Two kinds of contemporary developments in cryptography are examined. Widening applications of teleprocessing have given rise to a need for new types of cryptographic systems, which minimize the need for secure key distribution channels and supply the equivalent of a written signature. This paper suggests ways to solve these currently open problems. It also discusses how the theories of communication and computation are beginning to provide the tools to solve cryptographic problems of long standing.

that it is possible to improve the complexity of the attack by using a quadratic equation. Following this, a new type of linear distinguishing attack is applied to the NLS stream cipher. This attack demonstrates that a linear attack can be extended to stream ciphers based on a nonlinear shift register and a nonlinear

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Abstract. We present a detailed security analysis of the CAESAR can-didate Ascon. Amongst others, cube-like, differential and linear crypt-analysis are used to evaluate the security of Ascon. Our results are practical key-recovery attacks on round-reduced versions of Ascon-128, where

Abstract. The ongoing CAESAR competition aims at finding authenticated encryption schemes that offer advantages over AES-GCM and are suitable for widespread adoption. At the moment, 50 remaining first-round submissions go through an intensive review, analysis and comparison process. While

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practical forgery and state recovery attack on

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Abstract. In this article, we analyse the security of the authenticated encryption mode JAMBU, a submission to the CAESAR competition that remains currently unbroken. We show that the security claims of this candidate regarding its nonce-misuse resistance can be broken. More precisely, we explain a