md5

问题 As many will know, one-way encryption is a handy way to encrypt user passwords in databases. That way, even the administrator of the database cannot know a user's password, but will have to take a password guess, encrypt that with the same algorithm and then compare the result with the encrypted password in the database. This means that the process of figuring out the password requires massive amounts of guesses and a lot of processing power. Seeing that computers just keep getting faster and

问题 My understanding is that SSL combines an encryption algorithm (like AES, DES, etc.) with a key exchange method (like Diffier-Hellman) to provide secure encryption and identification services between two endpoints on an un-secure network (like the Internet). My understanding is that SASL is an MD5/Kerberos protocol that pretty much does the same thing. So my question: what are the pros/cons to choosing both and what scenarios make either more preferable? Basically, I'm looking for some

问题 For several cases I would need to create random md5 hashes. Do you know what the best / most secure ways of doing this are? Some use cases Verifying an email address Resetting passwords Some kind of session id used for authentication, instead of password (eg: when someone hits "remember me", I would not like to store the pass in a cookie) Background I know that rand() should not be used for security relevant applications. For that reason I went with: md5( uniqid(mt_rand(),true) ); Now I read

问题 In a sentence, I want to configure JBoss 4.2.2 to use DatabaseServerLoginModule as the login-module for a Web application that is secured via Digest Authentication. The problem I am having is that the passwords fail to validate. I suspect the issue is either in how I've defined the application policy or in how the passwords are stored in the database. Below are all the relevant files. I have a MySQL database with users and roles defined using the following schema: CREATE TABLE SR_USER ( ID

问题 When calculating the md5 sum of large files, I see a single cpu core jump to 100% for however long it takes, leaving all other cores idle. My rudimentary understanding of md5 is the entire process is completely linear, where values are dependent on all previous values read, and there is nothing we can do to make it multi-threaded. Is this true? Or is there a way to break the files into sections, calculate <something> over multiple parts using multi-cores, and then combine those <something>

问题 I'm trying to create unique file names by renaming them using their hashed value in iOS. How can I do that? 回答1: you could achieve this by extending NSString, Try this in your .h: @interface NSString(MD5) - (NSString *)generateMD5Hash @end and this in your .m - (NSString*)generateMD5Hash { const char *string = [self UTF8String]; unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH]; CC_MD5(string, strlen(string), md5Buffer); NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST

问题 md5($password.md5($password)) is this good enough for password hashing? I am not asking for comparing this to something like bcrypt. if it is not secure, tell me why. 回答1: The reason to use a different salt for each user's password is so that an attacker can't take a list of all the hashed passwords and see if any of them match the hash of something easy like "password" or "12345". If you were to use the password itself as salt, then an attacker could calculate md5("12345".md5("12345")) and

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Generate a Hash from string in Javascript/jQuery Can anyone suggest a simple (i.e. tens of lines of code, not hundreds of lines) hash function written in (browser-compatible) JavaScript? Ideally I'd like something that, when passed a string as input, produces something similar to the 32 character hexadecimal string that's the typical output of MD5, SHA1, etc. It doesn't have to be cryptographically secure, just

问题 In borland delphi 7 and even in delphi 2007 everything worked, but in delphi 2009 it just returns the wrong hash! I use wcrypt2 script (http://pastebin.com/m2f015cfd) Just have a look: string : "123456" hash: Delphi 7 : "e10adc3949ba59abbe56e057f20f883e" - real hash. Delphi 2007 : "e10adc3949ba59abbe56e057f20f883e" - real hash too. And... Delphi 2009 : "5fa285e1bebe0a6623e33afc04a1fbd5" - WTF?? I've tried a lot of md5 scripts, but delphi 2009 does the same with all of them. Any help? Thanks.

问题 I want to find md5sum of a file in Linux C, Is there any API where I can send file name to get md5sum of that file. 回答1: There's code here. Also, the openssl libs have md5 functions (from here): #include <openssl/md5.h> #include <unistd.h> int main() { int n; MD5_CTX c; char buf[512]; ssize_t bytes; unsigned char out[MD5_DIGEST_LENGTH]; MD5_Init(&c); bytes=read(STDIN_FILENO, buf, 512); while(bytes > 0) { MD5_Update(&c, buf, bytes); bytes=read(STDIN_FILENO, buf, 512); } MD5_Final(out, &c); for