Caller identification system with encryption

Details Caller identification system with encryption Caller identification system with encryption

1991-03-04

1994-02-22

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 29, 380 30, 380 49, 379 93, 379142, 379201, 379245, H04K 102, H04L 906, H04L 930, H04M 157

Patent

active

052895424

ABSTRACT:
Telephone call identification service that safeguards the privacy of an originating station (calling party), while providing useful identifying information to a destination station (called party), is achieved by an encryption process. The encryption process includes combining the originating number with the telephone number of the destination station to form a message. Thereafter, the message is encrypted using the Data Encryption Standard (DES) or the Rivest, Shamir, Adleman (RSA) encryption algorithm to form ciphertext which is transmitted to the destination station. Using either encryption process, the ciphertext is reversible. A telephone switching office, preferably equipped with an electronic program-controlled switching system, executes the encryption algorithm and safeguards the keys used for encryption and decryption. When reversibility of the ciphertext is deemed to be undesirable, the telephone switching office uses modulo n processing of the ciphertext to render it non-reversible.

REFERENCES:
patent: 3570008 (1971-03-01), Downing et al.
patent: 4405829 (1983-09-01), Rivest et al.
patent: 4551581 (1985-11-01), Doughty
patent: 4582956 (1986-04-01), Doughty
patent: 4924496 (1990-05-01), Figa et al.
patent: 5027387 (1991-06-01), Moll
Federal Information Processing Standards Publication 46, Jan. 15, 1977 Specifications for the Data Encryption Standard.

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