Adaptive Security of Symbolic Encryption

نویسندگان

  • Daniele Micciancio
  • Saurabh Panjwani
چکیده

We prove a computational soundness theorem for the symbolic analysis of cryptographic protocols which extends an analogous theorem of Abadi and Rogaway (J. of Cryptology 15(2):103–127, 2002) to a scenario where the adversary gets to see the encryption of a sequence of adaptively chosen symbolic expressions. The extension of the theorem of Abadi and Rogaway to such an adaptive scenario is nontrivial, and raises issues related to the classic problem of selective decommitment, which do not appear in the original formulation of the theorem. Although the theorem of Abadi and Rogaway applies only to passive adversaries, our extension to adaptive attacks makes it substantially stronger, and powerful enough to analyze the security of cryptographic protocols of practical interest. We exemplify the use of our soundness theorem in the analysis of group key distribution protocols like those that arise in multicast and broadcast applications. Specifically, we provide cryptographic definitions of security for multicast key distribution protocols both in the symbolic as well as the computational framework and use our theorem to prove soundness of the symbolic definition.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Computational Soundness of Coinductive Symbolic Security under Active Attacks

In Eurocrypt 2010, Miccinacio initiated an investigation of cryptographically sound, symbolic security analysis with respect to coinductive adversarial knowledge, and demonstrated that under an adversarially passive model, certain security criteria (e.g. indistinguishability) may be given a computationally sound symbolic characterization, without the assumption of key acyclicity. Left open in h...

متن کامل

Symbolic Security Criteria for Blockwise Adaptive Secure Modes of Encryption

Symbolic methods for reasoning about the security of cryptographic systems have for some time concentrated mainly on protocols. More recently, however, we see a rising interest in the use of symbolic methods to reason about the security of algorithms as well, especially algorithms that are built by combining well-defined primitives. For this kind of application two things are generally required...

متن کامل

Private-key Symbolic Encryption Schemes

Symbolic encryption, in the style of Dolev-Yao models, is ubiquitous in formal security analysis aiming at the automated verification of network protocols. The näıve use of symbolic encryption, however, may unnecessarily require an expensive construction: an arbitrary-length encryption scheme that is private and non-malleable in an adaptive CCACPA setting. Most of the time, such assumptions rem...

متن کامل

Game-Based Criterion Partition Applied to Computational Soundness of Adaptive Security

The composition of security definitions is a subtle issue. As most security protocols use a combination of security primitives, it is important to have general results that allow to combine such definitions. We present here a general result of composition for security criteria (i.e. security requirements). This result can be applied to deduce security of a criterion from security of one of its ...

متن کامل

OAEP Is Secure under Key-Dependent Messages

Key-dependent message security, short KDM security, was introduced by Black, Rogaway and Shrimpton to address the case where key cycles occur among encryptions, e.g., a key is encrypted with itself. We extend this definition to include the cases of adaptive corruptions and arbitrary active attacks, called adKDM security incorporating several novel design choices and substantially differing from...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2005