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PudgyTurtle Mode Resists Bit-Flipping Attacks
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PudgyTurtle Mode Resists Bit-Flipping Attacks
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PudgyTurtle Mode Resists Bit-Flipping Attacks
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Journal Article
PudgyTurtle Mode Resists Bit-Flipping Attacks
2023
Overview
Cryptosystems employing a synchronous binary-additive stream cipher are susceptible to a generic attack called ’bit-flipping’, in which the ciphertext is modified to decrypt into a fraudulent message. While authenticated encryption and message authentication codes can effectively negate this attack, encryption modes can also provide partial protection against bit-flipping. PudgyTurtle is a stream-cipher mode which uses keystream to encode (via an error-correcting code) and to encipher (via modulo-2 addition). Here, we describe the behavior of this mode during bit-flipping attacks and demonstrate how it creates uncertainty about the number, positions, and identities of decrypted bits that will be affected.
