Method for realizing Magpie encryption and decryption

Abstract

The invention discloses a method for realizing Magpie encryption and decryption. The Magpie cipher algorithm packet length is 64 bits and the secret key length is 96 bits; a substitution-permutation network (SPN) structure is employed and 32 rounds of calculation. The Magpie includes two parts: the calculation portion and the control portion. According to the calculation portion, each round of calculation include six basic calculation modules; and according to the control portion, the 65th-bit binary number to the 96th-bit binary number of the secret key are used as control signals of the Magpie encryption algorithm. The control signals are used for controlling the calculation order of the inter-round module and are decided randomly by corresponding bit values of the secret key, so that the encryption calculation process becomes randomized. During the decryption, a ciphertext and a post-conversion round secret key are inputted instead of inputting a plain text and an initial secret key to carry out decryption. According to the invention, the method of combination of the secret key controlling and decryption is used; and the 65th-bit binary number to the 96th-bit binary number of the secret key are used as control signals of the Magpie encryption algorithm. The method is a novel control way; and the security of the cipher algorithm can be effectively improved.

Description

technical field [0001] The invention relates to the field of cryptographic algorithms in information security technology, in particular to a method for realizing Magpie encryption and decryption. Background technique [0002] In recent years, the Internet of Things has been more and more deeply applied to people's production and life, and the security of the Internet of Things has also attracted everyone's attention. Lightweight cryptographic algorithms suitable for resource constraints in the Internet of Things have been continuously studied in recent years, especially how to apply to resource-constrained smart cards, such as encryption on RFID. The lightweight encryption algorithms that have appeared in recent years include: PRESENT encryption algorithm, PUFFIN encryption algorithm, MIBS encryption algorithm, PRINCE encryption algorithm, LED encryption algorithm, EPCBC encryption algorithm, LBLOCK encryption algorithm, Piccolo encryption algorithm, Klein encryption algorit...

AI Technical Summary

Problems solved by technology

Some of the existing lightweight cryptographic algorithms are too pursuing hardware to achieve less occupied area and reduce the number of algorithm calculation rounds, which leads to relatively poor security of the designed lightweight cryptographic algorithms; some lightweight cryptographic algorithms have complex decryption operations, In the decryption operation process, the encryption operation module cannot be effectively reused, and the key length of some lightweight cryptographic algorithms is too short, which makes it easy to attack

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