Has anyone done a study, assembled a snapshot, of how encryption is actually being used on the Internet at this moment?
So many companies do traffic analysis, the usage share of operating systems, etc., and one imagines that national-level agencies do this too, perhaps in incredible detail, but does any open-source information exist that quantifies the use of cryptographic hashes, asymmetric and symmetric algorithms, cryptographic libraries, etc.--and the services they provide?
Reliable data is certainly available.
Such a study on current use could answer many interesting questions:
How much global message and email traffic is being encrypted all the way through an ISP? With what? How much is GnuPG being used? What cryptographic primitives are actually in decline? What services-- confidentiality, integrity, non-repudiation, availability, non-availability (!), authentication-- are really being requested, and what is their usage share?
Does a detailed, open-source (or compromised) study of global encryption use exist?