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A breakthrough distinguisher has drastically reduced the security margin of Classic McEliece, dropping key recovery costs from 2^143 to between 2^94 and 2^102 operations. This rapid erosion of confidence prompted Germany's BSI to reverse its recommendation within 55 days, underscoring the critical need for cryptographic agility in post-quantum deployments.

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Quantum key recovery for McEliece now costs 2^94 operations

Quantum ZeitgeistOctober 12, 20264 min read

Classic McEliece security margins collapsed after a new distinguisher revealed key recovery now costs 2^94–2^102 operations, far below the 2^143–2^272 claimed.

The security of Classic McEliece, a widely recommended encryption algorithm, has rapidly eroded following a new attack that reduces key recovery costs from 2^143 to 2^272 bit operations to between 2^94 and 2^102. Germany’s BSI reversed its recommendation of the algorithm in 55 days after the initial findings were published in August 2026, advising against its use in new developments. Key recovery for Classic McEliece now requires between…

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