Is it possible to distinguish the binary content of a gpg-encrypted file from a random blob of data?

I have encrypted the file some_file to be decipherable by some_recipient with:
gpg –encrypt –recipient some_recipient some_file

Which results in a file some_file.gpg.
My question is: is the content of some_file.gpg distringuishable from… Continue reading Is it possible to distinguish the binary content of a gpg-encrypted file from a random blob of data?

What’s the shortest message you need to claim ownership of another message?

Hypothetically, I’d like to demonstrate that I am the owner of a piece of published information. The requirements are the following.

The hash/ characteristic string is compact enough (ideally a few bytes, say 16 or 32.)
It does not expose… Continue reading What’s the shortest message you need to claim ownership of another message?