Dragonfly (cryptography)

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Libelle is an undisclosed, symmetrical encryption method of the Federal Office for Information Security .

It is implemented in hardware on a so-called PLUTO chip . The chip allows key lengths of up to 160 bits. The procedure is used in certain versions of SINA-VPN . It is approved by the BSI for the protection of classified information (VS) with the level of secrecy TOP SECRET.

The security philosophy of the BSI requires only unpublished algorithms to be used for processing state classified information with a higher degree of secrecy ( security through obscurity ). In contrast, the security organs of the United States rely on the disclosed procedures of Suite B up to the highest level of secrecy and only use the secret procedures of Suite A for particularly critical systems.

According to the Pluto data sheet, Libelle has (up to?) A key length of 160 bits and works with a 64-bit block size. Pluto supports the cryptographic operating modes ECB , CBC and CFB / OFB with a block size of 1, 8, 16, 32 or 64 bits.

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