mirror of https://github.com/dirtbags/moth.git
122 lines
2.9 KiB
Plaintext
122 lines
2.9 KiB
Plaintext
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archaeology
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===========
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This is the network archaeology category. Puzzles center around pulling
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something out of a pcap file.
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* Base64-encoded plaintext
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* Image in pcap of HTTP
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* Image in pcap of SMTP
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* Image in pcap of proto b
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* Image in pcap of out-of-order proto b
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* Image in pcap of out-of-order w/NAK proto b
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* Base64-encoded single-byte xor
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* Base64-encoded 4-byte xor
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* Base64-encoded 16-byte xor
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* Image in pcap of 1-byte xor out-of-order w/NAK w/filler proto c
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* Image in pcap of proto d, plus a token in the text
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* Image in pcap of proto e, token in the text, and token in zip file
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proto b
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-------
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01 1 octet SOH
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xxxx 2 octets chunk number (monotonically increasing)
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xx 1 octet chunk length
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... <256 octets up to 255 bytes of data
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xx 1 octet checksum (uint8 sum of all data bytes)
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06 1 octet ACK
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xxxx 2 octets chunk number
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00 1 octet length 0
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15 1 octet NAK
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xxxx 2 octets chunk number
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00 1 octet length 0
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04 1 octet EOT
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xxxx 2 octets chunk number
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00 1 octet length 0
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frob
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----
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* srand(0)
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* xor each octet with rand() % argv[1]
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proto c
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-------
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all packets are xored with a per-session randomly-selected key
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offs len description
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---- ---- -----------
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00 2 c0 0c
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02 2 packet length
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04 1 opcode
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05 1 00
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06 data
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opcode desc data
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------ ---- ---------
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01 Hello hostname(cstring), 60 bytes random
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02 NOP ∅
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04 Text Alice in Wonderland
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05 Image part# (2 octets) + data
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proto d
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-------
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all packets are xored with a per-packet randomly-selected key
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offs len description
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---- ---- -----------
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00 1 00
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01 1 opcode
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02 2 packet length
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04 2 sequence number
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06 data
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opcode desc data
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------ ---- ---------
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01 Hello hostname(cstring), 60 bytes random
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02 NOP ∅
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04 Text Alice in Wonderland
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05 Image data
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proto e
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-------
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16-byte xor key, applied to entire packet
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offs len description
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---- ---- -----------
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00 1 opcode
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01 1 compression type (0=none, 1=gzip)
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02 2 packet length
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04 2 sequence number
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06 data
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opcode desc data
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------ ---- ---------
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01 Hello hostname(cstring), 60 bytes random
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02 C2 interactive shell
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04 fopen 1:mode (0=read, 1=write)
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1:fd
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n:path
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05 write 1:fd
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4:offset
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n:data
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06 fclose 1:fd
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08 NOP ∅
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