CRYPTO LAB INC.

Disclosed are an electronic device and a controlling method thereof. In particular, the electronic device includes a memory storing instructions; and a processor configured to execute the instructions, wherein the processor is configured to: obtain a first plaintext matrix and a second plaintext matrix, obtain a first ciphertext matrix by encrypting the first plaintext matrix based on a lattice-based encryption scheme, obtain a second ciphertext matrix by encrypting the second plaintext matrix based on a structure that includes two ciphertext pairs in which each of the two ciphertext pairs includes first-type and second-type matrices, obtain a plurality of decomposed components by decomposing elements in the first ciphertext matrix according to a predefined gadget vector, and obtain an output ciphertext corresponding to a product result between the first plaintext matrix and the second plaintext matrix based on inner-product computations between the plurality of decomposed components and elements in the second ciphertext matrix.

An electronic apparatus is disclosed. The electronic apparatus includes a communication interface, a memory, and a processor. The processor generates a public key and a secret key for homomorphic encryption and stores the generated public key and secret key in a memory, when a user prompt is input, divides the user prompt into tokens in preset units, homomorphically encrypts the tokens using a public key, transmits the tokens to a server device storing an encrypted large language model (LLM), when output data of the encrypted LLM is received, decrypts the output data using the secret key, and when the decrypted data corresponds to a control token, transmits the control token to a server device through a communication interface. Accordingly, various LLM services may be provided while maintaining security.

An electronic apparatus is disclosed. The apparatus includes: a memory storing instructions; a communication interface; and at least one processor including processing circuitry, wherein the at least one processor is configured to obtain a plurality of user data and a plurality of verification random data by replicating user data and verification random data into the plurality of user data and the plurality of verification random data, respectively, when the user data is obtained, obtain a plurality of ciphertext sets by encrypting the plurality of user data and the plurality of verification random data, respectively, under different secret keys, and control the communication interface to transmit the plurality of ciphertext sets to a server.

An electronic device is disclosed. The electronic device includes at least one processor including processing circuitry and memory, the at least one processor configured to obtain a control instruction for generating a one-hot vector with respect to a first ciphertext comprised of a binary vector, obtain length information of the first ciphertext, obtain calculation count based on the length information, obtain a unit vector corresponding to the length information, and generate a second ciphertext indicating a one-hot vector corresponding to the first ciphertext based on the first ciphertext, the length information, the calculation count and the unit vector.

Disclosed are an electronic apparatus and a control method thereof. According to the present disclosure, an electronic apparatus with N-bit hardware architecture includes a memory configured to store a scaling factor, and a processor configured to obtain a homomorphic encrypted message with an M*N-bit word size, and perform an operation on the homomorphic encrypted message using the scaling factor. In this case, the M is an integer of 2 or more, and the scaling factor is composed of M prime numbers.

Provided are a control method of a system for providing results of homomorphic encryption operations to a consumer and a non-transitory computer-readable medium storing instructions for executing the same. The control method includes: generating, by a producer device, a secret key; generating, by the producer device, an encryption key and a set of operation keys from the secret key; obtaining, by the producer device, a homomorphic ciphertext by encrypting plaintext data using the secret key, and transmitting the homomorphic ciphertext and the set of operation keys to a processor device; obtaining, by the producer device, a plurality of divided keys from the secret key, and allocating the plurality of divided keys to a plurality of decryptor devices, respectively; transmitting, by the producer device, the encryption key to a consumer device; encrypting, by the consumer device, input data and transmitting the encrypted input data to the processor device; performing, by the processor device, a homomorphic encryption operation by using the homomorphic ciphertext and the encrypted input data; transmitting, by the processor device, an operation result ciphertext of the homomorphic encryption operation to the plurality of decryptor devices; obtaining, by the plurality of decryptor devices, a decrypted result value from the operation result ciphertext by using the plurality of divided keys; and transmitting, by the plurality of decryptor devices, the obtained result value to the consumer device.

Provided are an electronic device and a controlling method thereof. The electronic device includes: a communication interface; a memory storing instructions; and a processor configured to execute the instructions, wherein the processor is configured to: control the communication interface to transmit an input query to a first server storing a database encrypted using homomorphic encryption based on an encryption key and an operation key corresponding to the encryption key if the user query is input; receive, from the first server through the communication interface, an encrypted retrieval result for at least one document related to the query among a plurality of documents included in the database; perform decryption on the retrieval result based on a decryption key corresponding to the encryption key; control the communication interface to transmit input information including the query and the decrypted retrieval result to a second server providing a large language model; and receive a response to the query from the second server through the communication interface.

Disclosed is an electronic apparatus. The electronic apparatus includes a memory configured to store at least one instruction and store a plurality of categorical data whose values are expressed as a plurality of classes for one category, and a processor configured to execute the at least one instruction to generate the plurality of categorical data into one homomorphic encrypted message, in which the processor is configured to generate a categorical column in which homomorphically encrypted data for each of the plurality of categorical data is located in a plurality of slots, generate mask columns corresponding to each of the plurality of classes to correspond to the number of the plurality of classes, and generate the homomorphic encrypted message by combining the categorical column and the plurality of mask columns.

A ciphertext processing method of an electronic apparatus is disclosed. The method includes storing a plurality of first homomorphic ciphertexts homomorphically encrypted according to a first scheme, and transforming the plurality of stored first homomorphic ciphertexts into a second homomorphic ciphertext according to a second scheme. The transforming comprises generating one third homomorphic ciphertext corresponding to a first region of each of the plurality of first homomorphic ciphertexts, generating one fourth homomorphic ciphertext corresponding to a second region of each of the plurality of first homomorphic ciphertexts, and generating the second homomorphic ciphertext by using the third homomorphic ciphertext and the fourth homomorphic ciphertext, wherein the second region excludes the first region from the entire region.

Provided is an electronic apparatus including: at least one processor including processing circuitry; and a memory storing instructions, wherein the at least one processor is configured to obtain an operation command for performing a first multiplication operation on a first ciphertext matrix and a second ciphertext matrix, obtain a third ciphertext matrix by applying a ciphertext matrix transpose (CMT) algorithm to the first ciphertext matrix, and obtain an operation result corresponding to the operation command by performing a second multiplication operation on a plurality of plaintext matrices based on the second ciphertext matrix and the third ciphertext matrix.