3 ms·
What's the impact on AES-NI specifically? If hardware AES is impacted and no microcode updates are coming, this would be bad news. Assuming ChaPoly needs expen
by rdpintqogeogsaa 4y ago
What's the impact on AES-NI specifically? If hardware AES is impacted and no microcode updates are coming, this would be bad news.
Assuming ChaPoly needs expensive masking mitigations and AES-NI is safe, ChaPoly just became a lot less attractive, too.
- adrian_b 4y agoNeither AES-NI nor ChaPoly can be influenced by this vulnerability, because they do not use the secret key with different kinds of instructions, that might consume different powers. The secret key is used only in XOR operations. Other secret state of the ciphers is also used only in simple operations, e.g. XOR, additions and rotations, where there is very little variation of the power consumption depending on the operand values. The cryptographic algorithms that have chances to be influenced are those based on public keys, which compute arithmetic operations with large numbers that can cause changes in the clock frequency.