenge t
00000010: 6872 6565 2120 5468 6520 7061 7373 776f hree! The passwo
00000020: 7264 2066 6f72 2074 6865 206e 6578 7420 rd for the next
00000030: 6368 616c 6c65 6e67 6520 6973 3a20 6d6e challenge is: mn
00000040: 7177 6a67 7574 6c77 620a 6e4c 574b 0545 qwjgutlwb.nLWK.E
00000050: 4f49 4546 4e42 4a4b 0f44 5940 5651 1416 OIEFNBJK.DY@VQ..
00000060: 6350 5c1a 4b5d 4e4d 482f 3326 6322 2a34 cP\.K]NMH/3&c"*4
00000070: 673c 212f 6b22 2836 3b70 323a 3238 3933 g<!/k"(6;p2:2893
00000080: 393f 3c7a 322f 677e 320e 1015 0903 1012 9?<z2/g~2.......
00000090: 0b1f 0b0a 4f6e 746f 2063 6861 6c6c 656e ....Onto challen
000000a0: 6765 2074 6872 6565 2120 5468 6520 7061 ge three! The pa
000000b0: 7373 776f 7264 2066 6f72 2074 6865 206e ssword for the n
000000c0: 6578 7420 6368 616c 6c65 6e67 6520 6973 ext challenge is
000000d0: 3a20 6d6e 7177 6a67 7574 6c77 62e4 ec8b : mnqwjgutlwb...
000000e0: 6e55 0a nU.
| 16:54:25 |
| hunter-gatherer | I guess I'm still confused on where these extra bytes are coming from. | 16:54:59 |
| @dei6eisu:matrix.org | Redacted or Malformed Event | 18:21:53 |
| hunter-gatherer | yeah, so it is repeated three times. The original, the ciphered, then the ciphered passed back into the decryption function. I guess I just don't fundamentally understand where the bytes 5 bytes before the last 0x0a byte are coming from. | 18:55:15 |
| 15 Jan 2021 |
|  noahaon joined the room. | 04:47:49 |
| @dei6eisu:matrix.org joined the room. | 06:14:45 |
| @dei6eisu:matrix.org left the room. | 06:14:52 |
|  @eledoro:matrix.org joined the room. | 15:24:38 |
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| 18 Jan 2021 |
|  tj-janke joined the room. | 18:38:21 |
|  f changed their display name from fr0x41nk to f. | 20:12:27 |
| f removed their profile picture. | 20:12:42 |
| 19 Jan 2021 |
|  PQCraft joined the room. | 03:57:12 |
| PQCraft | C > C++ | 03:58:19 |
|  Ucuntu joined the room. | 08:35:08 |
| Ucuntu set a profile picture. | 08:36:38 |
| tj-janke set a profile picture. | 10:44:50 |
|  Wolfgang@matrix joined the room. | 15:05:52 |
|  vilran set a profile picture. | 19:09:43 |
|  kosshi changed their profile picture. | 20:04:39 |
