The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 2021
Filed:
May. 02, 2018
Amazon Technologies, Inc., Seattle, WA (US);
Shay Gueron, Haifa, IL;
Matthew John Campagna, Bainbridge Island, WA (US);
Amazon Technologies, Inc., Seattle, WA (US);
Abstract
Plaintext data is encrypted and decrypted using a symmetric encryption algorithm that generates a sequence of pseudorandom values from a cryptographic key. A portion of the sequence of pseudorandom values is discarded. For example, in an embodiment, each value in the sequence of pseudorandom values is truncated by a number of bits. Encryption and decryption is performed by combining plaintext or ciphertext with the truncated sequence of pseudorandom values. In an embodiment, the combination is made by performing a bitwise exclusive or operation between the truncated pseudorandom values and the plaintext or ciphertext. In an embodiment, a number of bits discarded from each value is encoded into a message authentication code which is provided with any resulting ciphertext.