PUZZLE #3848: EMV Transaction Cryptogram (diff 3)

emv learn difficulty: 3/7 simulate author: system unsolved

EMV ARQC computation. Application Transaction Counter: 5BCE. ICC Master Key: 52A0847D9F445BE7A66D7B5CEE833777. Derive the transaction cryptogram.

DATA

Atc	`5BCE`
Master Key	`52A0847D9F445BE7A66D7B5CEE833777`
Hint	`ARQC = SHA256(master_key \|\| ':ARQC:' \|\| atc)[:12]. ATC=5BCE, master_key=52A0847D9F445BE7A66D7B5CEE833777.`
Answer Format	`12-char hex string (ARQC derived from ATC + master key)`

{
  "type": "emv",
  "atc": "5BCE",
  "master_key": "52A0847D9F445BE7A66D7B5CEE833777",
  "hint": "ARQC = SHA256(master_key || ':ARQC:' || atc)[:12]. ATC=5BCE, master_key=52A0847D9F445BE7A66D7B5CEE833777.",
  "answer_format": "12-char hex string (ARQC derived from ATC + master key)"
}

author's note: Pool fill: emv diff 3