Cryptographer Matthew Green on an RSA key with d=4: how is that even possible
matthew_d_green · x · 2026-10-21
Cryptographer Matthew Green posted: 'How do you even generate an RSA key with d=4, I ask, not wanting to be told the answer.' A private exponent of d=4 would render RSA trivially broken, implying an absurdly catastrophic implementation bug somewhere — delivered with dry incredulity.
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