Javax.crypto.BadPaddingException: Given final block not properly padded

There are many problems when you try encrypting a string such password, credit card nos, phone no. Here is the question to all your answers. Many people face problem while decrypting the encrypted data as the KEY used for encryption javax.crypto.BadPaddingException: Given final block not properly padded stored as String in database then it becomes very tough to use that string as the KEY.

So below is the code where you only need to store the encrypted code and not the  key. The decryption will take place as an when wanted. For encryption we must use a secret key along with an algorithm. AES algorithm with a given key. Below is the code how you can use the above encryption algorithm. Change forbidden and Discouraged Reference and change it to warning. Solution: Removing JRE system Library then adding it back from Build Path settings in the project properties.

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The above code is still really basic its not the best we can do with AES. I never said its the best Code using AES. Nice post farhan, spring security also provides way to encrypt password outofbox using MD5 and other encryption algorithm. Though this can be used a nice utility.

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I made this program in ECLIPSE IDE. Small improvement to the code is to change the usage of sun. 64 even in Java 6, because it’s not part of the API of java. Unknown Thank you for the information.

Well I don’t have any experience on Steganography. But yeah there are blog posts available. This comment has been removed by a blog administrator. Thanks, that was exactly wath I was looking for. But since Base64 is now in Java8, it’s better to use Base64.

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It was very useful for me. You have really save me from a very big challenge that gave me sleepless nite. I was just looking for something like this to know my way forward and all i could get from Stackoverflow was the first class AESencrp but how to checkout was another brain dump. I believe you have got this code working.

Anyone know how to fix it? Hey there my encrypted string breaks after 77 characters and rest of the encrypted string goes to 2nd line. I want whole string in a single line. Can you help me in that ? Hey my encrypted string breaks after 77 characters and rest of the encrypted string goes to 2nd line. I want whole encrypted code in single line.

Can you help in that ? Hi, Thank a lot, it is working and very clear about it. Why this program don’t use many characters for its output? How can I use this codes with cloud computing?

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I need to encrypt the text before upload it to cloud. After day having sex with AES, I found working code. Thanx a lot and kudos to you! It gave me a lot of useful information.

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Will this code work in netbeans? After a long interval of time I am writing a post on ALGORITHMS . I will start with the very basic of Algorithms. M9 1a8 8 0 1 0 0 16A8 8 0 0 0 9 1zm. Join Stack Overflow to learn, share knowledge, and build your career. M9 1a8 8 0 1 0 0 16A8 8 0 0 0 9 1zM8 15.

So, if you get this exception, catch it and treat it as “wrong key”. This also can happen when you provide a wrong password, which then is used to get the key from a keystore, or which is converted into a key using a key generation function. Of course, bad padding can also happen if your data is corrupted in transport. It encrypts each block independently, which means that identical plain text blocks also give always identical ciphertext blocks. You normally don’t want only confidentiality, but also authentication, which makes sure the message is not tampered with. This also prevents chosen-ciphertext attacks on your cipher, i. DES has an effective key size of only 56 bits.

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This key space is quite small, it can be brute-forced in some hours by a dedicated attacker. If you generate your key by a password, this will get even faster. Also, DES has a block size of only 64 bits, which adds some more weaknesses in chaining modes. I’m new to encryption and this is my scenario, I’m using AES encryption. I used a wrong encryption key in decrypt and I got this javax. Should I treat this as a wrong key?

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Just to be clear, this can also happen when providing the wrong password for a key store file, such as a . 12 file, which is what just happened to me. Of course, corrupted data is another possibility. I did find your answer useful enough to upvote it, though. You can choose your padding schema when you instantiate the Cipher object.

Supported values depend on the security provider you are using. By the way are you sure you want to use a symmetric encryption mechanism to encrypt passwords? Wouldn’t be a one way hash better? If you really need to be able to decrypt passwords, DES is quite a weak solution, you may be interested in using something stronger like AES if you need to stay with a symmetric algorithm. I am very new to Java and also Cryptography so I still don’t know better ways to do encryption.

I just want to get this one done than probably look for better ways to implement it. Anyway, indeed your issue happens since you decrypt with a key which is not the same as the one used for encryption as explained by Paulo. Before in junit is executed before every test method, thus regenerating the key every time. Not the answer you’re looking for? How to encrypt a file in . Does finally always execute in Java? The food I ate didn’t “agree with me”.

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RSA, PKI infrastructure, key pairs, etc. It must be simple enough to get rid of the people snooping around, and easy to decrypt for other companies interested in getting that data. They call us, we tell them the standard or give them some simple key which can then be used for decryption. Probably those companies could use different technologies so it would be good to stick to some standard which is not tied to some special platform or technology. I’d recommend to use some standard symmetric cypher that is widely available like DES, 3DES or AES. Cipher class for more info, e. Can I suggest you update this example to reference the DESede algorithm?

DES, since the cipher is so weak by today’s standards. This is the first page that shows up via Google and the security vulnerabilities in all the implementations make me cringe so I’m posting this to add information regarding encryption for others as it has been 7 Years from the original post. Also, do note that a lot of implementation might be secure for a given situation, but why use those and potentially accidentally make a mistake? Use the strongest tools you have available unless you have a specific reason not to. Overall I highly advise using a library and staying away from the nitty gritty details if you can.

18: I rewrote some parts to make them simpler to understand and changed the recommended library from Jasypt to Google’s new library Tink, I would recommend completely removing Jasypt from an existing setup. I will outline the basics of secure symmetric cryptography below and point out common mistakes I see online when people implement crypto on their own with the standard Java library. If you want to just skip all the details run over to Google’s new library Tink import that into your project and use AES-GCM mode for all your encryptions and you shall be secure. First thing first you need to pick a symmetric key Block Cipher. Pseudo-Randomness is fake randomness that no computer other than a Quantum Computer would be able to tell the difference between it and real randomness. The Block Cipher is like the building block to cryptography, and when used with different modes or schemes we can create encryptions.

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Now regarding Block Cipher Algorithms available today, Make sure to NEVER, I repeat NEVER use DES, I would even say NEVER use 3DES. Fun fact DES was broken by the NSA back when it was initially founded and actually kept a secret for a few years and although some people still claim 3DES is secure, there are quite a few research papers that have found and analyzed weaknesses in 3DES. Encryption is created when you take a block cipher and use a specific scheme so that the randomness is combined with a key to creating something that is reversible as long as you know the key. This is referred to as an Encryption Mode. There exist other modes outside of the ones listed and researchers are always working toward new modes to improve existing problems. Now let’s move on to implementations and what is secure. NEVER use ECB this is bad at hiding repeating data as shown by the famous Linux penguin.

In response to the issue found with ECB mode nounces also known as IVs were created. The idea is that we generate a new random variable and attach it to every encryption so that when you encrypt two messages that are the same they come out different. The beauty behind this is that an IV or nonce is public knowledge. That means an attacker can have access to this but as long as they don’t have your key, they cant do anything with that knowledge. Common issues I will see is that people will set the IV as a static value as in the same fixed value in their code. IVs the moment you repeat one you actually compromise the entire security of your encryption. Note: SHA1 is broken but I couldn’t find how to implement SHA256 into this use case properly, so if anyone wants to take a crack at this and update it would be awesome!