.~ Protects transmitted data (e.g., encryption or decryption)
DEFINITION
Classification: 902/2
Protects transmitted data (e.g., encryption or decryption):
(under subclass 1) Subject matter including means to prevent fraudulent use of transaction* information in communication between a terminal and a central processor.
SEE OR SEARCH CLASS
340, Communications: Electrical,
825.34, for selective electrical authentication of communications.
379, Telephonic Communications, appropriate subclass for a device contributing to the security of communication over telephone lines, particularly
32+, for circuitry responsive to an abnormal condition.
380, Cryptography,
9+, for electric signal modification, particularly subclass 24 for such modification wherein a transaction* is authenticated by a user*.
