John the Ripper,是一个快速的密码破解工具,用于在已知密文的情况下尝试破解出明文的破解密码软件,支持目前大多数的加密算法。如DES、MD4、MD5等。它支持多种不同类型的系统架构,包括Unix、Linux、Windows、DOS模式、BeOS和OpenVMS,主要目的是破解不够牢固的Unix/Linux系统密码。
This book is an introductory text in functional analysis. Unlike many modern treatments, it begins with the particular and works its way to the more general. From the reviews: 'This book is an excellent text for a first graduate course in functional analysis...Many interesting and important applications are included...It includes an abundance of exercises, and is written in the engaging and lucid style which we have come to expect from the author.' --MATHEMATICAL REVIEWS