Possible Duplicate: What do the magic numbers 0x5c and 0x36 in the opad/ipad calc in HMAC do? I'm reading the book Network Security Essentials written by William Stallings. in this book,in ...
Let me ask whether SHA1 is designed to be secure for the following case. You compute each SHA1 of many strings,for example 1 million, where each string is a concatenation of X+Y , where X is secret ...