摘要:
In the field of computer software, obfuscation techniques for enhancing software security are applied to compiled (object) software code. The obfuscation results here in different versions (instances) of the obfuscated code being provided to different installations (recipient computing devices). The complementary code execution uses a boot loader or boot installer-type program at each installation which contains the requisite logic. Typically, the obfuscation results in a different instance of the obfuscated code for each intended installation (recipient) but each instance being semantically equivalent to the others. This is accomplished in one version by generating a random value or other parameter during the obfuscation process, and using the value to select a particular version of the obfuscating process, and then communicating the value along with boot loader or installer program software.
摘要:
Method and apparatus for obfuscating computer software code, to protect against reverse-engineering of the code. The obfuscation here is on the part of the code that accesses buffers (memory locations). Further, the obfuscation process copies or replaces parts of the buffer contents with local variables. This obfuscation is typically carried out by suitably annotating (modifying) the original source code.
摘要:
In the data security field, a data protection process embodied in a computer system or computing device or equivalent and which securely descrambles protected (scrambled) data. The process descrambles the data using a dynamic process employing a set of multi-level trees of deterministic functions to generate a descrambling mask value and recover the descrambled message.
摘要:
In the field of cryptography, such as for a computer enabled block cipher, a cipher or other cryptographic process is hardened against an attack by protecting the cipher key or subkeys by using a masking process for these keys. The subkeys are thereby protected by applying to them a mask or set of masks to hide their contents. This is especially advantageous in a “White Box” computing environment where an attacker has full access to the cipher algorithm, including the algorithm's internal state during execution. Further, this method and the associated apparatus are useful where the key is derived through a process and so is unknown when the software code embodying the cipher is compiled. This is typically the case where there are many users of the cipher and each has his own key or where each user session has its own key.
摘要:
A method and associated apparatus for use in a data distribution process to allow an untrusted intermediary to re-encrypt data for transmission from an originator to a message receiver without revealing the data (message) or the cipher to the intermediary. This method uses a composition of two ciphers for re-encrypting the message at the intermediary, without revealing the plain text message or either cipher to the intermediary.
摘要:
Disclosed herein are systems, computer-implemented methods, and non-transitory computer-readable storage media for obfuscating code, such as instructions and data structures. Also disclosed are non-transitory computer-readable media containing obfuscated code. In one aspect, a preprocessing tool (i.e. before compilation) identifies in a source program code a routine for replacement. The tool can be a software program running on a computer or an embedded device. The tool then selects a function equivalent to the identified routine from a pool of functions to replace the identified routine. A compiler can then compile computer instructions based on the source program code utilizing the selected function in place of the identified routine. In another aspect, the tool replaces data structures with fertilized data structures. These approaches can be applied to various portions of source program code based on various factors. A software developer can flexibly configure how and where to fertilize the source code.
摘要:
In the fields of data security and system reliability and qualification, this disclosure is of a method, system and apparatus for verifying or authenticating a device to a host using a zero-knowledge based authentication technique which includes a keyed message authentication code such as an HMAC or keyed cipher function and which operates on secret information shared between the host and the device. This is useful both for security purposes and also to make sure that a device such as a computer peripheral or accessory or component is qualified to be interoperable with the host.
摘要:
Disclosed herein are methods for obfuscating data via a modulus operation. A client device receives input data, stores an operation value, performs a modulus obfuscation on the operation value, performs a modulus operation on the operation value and the input data, performs a modulus transformation on the operation value and the input data to obtain client output data, and checks if the client output data matches corresponding server output data. A corresponding server device receives input data, performs a modulus transformation on the input data to obtain a result, performs a plain operation on the result and an operation value to obtain server output data, and checks if the server output data matches corresponding client output data from the client device. The client and/or server can optionally authenticate the client input data and the server input data if the server output data matches the client output data.
摘要:
Disclosed herein are systems, methods, computer readable media and special purpose processors for obfuscating code. The method includes extracting an operation within program code, selecting a formula to perform the equivalent computation as the extracted operation, and replacing the extracted operation with the selected formula. The formula can be selected randomly or deterministically. The extracted operation can be an arithmetic operation or a Boolean operation.
摘要:
Disclosed herein are systems, methods, and computer readable-media for performing data encryption and decryption using a stream or block cipher with internal random states. The method includes splitting the input data into a predetermined number of blocks and processing each block. The processing includes creating sub-blocks, permuting the sub-blocks, replacing bytes using a lookup table, rotating bits, performing expansion and combining sets of bits. The element of randomness employed in this process allows for the same input to yield the same output, with differing internal states.