Method and apparatus to implement the data encryption...

Method and arrangement for communication of information

Method and arrangement for generating and checking a security im

Method and circuit apparatus for checking the authorization of a

Method and device for accurately dating an electronic document

Method and device for generating and for validating a digital me

Method and device for limiting the number of authentication oper

Method and device for preventing unauthorized access to a comput

Method and device for qualitative saving of digitized data

Method and device for scrambling and descrambling of a specific

Method and device of increasing the execution speed of cipher fe

Method and device to authorize access to an instrument comprisin

Method and means for combining and managing personal verificatio

Method and means for limiting adverse use of counterfeit credit

Method and means to limit access to computer systems

Method and means to limit access to computer systems

Method and system for a public key cryptosystem having proactive

Method and system for authenticating a computer network node

Method and system for authentication

Method and system for calculating a user account balance in a re