A digital cryptograph and encryption process encrypts and transmits in a digital
format specific items of information requested by a user of a digital content transmission
system by using key information, a user's key and a temporary validation key, to
decrypt and replay the encrypted digital information at the user's terminal by
using the key information and the user's authorization information. Each registered
subscribing user is provided with unique key information. The user key is generated
by applying the key information to a key generation algorithm. The temporary validation
key that is created when the registered user accesses the server, is encrypted
with the user key. The digital information is encrypted by using the temporary
validation key in an encryption algorithm. The decryption algorithm allows the
user to decrypt and replay the encrypted digital information upon receipt of the
key information that has a one-to-one correspondence to the identity characters
of the registered subscribing user.
