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2026-05-10
Crypto
Hard
Raptor Weekly 2 - ECHELON Crypto 3 - 5.1 ; ECHELON
Assembling three named artifacts recovered across five prior challenges, a signing key exfiltrated in four fragments, a C2 handshake key, and a certificate-derived access key. Then computing their HMAC-SHA256 combination to authenticate to the CODEWORD tier.
crypto
hmac
multi-stage
ECHELON