md5

MD5 collision for known input

由 心已入冬 提交于 2019-12-07 00:23:18
问题 Is it possible to create a MD5 collision based on a known input value? So for example I have input string abc with MD5 900150983cd24fb0d6963f7d28e17f72 . Now I want to add bytes to string def to get the same MD5 900150983cd24fb0d6963f7d28e17f72 . (I know this is possible by bruteforcing and waiting a long time; I want to know if there is a more efficient way in doing this) 回答1: Unitl now no algorithm has been discovered that allows you to find a matching input that will generate a given md5

SHA256 digest in perl

由 99封情书 提交于 2019-12-06 20:01:48
问题 I need to do SHA256 hashing of email addresses and I need the result as a String. I tried the following: use Digest::SHA qw(sha256); my $data = 'swaranga@gmail.com'; my $digest = sha256($data); print $digest; But it prints something like: B/D6i1μû^Þ©Q;¢Þ I need the output as follows: cbc41284e23c8c7ed98f589b6d6ebfd6 The above hash is generated using SHA256 generator of Apache DigestUtils. What am I doing wrong? I am a newbie in perl, so excuse if it is something silly. Thanks. 回答1:

MD5 Hash function in excel?

由 本小妞迷上赌 提交于 2019-12-06 18:41:14
问题 I would like to convert a number of excel cells in my document from a serial number to the MD5 hash of that serial number. Is there a precompiled formula in excel that does that, or is my only option to do VBA. If VBA, how would I do it? 回答1: Some links in the question Password hash function for Excel VBA are now broken. Here is an updated version of the accepted answer on that question : You'll find an implementation for VB and VBScript here: http://web.archive.org/web/20080526064101/http:/

Does any published research indicate that preimage attacks on MD5 are imminent?

由 浪尽此生 提交于 2019-12-06 18:33:32
问题 I keep on reading on SO that MD5 is broken, bust, obsolete and never to be used. That angers me. The fact is that collision attacks on MD5 are now fairly easy. Some people have collision attacks down to an art and can even us use them to predict elections. I find most of the examples MD5 "brokeness" less interesting. Even the famous CA certificate hack was a collision attack meaning that its provable that the party generated the GOOD and EVIL certificates at same time. This means that if the

Convert Base64 encoded md5 to a readable String

由 ♀尐吖头ヾ 提交于 2019-12-06 16:46:21
问题 I have a password stored in ldap as md5 hash: {MD5}3CydFlqyl/4AB5cY5ZmdEA== By the looks of it, it's base64 encoded. How can i convert byte array received from ldap to a nice readable md5-hash-style string like this: 1bc29b36f623ba82aaf6724fd3b16718 ? Is {MD5} a part of hash or ldap adds it and it should be deleted before decoding? I've tried to use commons base64 lib, but when i call it like this: String b = Base64.decodeBase64(a).toString(); It returns this - [B@24bf1f20 . Probably it's a

How do I encrypt this password with MD5 using PHP?

由 本秂侑毒 提交于 2019-12-06 16:13:33
问题 The code below is from a login script, written in PHP. The database that it checks passwords against encrypts the passwords using MD5 however when the login script checks against the database for a password, it is checking the raw password without encryption. I am familiar with the md5() function but how would I incorporate that into the following: <?php session_start(); $username = $_POST['username']; $password = $_POST['password']; if ($username && $password) { $connect = mysql_connect(

how unsafe is to user the md5 password as token in the recover password email?

由 ε祈祈猫儿з 提交于 2019-12-06 14:32:05
问题 i was thinking sending an email with the md5 password as token and check if the email+password are correct before showing the recover password form 1) user enters mail 2) if mail exists, send an email to with it with password as token 3) when user click to link: check if mail and md5 password are correct, if so: 4) show password generator form -EDIT- So how could be safer without adding any column to the user table? 回答1: It's at least theoretically unsafe. See e.g. md5 decoding. How they do

How to XOR md5 hash values and cast them to HEX in postgresql

由 回眸只為那壹抹淺笑 提交于 2019-12-06 14:15:21
What I have tried so far SELECT md5(text) will return text (hex strings) . After that We need to xor them SELECT x'hex_string' # x'hex_string'; But the above results in binary values. How do I again convert them into hex string? Is there anyway to xor md5 values in postgresql and convert this into hexadecimal values again ? Those binary values are in fact of type bit varying , which differs significantly from bytea . bit varying comes with built-in support for XOR and such, but PostgreSQL doesn't provide a cast from bit varying to bytea . You could write a function that does the cast, but it's

bash, md5sum behaves strange

由 谁说我不能喝 提交于 2019-12-06 14:01:17
Why is this different? text="tralala" echo -n $text | md5sum - result: def7d827536761c20f449f69262ff20f echo -n "tralala" | md5sum - result : 7e4ef92d1472fa1a2d41b2d3c1d2b77a what am I doing wrong? I suspect you mistakenly did not provide the -n (output no newline) flag to echo. See sample from my machine below: $ echo tralala | md5sum def7d827536761c20f449f69262ff20f - $ echo -n tralala | md5sum 7e4ef92d1472fa1a2d41b2d3c1d2b77a - $ text="tralala" $ echo $text | md5sum def7d827536761c20f449f69262ff20f - $ echo -n $text | md5sum 7e4ef92d1472fa1a2d41b2d3c1d2b77a - 来源： https://stackoverflow.com

Gravatar for Iphone? How do I generate a hexadecimal MD5 hash?

由 我的未来我决定 提交于 2019-12-06 14:00:19
问题 I'd like to use gravatar in my iPhone application. Is there anyway to generate a hexadecimal MD5 hash in Objective-C for iPhone? Using openssl on iPhone is a no-go. 回答1: This is how I did it before I removed it from my app: #import <CommonCrypto/CommonDigest.h> NSString* md5( NSString *str ) { const char *cStr = [str UTF8String]; unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5( cStr, strlen(cStr), result ); return [[NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X
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