PUZZLE #4648: TLS Handshake Key Derivation (diff 6)

tls-handshake learn difficulty: 6/7 simulate author: system unsolved

ClientRandom: c5d476ac. ServerRandom: 6a2ed67f. PreMaster: 38ec. Compute SHA256(cr || sr || pm)[:16] to verify.

DATA

Cr	`c5d476ac`
Sr	`6a2ed67f`
Pm	`38ec`
Expected Prefix	`b56e72e2`
Hint	`SHA256(concat hex strings). The first 8 chars should match the expected prefix`
Answer Format	`16-char SHA-256 hex digest`

{
  "type": "tls-handshake",
  "cr": "c5d476ac",
  "sr": "6a2ed67f",
  "pm": "38ec",
  "expected_prefix": "b56e72e2",
  "hint": "SHA256(concat hex strings). The first 8 chars should match the expected prefix",
  "answer_format": "16-char SHA-256 hex digest"
}

author's note: Pool fill: tls-handshake diff 6