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[Music] in this video we are going to discuss and demonstrate a practical attack against block ciphers operating in electronic codebook or ecb mode as we have seen in detail in a previous video go ahead and check that out now if you havent already ecb is the most basic and easiest to understand block cipher mode of operation a block of plain text encrypted with the same key will always result in the same block of cipher text the order of the blocks doesnt matter same plain text and key same ciphertext block it doesnt matter if you encrypt it once twice or a thousand times the output will always be the same so what exactly can go wrong when the same plain text blocks map to the same predictable ciphertext blocks lets find out but before we do the purpose of these videos is to explain theory for a specific security topic once you understand the theory youll be able to solve relevant capture the flag problems one of the places you can solve these problems is 247ctf.com at the end of