[Cryptography] let's kill md5sum!

[Russ Nelson]

Zooko Wilcox-OHearn writes:
 > The time has come to kill off md5sum. Here's the letter I wrote to the
 > GNU coreutils project advocating replacing md5sum with b2sum (BLAKE2)

Fix first problems first:

nelson at d2:~$ cat /etc/issue
Ubuntu 14.04.2 LTS \n \l

nelson at d2:~$ b2sum
b2sum: command not found
nelson at d2:~$ sudo apt-get install b2sum
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package b2sum
nelson at d2:~$ 

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