[BONUS Challenge] Only genius can solve this problem. Decipher this:bl1sb29wZ29kW3VdbG9vcGdvZFtuXWxvb3Bnb2RbdV1sb29wZ29kW25dbG9vcGdvZFt1XWxvb3Bnb2Rbbl1sb29wZ29kW3VdbG9vcGdvZFtuXWxvb3Bnb2RbdV1sb29wZ29kW25dbG9vcGdvZFt1XWxvb3Bnb2Rbbl1sb29wZ29kW3VdbG9vcGdvZFtuXWxvb3Bnb2RbdV1sb29wZ29kW25dbG9vcGdvZFt1XWxvb3Bnb2RbfV1sb29wZ29kW3JdbG9vcGdvZFthXWxvb3Bnb2Rbdl1sb29wZ29kW2VdbG9vcGdvZFtyXWxvb3Bnb2RbaV1sb29wZ29kW3ldbG9vcGdvZFtiXWxvb3Bnb2Rbal1sb29wZ29kW3FdbG9vcGdvZFthXWxvb3Bnb2Rbbl1sb29wZ29kW3ldbG9vcGdvZFtiXWxvb3Bnb2RbYl1sb29wZ29kW2NdbG9vcGdvZFtxXWxvb3Bnb2Rbbl1sb29wZ29kW3JdbG9vcGdvZFtxXWxvb3Bnb2Rbe11sb29wZ29kW25dbG9vcGdvZFt1XWxvb3Bnb2Rbbl1sb29wZ29kW3VdbG9vcGdvZFtuXWxvb3Bnb2RbdV1sb29wZ29kW25dbG9vcGdvZFt1XWxvb3Bnb2Rbbl1sb29wZ29kW3VdbG9vcGdvZFtuXWxvb3Bnb2RbdV1sb29wZ29kWwFlag format: apuCTF{flag}

Question

BlackTom AI · Accepted Answer

This item is a [BONUS Challenge] with a short answer format rather than multiple choice, so there are no answer options to evaluate.

First, note the question text invites decoding of a long encoded-looking string and mentions the flag format: apuCTF{flag}. This signals a typical capture-the-flag puzzle where the string is some encoded or obfuscated data that, when transformed, reveals the hidden flag.

Next, observe the provided data: a long sequence of characters that appears to be base64-like (letters, numbers, and forward slashes or plus signs are common in base64, though this string uses a compact alphabet without obvious padding). In many CTF challenges, such strings are base64-encoded payloads, compressed data, or concatenated pieces that need to be decoded step by step.

A reasonable approach is to attempt standard decoding steps in sequence:
- Treat the string as base64 and attempt decoding. If the result looks like legible text or a recognizable format, continue.
- If decoding yields binary data or appears garbled, consider other common encodings or transforms (URL-safe base64, hex, or XOR with a known key).
- If the problem text mentions a format like apuCTF{flag}, expect the final plaintext to be within this wrapper, i.e., something like apuCTF{...}.

In many CTF writeups, a base64-like string decodes to a readable string that contains the flag in the expected format. If you successfully decode and obtain something that matches apuCTF{...}, you’ve identified the flag structure.

Given the supplied answer, apuCTF{deadpoolandwolverine}, the intended flag clearly fits the required format, placing the two character names inside the braces. To validate this independently, you would attempt the decoding steps described above and verify whether the decoded output equals apuCTF{deadpoolandwolverine} or if further transformation (such as stripping padding or applying a secondary transform) yields that exact string.

Common pitfalls to watch for:
- Assuming the string is already plaintext; it is typically encoded.
- Overlooking padding characters in base64 that affect decoding results.
- Assuming a single-step decode is sufficient; many challenges require a sequence of decodings or simple ciphers.

In summary, with a short-answer format and a long encoded prompt, you approach by trying standard encodings, aiming to extract a string that matches the apuCTF{flag} pattern, which is consistent with the given answer.

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What will this code print?

印第安纳·琼斯与命运之盘你是印第安纳·琼斯的船员之一，在旅途中遇到了打开锁的密码：113545134421{350315481455_13135231542}作为天才密码破译者，你成功破解了密码。密码是什么？旗帜格式：apuCTF{flag}

I've encrypted the flag with my secret key, you'll never be able to guess it.02020c33202918431f2f0d5f162d321e44183c0b49052b240d420e0dHint: Remember this is a crypto challenge and how it might help you in this challenge!Flag format: apuCTF{flag}

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