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Security of AES after key expansion 4-MB with ECB and CBC

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up vote 2 down vote favorite My question is, how does the security depend or change if I encrypt with AES-128 in total 4-MB of Data? With Electronic Code Book Mode and Cipher Block Chaining Mode ? Does an adversary still need $2^{126}$ tries (like Wikipedia suggests) to guess the key or is it less (which in my opinion it should)? The encrypted data would be a videostream. encryption aes symmetric cbc ecb share | improve this question edited Nov 27 at 13:19 kelalaka 4,092 1 16 35 asked Nov 27 at 13:07