Shh... Can You Split a Secret?
Bash + coreutils + openssl, 91 bytes

0000000: 63 3d 22 6f 70 65 6e 73 73 6c 20 65 6e 63 20 2d  c="openssl enc -
0000010: 61 65 73 2d 31 32 38 2d 63 74 72 20 2d 4b 20 24  aes-128-ctr -K $
0000020: 28 78 78 64 20 2d 70 73 20 2d 6c 20 31 36 20 2f  (xxd -ps -l 16 /
0000030: 64 65 76 2f 72 61 6e 64 6f 6d 29 20 2d 69 76 20  dev/random) -iv
0000040: 30 22 0a 24 63 3c 24 31 0a 74 72 20 01 2d ff 20  0".$c&lt;$1.tr .-.
0000050: 5c 30 3c 24 31 7c 24 63 3e 26 32                 \0&lt;$1|$c&gt;&amp;2


Takes a filename as argument and splits the secret to STDOUT and STDERR. Input and output are in raw binary format.

Sample run

$ cat input.txt
Bruce
$ bash split input.txt 2&gt; &gt;(xxd -ps &gt;&amp; 2) | xxd -ps
d5725c26aa3b
97002945cf31
$ printf %02x $[0xd5725c26aa3b ^ 0x97002945cf31] | xxd -r -ps
Bruce