Abstract

ALMEIDA ECHEVARRIA, Daymé; RODRIGUEZ AULET, Ramses  and  DOMINGUEZ FIALLO, Ernesto. State of art of re-keying mechanisms in block cipher schemes. RCCI [online]. 2022, vol.16, n.4, pp. 207-232.  Epub Dec 01, 2023. ISSN 2227-1899.

In Cryptography, the amount of data allowed to be encrypted with a single key in an algorithm or encryption scheme is known as the lifetime of the key. This amount must be limited, since the probability of success during the execution of specific attacks increases with the obtaining of a greater number of encrypted data, which leads to their frequent change. To avoid these regular key changes, new variants have emerged in the case of symmetric block cipher schemes that extend the lifetime and are known in the literature as external key change mechanisms, internal and fresh key change mechanisms, depending on where they are used, since they work at the level of protocols, modes of operation or in the encryption algorithm itself. In this work, a bibliographic review was carried out on the state of the art of each of the variants, taking into account the general operation of each one of them, their main characteristics, the most recent designs, the security they provide to encryption and their contribution to encryption key lifetime. The results of the review show the advantages of using each of these mechanisms.

Keywords : Rekeying mechanisms; Block cipher algorithms; internal re-keying; external re-keying; fresh re- keying.

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