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  • Generate reasonable length license key with asymmetric encryption?

    - by starkos
    I've been looking at this all day. I probably should have walked away from it hours ago; I might be missing something obvious at this point. Short version: Is there a way to generate and boil down an asymmetrically encrypted hash to a reasonable number of unambiguous, human readable characters? Long version: I want to generate license keys for my software. I would like these keys to be of a reasonable length (25-36 characters) and easily read and entered by a human (so avoid ambiguous characters like the number 0 and the capital letter O). Finally--and this seems to be the kicker--I'd really like to use asymmetric encryption to make it more difficult to generate new keys. I've got the general approach: concatenate my information (user name, product version, a salt) into a string and generate a SHA1() hash from that, then encrypt the hash with my private key. On the client, build the SHA1() hash from the same information, then decrypt the license with the public key and see if I've got a match. Since this is a Mac app, I looked at AquaticPrime, but that generates a relatively large license file rather than a string. I can work with that if I must, but as a user I really like the convenience of a license key that I can read and print. I also looked at CocoaFob which does generate a key, but it is so long that I'd want to deliver it as a file anyway. I fooled around with OpenSSL for a while but couldn't come up with anything of a reasonable length. So...am I missing something obvious here? Is there a way to generate and boil down an asymmetrically encrypted hash to a reasonable number of unambiguous, human readable characters? I'm open to buying a solution. But I work on a number of different of platforms, so I'd want something portable. Everything I've looked at so far has been platform specific. Many, many thanks for a solution! PS - Yes, I know it will still be cracked. I'm trying to come up with something reasonable that, as a user, I would still find friendly.

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  • Javascript to encode cookie contents into a get or post?

    - by beeky
    I want to pass cookie contents from one domain to another. I don't want to get involved with actual cross-domain cookies. I was thinking of reading the cookie on the domain that sets it and then sending it as an encrypted JSON object to the domain that wants to use it. Is there an accepted way of doing this and/or a toolkit that handles this sort of thing? Thanks for any help or advice, -=b

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  • C# Encryption Functions

    - by KHALID
    i have table in my database that have senestive data such as password field i want to encrypt data before inserting it to table and then i want not to decrypt data but i want only to compare encrypted password with the input password without decrypting

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  • AES code throwing NoSuchPaddingException: Padding NoPaddin unknown

    - by Tom Brito
    The following code is a try to encrypt data using AES with asymmetric key: import java.io.OutputStream; import java.math.BigInteger; import java.security.Key; import java.security.KeyFactory; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.RSAPrivateKeySpec; import java.security.spec.RSAPublicKeySpec; import javax.crypto.Cipher; public class AsyncronousKeyTest { private final Cipher cipher; private final KeyFactory keyFactory; private final RSAPrivateKey privKey; private AsyncronousKeyTest() throws Exception { cipher = Cipher.getInstance("AES/CBC/NoPaddin", "BC"); keyFactory = KeyFactory.getInstance("AES", "BC"); // create the keys // TODO should this numbers be random? RSAPrivateKeySpec privKeySpec = new RSAPrivateKeySpec(new BigInteger( "d46f473a2d746537de2056ae3092c451", 16), new BigInteger("57791d5430d593164082036ad8b29fb1", 16)); privKey = (RSAPrivateKey) keyFactory.generatePrivate(privKeySpec); } public void generateAuthorizationAct(OutputStream outputStream) throws Exception { // TODO Ticket #14 - GenerateAuthorization action KeyFactory keyFactory = KeyFactory.getInstance("AES", "BC"); // TODO should this numbers be random? RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger("d46f473a2d746537de2056ae3092c451", 16), new BigInteger("11", 16)); RSAPublicKey pubKey = (RSAPublicKey) keyFactory.generatePublic(pubKeySpec); byte[] data = new byte[] {0x01}; byte[] encrypted = encryptAO(pubKey, data); outputStream.write(encrypted); } /** Encrypt the AuthorizationObject. */ public byte[] encryptAO(Key pubKey, byte[] data) throws Exception { cipher.init(Cipher.ENCRYPT_MODE, pubKey); byte[] cipherText = cipher.doFinal(data); return cipherText; } public byte[] decrypt(byte[] cipherText) throws Exception { cipher.init(Cipher.DECRYPT_MODE, privKey); byte[] decyptedData = cipher.doFinal(cipherText); return decyptedData; } public static void main(String[] args) throws Exception { System.out.println("start"); AsyncronousKeyTest auth = new AsyncronousKeyTest(); auth.generateAuthorizationAct(System.out); System.out.println("done"); } } but at line cipher = Cipher.getInstance(AesEncrypter.getTransformation(), "BC"); it throws NoSuchPaddingException: Padding NoPaddin unknown. What is this? And how to solve?

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  • Java Encryption issue

    - by r1k0
    I am using PBE encryption to encrypt and decrypt some text on an Android application but I get the BadPaddingException: with the "pad block corrupted" message when I use the wrong private key to decrypt the text. My question, since I am not well versed with encryption in Java, is if this is the normal behavior of the encryption API, because I need to do some logic in the case when the wrong key is entered, but I do not know the private key, nor do I store it anywhere (storing just the encrypted and decrypted check text). Thanks, Mihai

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  • Cracking WEP wireless networks [closed]

    - by John
    I have a problem.I am new to linux and would like to know how to crack a WEP and WAP wireless encrypted network.I have been typing the command "airmon-ng" i have even initialized the wlan0 with the following command on Backtrack 4 but it has failed,When I use airmon-ng command, it does not display my wireless driver.SomeOne please xplain to me from scratch.Would really appreciate it.

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  • Protect Windows folder without encrypting the contents

    - by Jad
    Hi, I want to protect the "www" folder in my Apache server. Checked some tools on the net like TrueCrypt, FolderEncrypt etc. All these encrypt the folder contents. If the www folder is encrypted, then my php won't work. Is there a way to lock the folder in windows without encrypting its contents.[ A little harder to crack then no lock at all] Regards Jad

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  • use bouncy castle to create public key on j2me

    - by mike
    I got the public key from the certificate, keypair is a java.security.KeyPair object String public_key = keypair.getPublic().toString(); I want to send this to the via an http connection to a J2me application. I cannot find any documentation to convert the transmitted string to a Public key that can be used to encrypt Strings. I also want the J2me to verify signed strings from the server. I want to then send the encrypted strings back to the server.

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  • Simple way to encode a string according to a password?

    - by RexE
    Does Python have a built-in, simple way of encoding/decoding strings using a password? Something like this: >>> encode('John Doe', password = 'mypass') 'sjkl28cn2sx0' >>> decode('sjkl28cn2sx0', password = 'mypass') 'John Doe' I would like to use these encrypted strings as URL parameters. My goal is obfuscation, not strong security. I realize I could use a database table to store keys and values, but am trying to be minimalist.

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  • DPAPI + Entropy

    - by TWith2Sugars
    We have a WPF app that allows our users to download encrypted content and we want to provide the ability to decrypt this content off-line. The idea is to download the keys and store them using the DPAPI but I'm having trouble with the entropy parameter. Is there any way to generate an entropy to consistently use for the DPAPI functions with out hardcoding/storing them? Thanks Tony

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  • mysql query for getting all messages that belong to user's contacts

    - by aharon
    So I have a database that is setup sort of like this (simplified, and in terms of the tables, all are InnoDBs): Users: contains based user authentication information (uid, username, encrypted password, et cetera) Contacts: contains two rows per relationship that exists between users as (uid1, uid2), (uid2, uid1) to allow for a good 1:1 relationship (must be mutual) between users Messages: has messages that consist of a blob, owner-id, message-id (auto_increment) So my question is, what's the best MySQL query to get all messages that belong to all the contacts of a specific user? Is there an efficient way to do this?

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  • WebSockets authentication

    - by Tomi
    What are the possible ways to authenticate user when websocket connection is used? Example scenario: Web based multi-user chat application through encrypted websocket connection. How can I ensure (or guarantee) that each connection in this application belongs to certain authenticated user and "can't be" exploited by false user impersonation during the connection.

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  • How to safely store encryption key in a .NET assembly

    - by Alex
    In order to prevent somebody from grabbing my data easily, I cache data from my service as encrypted files (copy protection, basically). However, in order to do this, I must store the encryption key within the .NET assembly so it is able to encrypt and decrypt these files. Being aware of tools like Red Gate's .NET Reflector which can pull my key right out, I get a feeling that this is not a very safe way of doing it... are there any best practices to doing this?

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  • Java encryption : with method can get me a shorter message ?

    - by Frank
    I don't know too much about encryption, I just want to ask, which method can get me the shortest result message ? For instance, the message looks like this : "This is the secret input message", I wonder if the encrypted message can be shorter then the above 32 characters long ? Maybe something like "dfkfjkvf12". Frank

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  • HTML/JavaScript compation for security.

    - by BCS
    I just ran across this point that references a security vulnerability in Web Apps that depends on looking at the size of encrypted web pages to deduce what the uses is doing. The simplest solution to this I can think of would be to use a tool to minify all static content so that (after encryption) only a small number of result sizes exist so as to minimize the information available to an eavesdropper. Are there any tools for doing this?

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  • java database backup restore

    - by jawath
    how do i backup /restore any kind of databases inside my java application to flate files.Are there any tools framework available to backup database to flat file like CSV, XML,or secure encrypted file,or restore from csv or xml files to databases ,it should be also capable of dumping table vise restore and backup also

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