A cryptography apparatus includes multiple multiplication units and logic circuitry. The multiplication units are arranged in two or more multiplication levels, and are configured to operate in accordance with Galois-Field (GF) arithmetic over respective Galois fields. The logic circuitry is configured to receive input data whose word-size exceeds a maximal input word-size among the multiplication units, to hold a cryptographic key including multiple sub-keys whose number does not exceed a number of the multiplication units, and to perform a cryptographic operation on the input data by applying the sub-keys to the multiplication units.

Technology permitting secure storage and transmission of data stream as well as tiered access to multiple data stream according to permission. Data streams may be encrypted using symmetric encryption performed with varying symmetric keys according to a key stream of symmetric keys. Native data may be discarded for safety. Whole or partial key streams may be encrypted using the public keys of authorized entities having permission to access respective data streams or portions thereof. Only the corresponding private keys can decrypt the encrypted key streams required to decrypt the encrypted data streams. Thus rigorous access control is provided. IT personnel accessing data stream files on a server or intruders maliciously obtaining files will not be able to derive the data stream. Sensitive data streams may be stored using cloud services despite inherent risks.

A method for side-channel attack mitigation in streaming encryption includes reading an input stream into a decryption process, extracting an encryption envelope having a wrapped key, a cipher text, and a first message authentication code (MAC) from the input stream, generating a second MAC using the wrapped key of the encryption envelope, and performing decryption of the cipher text in constant time by determining whether the encryption envelope is authentic by comparing the first MAC extracted from the encryption envelope and the second MAC generated using the wrapped key.

Utilizing a non-repeating identifier to encrypt data, including: receiving a request to write data to a storage device; selecting a segment-offset pair where the data will be stored, where the selected segment-offset pair is unique to every other segment-offset pair utilized during the lifetime of the storage device; and encrypting the data in dependence upon an identifier of the segment-offset pair.

A method of encoding and encrypting input data (D1) to generate corresponding encoded and encrypted data (E2) is provided. The input data (D1) is encoded to generate intermediate encoded data streams. The intermediate encoded data streams include at least one critical data stream that is critical and essential for subsequent decoding of one or more remaining data streams of the intermediate encoded data streams. The at least one critical data stream is encrypted using one or more encryption algorithms to generate at least one intermediate encrypted data stream. Subsequently, unencrypted portions of the intermediate encoded data streams are merged together with the at least one intermediate encrypted data stream to generate the encoded and encrypted data (E2).

In some examples, a non-transitory machine readable storage medium has machine readable instructions to cause a computer processor to segment a datastream into a plurality of equal length blocks each of which has a fixed length, separately encrypt each equal length block using a first encryption key, swap a subset of bits of a first encrypted equal length block with a subset of bits of a second encrypted equal length block such that both of the blocks each have a length equal to the fixed length, and separately encrypt each block using a second encryption key.

Systems and methods for partial frame encryption in accordance with embodiments of the invention are disclosed. In one embodiment, the method receives a video bitstream that includes several frames, each frame including several independently encoded compression units within the frame, encrypts a portion of each of several compression units in several frames, and generates an output bitstream that includes the several independently encoded compression units including the encrypted portions of the compression units.

Methods for a server include defining a starting element and an element step size. A pad mapping is applied to a data Random Cipher Pad (RCP) to obtain a Key RCP using each element of the data RCP once in a predetermined non-sequential order. The starting element and the element step size are combined with the data RCP. The data RCP is encrypted using the Key RCP to produce a subsequent data RCP. The subsequent data RCP is transmitted to another computer. Methods for clients include applying a pad mapping to a data RCP to obtain a Key RCP using each element of the data RCP once in a predetermined non-sequential order to develop the Key RCP. The Key RCP is encrypted using the data RCP to produce a subsequent Key RCP. A data structure is encrypted using the data RCP to produce an encrypted data structure.

Systems, computer-readable media, and methods for improving both data privacy/anonymity and data value, wherein real-world, synthetic, or other data related to a data subject can be used while minimizing re-identification risk by unauthorized parties and enabling data, including quasi-identifiers, related to the data subject to be disclosed to any authorized party by granting access only to the data relevant to that authorized party's purpose, time period, purpose, place and/or other criterion via the required obfuscation of specific data values, e.g., pursuant to the GDPR or HIPAA, by incorporating a given range of those values into a cohort, wherein only the defined cohort values are disclosed to the given authorized party. Privacy policies may include any privacy enhancement techniques (PET), including: data protection, dynamic de-identification, anonymity, pseudonymity, granularization, and/or obscurity policies. Such systems, media and methods may be implemented on both classical and quantum computing devices.

The present invention concerns a method for processing system logs of a computer system. A system log generator (LG) transmits these system logs to a system log analyser (SIEM) after they have been encrypted by means of a symmetric encryption key and sends the symmetric encryption key in parallel with a homomorphic cryptosystem public key. The system log analyser carries out a transcryption of these logs then a processing thereof in the homomorphic domain. The result of the processing in the homomorphic domain is then transmitted to a security centre (SOC) or even directly to the system log generator to be decrypted there. The security centre can establish a security report or propose a countermeasure before sending it, in form encrypted by the symmetric key, to the system log generator.