md5 | 易学教程

How do you test if 2 large videos are identical?

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问题 I have a system where video files are ingested and then multiple CPU intensive tasks are started. As these tasks are computationally expensive I would like to skip processing a file if it has already been processed. Videos come from various sources so file names etc are not viable options. If I was using pictures I would compare the MD5 hash but on a 5GB - 40GB video this can take a long time to compute. To compare the 2 videos I am testing this method: check relevant metadata matches check

using TripleDes and MD5 in swift

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问题 I have an algorithm in java code for using tripleDes and MD5. there is my java code : private String _encrypt(String message, String secretKey) throws Exception { MessageDigest md = MessageDigest.getInstance("MD5"); byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8")); byte[] keyBytes = Arrays.copyOf(digestOfPassword, 16); SecretKey key = new SecretKeySpec(keyBytes, "DESede/ECB/PKCS7Padding"); Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS7Padding"); cipher.init(Cipher

Calculate md5 hash of a zip file in Java program

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问题 I have a zip file, and in my Java code i want to calculate the md5 hash of the zip file. Is there any java libary i can use for this purpose ?. Some example would be really appreciated. Thank You 回答1: I got that working a few weeks ago with this Article here: http://www.javalobby.org/java/forums/t84420.html Just to have it a stackoveflow: public static void main(String[] args) throws NoSuchAlgorithmException, FileNotFoundException { MessageDigest digest = MessageDigest.getInstance("MD5");

How to easily apply Crypto++ hash functions?

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Can someone help me how can I easily use hash functions from Crypto++ library? I tried used these codes for SHA1 and MD5. I have many errors on line where is StringSink . The errors are like: undefined reference to `CryptoPP::StringSinkTemplate::StringSinkTemplate(std::string&)' Thanks for help. // SHA CryptoPP::SHA1 sha1; std::string source = "Hello"; std::string hash = ""; CryptoPP::StringSource(source, true, new CryptoPP::HashFilter(sha1, new CryptoPP::HexEncoder(new CryptoPP::StringSink(hash)))); std::cout << hash; // MD5 CryptoPP::MD5 hash; byte digest[ CryptoPP::MD5::DIGESTSIZE ]; std:

CRC32 and MD5 algorithms for dummies

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问题 I'd like to implement the CRC32 and MD5 algorithms on my own but I'm still trying to wrap my head around the different sources I've found on the subject. Could someone helpful point me to a ressource that explains the algorithms in a simple format or post a bullet list of the different steps so I can attempt to fill them in. TIA. Here's the respective wikipedia pages on each. I understand part of what's being done but bitwise operations are something I have difficulty with. That and

Password Recovery: How to decrypt an md5 encrypted password? [duplicate]

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This question already has answers here : Closed 6 years ago . Possible Duplicate: Is it possible to decrypt md5 hashes? In my website, I'm using md5 encryption for the password. So it's saving in the encrypted form in the database. For doing the password recovery, how can I decrypt the encrypted password ?? Please Help :) As others described quite well, you cannot easily 'decrypt' an MD5 hash. I guess the best way to do your password recovery is like this: A user can request password recovery by providing his email address (it should be unique so users can be identified by email address). an

how to make a MD5 batch virus scanner? [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . So I have done my research on md5 and found this which PieSub quoted MD5 generation code; @echo off for /r %%f in (*) do md5.exe %%f >> output.txt which when I try to generate md5 code for the files in a certain directory this batch (md5.bat) was placed in the result looks like

How to convert md5 string to normal text? [duplicate]

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问题 This question already has answers here : Is it possible to decrypt MD5 hashes? (24 answers) Closed 2 years ago . I have saved user passwords in MD5 form in my database, now I want to send password to users in plaintext, is there any way I can convert an MD5 string to plaintext? 回答1: Md5 is a hashing algorithm. There is no way to retrieve the original input from the hashed result. If you want to add a "forgotten password?" feature, you could send your user an email with a temporary link to

How can I make MD5 more secure? Or is it really necessary?

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I'm storing username and password in a MySQL database and have them hashed using MD5. However, I'm only using the standard PHP function without any modification. Now, I read that MD5 is broken. How are you doing it? Do you run it several times through a different hash mechanism or add some form of salt? I'm amazed how people jump on the bandwagon of "damn, it's broken, I won't use it!", don't do the same mistake. You can't make the MD5 better. Even using SHA-1 is vulnerable to same type of attacks as MD5. Using bcrypt will use A LOT more CPU than MD5 and SHA algorithms. MD5 is designed to be

Blackberry encode MD5 different from MD5 in C#

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问题 I have my passwords encoded in MD5 in C# and inserted in my DB. MD5 MD5Hasher = MD5.Create(); byte[] PasswordHash = MD5Hasher.ComputeHash(Encoding.Unicode.GetBytes(PasswordText.Value)); PasswordHash is inserted as is and look like 0x09C09E5B52580E477514FA.......... for example. In the blackberry app, I get the password, want to encode it to pass it to a web service that will compare both hashed password. The problem is my result is different from the MD5 I create in my Blackberry app.