How we can measure key space in transposition algorithms? Should we specify the method, like rail fence ?
Hopefully the question isn't too broad or off. Basically, are there any practical, and by practical I mean secure enough that a ciphertext only attack is infeasible, key-less cryptosystems? For ...
I have an OpenVPN server and a client that can successfully connect to said server. The traffic over the tunnel is encrypted. The tunnel works quite well. However what is NOT encrypted (cleartext) is ...