This book constitutes the thoroughly refereed post conference proceedings of the 20th international workshop on fast software encryption held in singapore march 11 13 2013 the 30 revised full papers presented were carefully reviewed and selected from 97 initial submissions the papers are. Welcome to the home page of the 20th international workshop on fast software encryption this workshop will be held in singapore from the 11th until the 13th of march 2013 news 2014 02 26 the fse 2013 proceedings will appear in lncs volume number 8424 of springer 2013 03 10 rump session deadline is 1530pm on 12 march 2013 singapore time. Paper fast software encryption 20th international workshop fse 2013 singapore march 11 13 2013 revised selected papers. This book constitutes the thoroughly refereed post conference proceedings of the 20th international workshop on fast software encryption held in singapore march 11 13 2013 the 30 revised full papers presented were carefully reviewed and selected from 97 initial submissions the papers are organized in topical sections on block ciphers lightweight block ciphers tweakable block ciphers . Fse 2013 is the 20th anniversary annual fast software encryption workshop for the twelveth year sponsored by the international association for cryptologic research iacr fse 2013 will take place in singapore original research papers on symmetric cryptology are invited for submission to fse 2013 the workshop concentrates on fast and secure primitives for symmetric cryptography including