Write Up – JP 8000

Write Up – JP 8000

Challenge Overview

Category: Crypto
Difficulty: Easy
Author: aria

Challenge dengan nama "Japanese And 8000" ini melibatkan multiple encoding layers yang menggunakan Japanese character encoding (CP932), Morse code, dan Base32. Angka "8000" mengacu pada encoding Shift-JIS/CP932 yang menggunakan code points di sekitar range 8000-an dalam hex.

Format flag:

FGTE{...}

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Files Given

1. Encoded Data (JP_8000.txt)

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
(8217 bytes total)

File ASCII text dengan single line panjang berisi Base32-encoded data.

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Key Insight

Multi-Layer Encoding: Base32 → CP932 (Japanese) → Morse Code → Base32 → Unicode Kanji → Byte Shift

Challenge ini menggunakan 6 layer encoding:

1. Base32 decode → Japanese text (CP932 encoding)
2. CP932 decode → Japanese characters yang merepresentasikan Morse code
3. Japanese to Morse → Characters ツ (dash), ト (dot), ー (space)
4. Morse decode → Base32 text
5. Base32 decode → Unicode Kanji characters
6. Byte extraction + shift → Extract low byte dari setiap Kanji, shift -9 → ASCII flag

Analisis:

• Hint "Japanese And 8000" mengacu pada CP932 encoding (Shift-JIS) dan range code points
• Three specific Japanese characters digunakan untuk represent Morse: ツ (-), ト (.), ー (space)
• Final layer menggunakan Unicode Kanji characters dengan low-byte encoding
• Byte shift of -9 applied to get final ASCII

Kesimpulan: Harus decode secara bertahap dengan memahami encoding Jepang dan Morse code mapping.

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Solution Steps

Step 1 – Base32 Decode (Layer 1)

Decode Base32 string awal untuk mendapatkan Japanese text:

import base64

b32 = open("JP_8000.txt", "r", encoding="utf-8").read().strip()
raw = base64.b32decode(b32, casefold=True)

Step 2 – CP932 Decode (Layer 2)

Decode bytes sebagai CP932 (Japanese Shift-JIS encoding):

jp = raw.decode("cp932", errors="strict")

Hasil: Text berisi Japanese characters ツ, ト, dan ー

Step 3 – Japanese to Morse (Layer 3)

Convert Japanese characters ke Morse code:

• ツ → - (dash)
• ト → . (dot)
• ー → (space)

import re

morse = (jp
    .replace("ツ", "-")
    .replace("ト", ".")
    .replace("ー", " ")
)
morse = re.sub(r"\s+", " ", morse).strip()

Step 4 – Morse Decode (Layer 4)

Decode Morse code ke Base32 text menggunakan standard Morse alphabet:

MORSE_TABLE = {
    ".-":"A","-...":"B","-.-.":"C","-..":"D",".":"E","..-.":"F",
    "--.":"G","....":"H","..":"I",".---":"J","-.-":"K",".-..":"L",
    "--":"M","-.":"N","---":"O",".--.":"P","--.-":"Q",".-.":"R",
    "...":"S","-":"T","..-":"U","...-":"V",".--":"W","-..-":"X",
    "-.--":"Y","--..":"Z","-----":"0",".----":"1","..---":"2",
    "...--":"3","....-":"4",".....":"5","-....":"6","--...":"7",
    "---..":"8","----.":"9","..--.-":"_","-.-.--":"!",".-.-.-":".",
    "--..--":",","..--..":"?","-..-.":"/","-...-":"="
}

parts = []
for token in morse.split(" "):
    if token and token in MORSE_TABLE:
        parts.append(MORSE_TABLE[token])

b32_second = "".join(parts)

Step 5 – Base32 Decode Again (Layer 5)

Decode Base32 kedua untuk mendapatkan Unicode Kanji:

unicode_kanji = base64.b32decode(b32_second, casefold=True).decode("utf-8")

Step 6 – Byte Extraction and Shift (Layer 6)

Extract low byte dari setiap Kanji character, kemudian shift -9:

# Extract low byte (& 0xFF)
low_bytes = bytes((ord(ch) & 0xff) for ch in unicode_kanji)

# Shift -9
flag = bytes(((b - 9) & 0xff) for b in low_bytes).decode("ascii")

print(flag)

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Solve Script

#!/usr/bin/env python3
import base64, re

# Step 1: Base32 decode
b32 = open("JP_8000.txt", "r", encoding="utf-8").read().strip()
raw = base64.b32decode(b32, casefold=True)

# Step 2: Decode as CP932 (Japanese Shift-JIS)
jp = raw.decode("cp932", errors="strict")

# Step 3: Japanese characters to Morse code
morse = (jp
    .replace("ツ", "-")  # dash
    .replace("ト", ".")  # dot
    .replace("ー", " ")  # space
)
morse = re.sub(r"\s+", " ", morse).strip()

# Step 4: Morse to text
MORSE_TABLE = {
    ".-":"A","-...":"B","-.-.":"C","-..":"D",".":"E","..-.":"F","--.":"G",
    "....":"H","..":"I",".---":"J","-.-":"K",".-..":"L","--":"M","-.":"N",
    "---":"O",".--.":"P","--.-":"Q",".-.":"R","...":"S","-":"T","..-":"U",
    "...-":"V",".--":"W","-..-":"X","-.--":"Y","--..":"Z","-----":"0",
    ".----":"1","..---":"2","...--":"3","....-":"4",".....":"5","-....":"6",
    "--...":"7","---..":"8","----.":"9","..--.-":"_","-.-.--":"!",
    ".-.-.-":".","--..--":",","..--..":"?","-..-.":"/","-...-":"="
}

parts = []
for token in morse.split(" "):
    if token == "":
        continue
    if token not in MORSE_TABLE:
        raise SystemExit(f"[!] Unknown Morse token: {token!r}")
    parts.append(MORSE_TABLE[token])

b32_second = "".join(parts)

# Step 5: Base32 decode again to get Unicode Kanji
unicode_data = base64.b32decode(b32_second, casefold=True).decode("utf-8")

# Step 6: Extract low byte and shift -9
low_bytes = bytes((ord(ch) & 0xff) for ch in unicode_data)
flag = bytes(((b - 9) & 0xff) for b in low_bytes).decode("ascii")

print(flag)

Output:

FGTE{replace_dash_dot_space_japanes}

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Conclusion

Challenge ini menggunakan 6-layer encoding dengan kombinasi unik:

1. Base32 (standard encoding)
2. CP932 (Japanese Shift-JIS encoding)
3. Japanese characters as Morse (ツ=dash, ト=dot, ー=space)
4. Morse code (International Morse alphabet)
5. Base32 again (second layer)
6. Unicode Kanji + byte shift (low-byte extraction with -9 offset)

Kunci sukses adalah mengenali encoding CP932/Shift-JIS dari hint "Japanese And 8000", mapping Japanese characters ke Morse, dan understanding low-byte extraction dari Unicode characters.

Pelajaran: Dalam multi-layer encoding challenge, perhatikan hints dalam nama challenge. "JP 8000" langsung mengarah ke Japanese encoding (CP932/Shift-JIS uses code points around 0x8000). Always consider cultural encodings seperti Shift-JIS, GB2312, Big5, dll dalam CTF.

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