# Why would a 3DES key decrypt one block, but not the next?

I'm trying to crack an encrypted data stream. It appears to be using a 64-bit 3DES key (as written in the application logs), and in fact using that key does correctly decrypt the first 64-bit packet sent.

Where I'm getting confused, is it absolutely will not decrypt the second one sent.

key = d7 a0 f3 70 82 6c b0 ff
ct1 = 63b8ea10e5ec3424
ct2 = 03b02e2d20b611b2


--

key = 08 aa 25 d5 5e fa 59 55
ct1 = 3794fbb20c2d25c2
ct2 = bfdbd05fedfcc749