Patent ID: 6014442
Filing Date: 2000-01-11
Classification: H04L

Abstract:
A decrypting method comprising the steps of:writing plural key information to memory means;reading any one of the key information designated by information in k-bit input data from said memory means, the read key information being read from a key address that is generated by encoding said k-bit input data to form m-bit data and concatenating said m-bit data with n-bit data, wherein k, m and n are integers greater than or equal to one and k is greater than m+n, such that said m+n-bit key address is shorter than said k-bit input data;decrypting said input data on the basis of key information read in the reading step; andinhibiting the writing step when executing periods of said writing step and said reading step overlap each other and write and read addresses are in conformity with each other.