cryptohard

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duckerz

Task: Buggy AES-GCM implementation with shared GLOBAL_H across tenants. Solution: Exploit GHASH linearity over GF(2) to recover SECRET_VICTIM via matrix solving, then forge valid tag to decrypt flag.

$ ls tags/ techniques/
authentication_bypassaes-gcmghashgf2_linear_algebramulti_tenant_vulnerability
gcm_tag_forgerygf2_matrix_solveghash_linearity_exploit
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