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A Linearly Independent, Encryption Algorithm Technology
Active Publication Date: 2013-11-20
MORPHO INC
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[0016] However, sometimes attacks succeed in overcoming the difficulties posed by existing masking techniques
In particular, certain kinds of attacks, such as HO-DPA (High-Order Differential Power Analysis) attacks may be particularly difficult to avoid in certain situations
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[0033] Figure 1 shows a schematic overview of the method according to the invention. In this method, the processing starts with masked data CL_TXT (for "clear text"), e.g. in the MSK step for data items to be encrypted; then, the encryption algorithm ALG to be protected (e.g. encryption of AES algorithm); then, the result is finally unmasked (in step U_MSK, for "unmask") in order to recover the value CR_TXT (recovered from "ciphertext" or encrypted text), which is usually without The shielding case is generated by the algorithm ALG. In other words, if the two steps of masking MSK using a linear code and unmasking U_MSK (using the corresponding decoding) are eliminated, only the encryption algorithm ALG remains, and the same output CR_TXT can be obtained from the input CL_TXT, which means The algorithm is made more secure through shielding without compromising its interoperability. In the encryption algorithm, the masking operation MSK is combined with the unmasking operation...
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Abstract
The invention relates in particular to a method for securing the execution of a cryptographic algorithm (ALG) against passive sniffing, the method implementing masking (MSK) of data processed by the cryptographic algorithm. The masking (MSK) of said data includes a linear encoding step such as x'=x.L+c, in which x is the data to be masked, x' is the corresponding masked data, c is a code word included in a linear code C, and L is a matrix made up of linearly independent vectors not included in the linear code C. The invention also relates to a device (SC) implementing such a method.
Description
technical field [0001] The invention relates to the protection of encryption algorithms against passive interception. Background technique [0002] A cryptographic algorithm is an algorithm designed to protect information, for example, by applying mathematical methods to preserve its privacy, authenticity, or integrity. Typically, encryption algorithms are based on one or more keys, which can be secret, private, or public. Some encryption algorithms do not use a key, which is true for some hash functions (such as SHA-1, MD5, SHA-256, RIPEMD-160, etc.). Encryption algorithms include encoding algorithms (which can produce incomprehensible information) and decoding algorithms (which restore original information from encoded information), such as algorithms used for electronic signatures, signature verification, authentication, and verification of authentication. Some key-based encryption algorithms are called symmetric (for example, algorithms DES, 3DES, AES, RC4, HMAC, etc.)...
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