In John Siracusa’s excellent article on the future of ebooks (via DF), Siracusa made reference to Cory Doctorow’s now-well-known 2004 lecture to Microsoft Research on why DRM systems always fail. The argument, in a nutshell, is this:
DRM systems are usually broken in minutes, sometimes days. Rarely, months. It’s not because the people who think them up are stupid. It’s not because the people who break them are smart. It’s not because there’s a flaw in the algorithms. At the end of the day, all DRM systems share a common vulnerability: they provide their attackers with ciphertext, the cipher and the key. At this point, the secret isn’t a secret anymore.
Doctorow discussed so many things about cryptography that caught my attention that it was hard to keep track of them all, but among them were:
The characters of Alice and Bob, the two primary players in cryptography scenarios. Generally Alice wants to send a message to Bob only to be thwarted by characters like Eve (an eavesdropper), Mallory (a malicious attacker), and many more. Amazing.
The legal concept of "anticircumvention," a circular law that forbids the circumvention of any copy-protection not meant to be circumvented.
Schneier’s Law, which essentially states that any person can come up with a code so devious that he or she is incapable of breaking it.
Last summer I got about two chapters through Sissela Bok’s extraordinary philosophical treatise on Secrets before I got distracted by more beach-appropriate reading. Time to pick it back up again.
Wikipedia on Steganography: “Steganography is the art and science of writing hidden messages in such a way that no one apart from the sender and intended recipient even realizes there is a hidden message. By contrast, cryptography obscures the meaning of a message, but it does not conceal the fact that there is a message. Today, the term steganography includes the concealment of digital information within computer files.” Includes a number of great examples and links for hiding image within images and texts within images.