7 results about "256-bit" patented technology

A method for updating arbitrary length cryptographic keys having a bit length greater than 256 bits by a cryptographic key update system includes transmitting, by a sender, a first transmission to one or more controllers that are part of a vehicle and transmitting, by the sender, a second transmission to the one or more controllers, where the second transmission is a symmetric key encryption under a key encryption key of a concatenation of a plurality of parameters and a new cryptographic key. The sender derives the key encryption key by transforming an authentication key and a bit string of constant values based on an N-bit compression function. The method includes transmitting, by the sender, a third transmission to the one or more controllers that is an N-bit message authentication code under a first message authentication code (MAC) key of a concatenation of the first transmission and the second transmission.

A method for updating an arbitrary length cryptographic key having a bit length greater than 256 bits by a cryptographic key update system includes transmitting, by a transmitter, a first transmission to one or more controllers that are part of a vehicle, and transmitting, by the transmitter, a second transmission to the one or more controllers, wherein the second transmission is symmetric key encryption under a concatenated key encryption key of the plurality of parameters and the new cryptographic key. The transmitter derives a key encryption key by converting a bit string of an authentication key and a constant value based on an N-bit compression function. The method includes transmitting, by the transmitter, a third transmission to the one or more controllers, the third transmission being an N-bit message authentication code concatenated under the first message authentication code (MAC) key of the first transmission and the second transmission.

A method for information transmission, applied to a data frame receiver, includes: receiving a plurality of data frames transmitted continuously; and determining a block ACK message (BA) frame based on a number of the data frames transmitted continuously, wherein the BA frame at least comprises feedback information with a size greater than 256 bits.

In the present invention, an encryption processing unit (11): receives, as inputs, an n-bit plaintext P having at least 256 bits and an m-bit private key K no more than n-bits and having at least 256 bits; repeatedly executes a base function including a non-linear layer and a linear layer and a one-byte unit shuffle operation; and thereby generates an n-bit ciphertext C obtained by encrypting the plaintext P.

The invention provides a smart home anomaly detection system and method, and the system comprises an equipment identification layer module, a verification layer module and an anomaly processing layer module, and also comprises the following steps: S1, generating an equipment unique identifier through a CID-Gen algorithm, and enabling the expression of the equipment unique identifier to be as shown in the specification; in the formula, an SHA-256 hash function is used for converting input of any length into 256-bit fixed-length output, MAC is the last 24-bit of a physical address of equipment and ensures uniqueness of the equipment, and Ts is a UNIX timestamp accurate to microseconds. According to the method, a brand-new safety protection system is constructed through a triple core innovation mechanism, firstly, a hardware-level identification solidification scheme is adopted, and the hardware-level identification solidification scheme is adopted; a global unique identifier is generated based on a space-time composite algorithm CID-Gen, the entropy value of the global unique identifier reaches 256 bits, compared with 122 bits of traditional UUIDv4, the global unique identifier is greatly improved, and a system architecture adopts a layered design and is composed of three modules including an equipment identification layer, a verification layer and an exception handling layer.

A method for updating arbitrary length cryptographic keys having a bit length greater than 256 bits by a cryptographic key update system includes transmitting, by a sender, a first transmission to one or more controllers that are part of a vehicle and transmitting, by the sender, a second transmission to the one or more controllers, where the second transmission is a symmetric key encryption under a key encryption key of a concatenation of a plurality of parameters and a new cryptographic key. The sender derives the key encryption key by transforming an authentication key and a bit string of constant values based on an N-bit compression function. The method includes transmitting, by the sender, a third transmission to the one or more controllers that is an N-bit message authentication code under a first message authentication code (MAC) key of a concatenation of the first transmission and the second transmission.

A method for updating cryptographic keys of arbitrary length with a bit length greater than 256 bits by a cryptographic key update system comprises: transmitting a first transmission by a sender to one or more controllers that are part of a vehicle, and transmitting a second transmission by the sender to the one or more controllers, wherein the second transmission is a symmetric key encryption under a key encryption code consisting of a concatenation of a plurality of parameters and a new cryptographic key. The sender derives the key encryption code by transforming an authentication key and a bit sequence of constant values ​​based on an N-bit compression function.The procedure involves the sender transmitting a third transmission to the one or more controllers, which is an N-bit message authentication code under a first message authentication code (MAC) key from a concatenation of the first transmission and the second transmission.