[Cryptography] Where should I start with cryptography?

[Anthony Martin]

Jonathan Katz <jkatz at cs.umd.edu> once said:
> Actually, do yourself a favor and buy [1b] instead of [1]. =)
> 
> [1b]
> http://www.amazon.com/Introduction-Cryptography-Edition-Chapman-Security/dp/1466570261/

It's nice to see a second edition. Can you summarize
the differences between this and the first edition?

Thanks,
  Anthony