11 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.

The embodiment of the invention discloses a security activation method, a terminal and network side equipment, and belongs to the technical field of communication, and the security activation method comprises the steps that the terminal sends terminal security capability information to the network side equipment, and the terminal security capability information comprises an identifier of a security algorithm supported by the terminal; the security algorithm comprises a security algorithm of which the grouping length is 256 bits; the terminal receives an identifier of a target security algorithm sent by the network side device, wherein the target security algorithm is one of security algorithms supported by the terminal; the terminal derives a security key according to the identifier of the target security algorithm; and the terminal activates security protection with the network side device according to the target security algorithm and the security key.

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.

This invention discloses a fast, universal key expansion method with good balance, belonging to the field of cryptography. For a 256-bit encryption key, this invention expands the encryption key using only XOR, shift, and S-box operations. Besides possessing excellent balance and other randomness properties, this key expansion method also satisfies the property of lower correlation between round keys, resulting in faster key expansion speed. Depending on the needs of the encryption algorithm, this key expansion method can generate round keys of arbitrarily long lengths. Therefore, this invention is a universal key expansion method applicable to encryption keys of 256 bits and round keys of 128 bits.

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.

The embodiments of the present application belong to the technical field of communications. Disclosed are a security activation method, and a terminal and a network-side device. The security activation method in the embodiments of the present application comprises: a terminal sending terminal security capability information to a network-side device, wherein the terminal security capability information comprises identifiers of security algorithms supported by the terminal, and the security algorithms comprise security algorithms having a block length of 256 bits; the terminal receiving an identifier of a target security algorithm that is sent by the network-side device, wherein the target security algorithm is one of the security algorithms supported by the terminal; on the basis of the identifier of the target security algorithm, the terminal performing derivation to obtain a security key; and on the basis of the target security algorithm and the security key, the terminal activating security protection between the terminal and the network-side device.

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.

The present invention provides a universal fast key expansion method. The method is a universal key expansion method for an encryption key length of 256 bits and a round key length of 128 bits. The input encryption key is expanded through a predetermined number of rounds to generate an output key, namely a round key. The input encryption key of the first round is divided into two consecutive left and right key fragments, each of which is 128 bits in length. The two key fragments are subjected to a bit-by-bit exclusive OR and then a first transformation. The output 128-bit data is then subjected to a second transformation to obtain the output round key of the first round. Starting from the second round, the output round key of the previous round is fed back into NK, and then the output round key of the current round is obtained after the first and second transformations. Through the present invention, the overall balance and randomness of the expanded key are improved, the correlation between keys is reduced, and the speed of generating the expanded key is faster.