Stan is a small console application that works on all Unix systems. It is able to generate several statisical information of a stream. A stream can be either standard input or given files. Stan can be used in order to analyse encrypted data or to measure the quality of a pseudo random number generator. There are three types of statistics generated by Stan: - General Statistics General statistical standard values are based on the bytes of the input stream. Stan is able to calculate the mean, the median, the deviation and the chi-squared value of the given stream. - Pattern Statistics It is possible to do pattern analysis up to a specified pattern length. Stan will analyse the patterns inside the stream and output the most used patterns and the range of patterns used. - Bit Statistics By analysing the bit of the given stream and dividing them into run, sequences of the same bit, stan is able to show information that are useful for analysing pseudo random numbers. Stan calculates ratios between run lengths and 0 runs to 1 runs. WWW: http://www.r0q.cx/stan/