System and method for generating an unpredictable number using a seeded algorithm
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G06Q-099/00
출원번호
US-0306617
(2006-01-04)
발명자
/ 주소
Peart, Lee J
Saunders, Peter D
출원인 / 주소
American Express Travel Related Services Company, Inc.
대리인 / 주소
Snell & Wilmer L.L.P.
인용정보
피인용 횟수 :
29인용 특허 :
993
초록▼
A random number generating algorithm is seeded with an unpredictable number. The seed value is computed by subjecting variable data to a Secure Hashing Algorithm, and truncating the right most, or left most, 16 bytes from the message digest generated. The algorithm generates the unpredictable number
A random number generating algorithm is seeded with an unpredictable number. The seed value is computed by subjecting variable data to a Secure Hashing Algorithm, and truncating the right most, or left most, 16 bytes from the message digest generated. The algorithm generates the unpredictable number by using the seed value as a counter value in the random number generator, and performing a data encryption standard operation. In one exemplary embodiment, the unpredictable number is modified to a predetermined maximum unpredictable number value as determined by the sender and receiver of the unpredictable number.
대표청구항▼
What is claimed is: 1. A method for generating an unpredictable number to facilitate securing a transaction:obtaining, by an Radio Frequency Identification (RFID) reader, variable data;performing, by said RFID reader, a secure hashing algorithm on said variable data to produce a message digest, wher
What is claimed is: 1. A method for generating an unpredictable number to facilitate securing a transaction:obtaining, by an Radio Frequency Identification (RFID) reader, variable data;performing, by said RFID reader, a secure hashing algorithm on said variable data to produce a message digest, wherein the secure hashing algorithm is configured to produce a digest of at least 16 bytes;selecting, by said RFID reader, at least one of a left-most 16 bytes or a right-most 16 bytes of said message digest to form a random 16-byte value;creating, by said RFID reader, said unpredictable number using said random 16-byte value as an input for a seeded pseudo-random number generator;determining, by said RFID reader and based upon at least one of an account issuer or a merchant system, a proposed maximum value for said unpredictable number;truncating, by said RFID reader, said unpredictable number, wherein the result of said truncating is said unpredictable number limited to said proposed maximum value;sending, by said RFID reader, the truncated unpredictable number to an RFID transaction device;receiving, by said RFID reader, a cryptogram from said RFID transaction device, wherein said cryptogram includes the truncated unpredictable number; andsending, by said RFID reader, the truncated unpredictable number and said cryptogram to an account issuer, wherein said account issuer validates said cryptogram and verifies that said cryptogram includes the truncated unpredictable number.
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