Publication

Breaking the IOC Authenticated Encryption Mode

Serge Vaudenay
2014
Conference Papers

Abstract

In this paper we cryptanalyse a block cipher mode of operation, called Input Output Chaining (IOC), designed by Recacha and submitted to NIST in 2013 for consideration as a lightweight authenticated encryption mode. We present an existential forgery attack against IOC which makes only one chosen message query, runs in a small constant time, and succeeds with an overwhelming probability 1 - 3 x 2(-n), where n is the block length of the underlying block cipher. Therefore, this attack fully breaks the integrity of IOC.

Official source

https://infoscience.epfl.ch/entities/publication/ed3cd6c0-a854-4404-8b58-6833c1de8842

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Serge Vaudenay
2014
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/ed3cd6c0-a854-4404-8b58-6833c1de8842

About this result

Related concepts (13)

Block cipher

In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called blocks. Block ciphers are the elementary building blocks of many cryptographic protocols. They are ubiquitous in the storage and exchange of data, where such data is secured and authenticated via encryption. A block cipher uses blocks as an unvarying transformation. Even a secure block cipher is suitable for the encryption of only a single block of data at a time, using a fixed key.

Message authentication code

In cryptography, a message authentication code (MAC), sometimes known as an authentication tag, is a short piece of information used for authenticating a message. In other words, to confirm that the message came from the stated sender (its authenticity) and has not been changed. The MAC value protects a message's data integrity, as well as its authenticity, by allowing verifiers (who also possess the secret key) to detect any changes to the message content.

Digital signature

A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature on a message gives a recipient confidence that the message came from a sender known to the recipient. Digital signatures are a standard element of most cryptographic protocol suites, and are commonly used for software distribution, financial transactions, contract management software, and in other cases where it is important to detect forgery or tampering.