A weak key pair is just that, a pair of keys. So a pair of 8 byte keys is 16 bytes.

A weak key pair is just that, a pair of keys. So a pair of 8 byte keys is 16 bytes.

For their example weak keys:

0x011F011F010E010E and 0x1F011F010E010E01

This can be broken down into:

01 1F 01 1F 01 0E 01 0E and 1F 01 1F 01 0E 01 0E 01

The first byte of the first key is 01, the second byte of the first key is 1F, etc.