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AES
At this time last year, the TLS world was mostly running on RC4-SHA and AES-CBC. The Lucky 13 attack against CBC in TLS had just been published and I had spent most of January writing patches for OpenSSL and NSS to implement constant-time CBC decoding. The RC4 biases paper is still a couple of week away, but it's already clear that both these major TLS cipher suite families are finished and need replacing. (The question of which is worse is complicated.)
La crypto expliquée par des petits dessins