"This past spring, Juliano Rizzo (@julianor) and I came up with a cryptographic attack on Telegram's MTProto "secret" chat communications which can be performed

"This past spring, Juliano Rizzo (@julianor) and I came up with a cryptographic attack on Telegram's MTProto "secret" chat communications which can be performed in O(2^64) time." Using asymptotic notation without an argument (usually "n") makes me cringe. O(2^64) = O(1)