# Why isn't the maximum security of triple DES 48 * 2 vs 56 * 2?

The security of quadruple or even more encryption isn't much more than that of double encryption. But each round also counts as one encryption. So why isn't triple DES only 96-bits secure?

• how many bits of the 56-bits key is in this 48-bits round key ? Are all the round keys the same ?
– Biv
Apr 21 '17 at 11:32
• The security of quadruple or even more encryption isn't much more than that of double encryption.: how do you come to that conclusion? Apr 21 '17 at 14:50
• @poncho from reading eprint.iacr.org/2014/016.pdf I may have read this wrong. May 31 '17 at 17:22