Most guidelines for implementation of the RC4 stream cipher recommend discarding the \ufb01rst 256 bytes of its output. This recommendation is based on the empirical fact that known attacks can either cryptanalyze RC4 starting at any point, or become harmless after these initial bytes are dumped. The motivation for this paper is to \ufb01nd a conservative estimate for the number of bytes that should be discarded in order to be safe. To this end we propose an idealized model of RC4 and analyze it applying the theory of random shu\ufb04es. Based on our analysis of the model we recommend dumping at least 512 bytes<\/p>\n","protected":false},"excerpt":{"rendered":"
Most guidelines for implementation of the RC4 stream cipher recommend discarding the \ufb01rst 256 bytes of its output. This recommendation is based on the empirical fact that known attacks can either cryptanalyze RC4 starting at any point, or become harmless after these initial bytes are dumped. The motivation for this paper is to \ufb01nd a […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"footnotes":""},"msr-content-type":[3],"msr-research-highlight":[],"research-area":[13558],"msr-publication-type":[193716],"msr-product-type":[],"msr-focus-area":[],"msr-platform":[],"msr-download-source":[],"msr-locale":[268875],"msr-field-of-study":[],"msr-conference":[],"msr-journal":[],"msr-impact-theme":[],"msr-pillar":[],"class_list":["post-145021","msr-research-item","type-msr-research-item","status-publish","hentry","msr-research-area-security-privacy-cryptography","msr-locale-en_us"],"msr_publishername":"Springer-Verlag","msr_edition":"Advances in Cryptology\u2014CRYPTO 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