cryptography « bit « Java Data Type Q&A

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1. 128 bit data encryption using Java    stackoverflow.com

I need to store some sensitive data by encrypting it with atleast 128 bit key. I investigated into javax.crypto package and found that there are certain Cipher names, like PBEWithMD5AndDES or ...

2. Cracking a N bit RSA modulo numbers    stackoverflow.com

This is related to my previous post, where my only option was to have a RSA algorithm which seemed relatively weak. Let us assume that I want to encode a ...

3. Generating 128-bit keys with keytool    stackoverflow.com

Is there a way to generate a 128-bit key pair suitable for encryption using Sun's keytool program? It seems that the algorithms available in http://java.sun.com/javase/6/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator are either not ...

4. Java 256bit AES Encryption    stackoverflow.com

I need to implement 256 bit AES encryption, but all the examples I have found online use a "KeyGenerator" to generate a 256 bit key, but I would like to use ...

5. What type of encryption to use for 48-bit to 48-bit?    stackoverflow.com

I've got a bunch of 48-bit (6 byte) values that I need to encrypt symmetrically. The two requirements are:

  1. The resulting encrypted value needs to also be 48-bits (6 bytes) long. They ...

6. 256bit AES/CBC/PKCS5Padding with Bouncy Castle    stackoverflow.com

I am having trouble mapping the following JDK JCE encryption code to Bouncy Castles Light-weight API: 

public String dec(String password, String salt, String encString) throws Throwable {
    // AES ...

7. Need library for the 3-DES cipher that supports 1-bit feedback cipher modes    stackoverflow.com

I couldn't find a java library that supports the CFB, OFB or CBC mode in the 1-bit stream mode. So far, the libraries I've tried (BouncyCastle and IAIK) only support ranges 8-64. ...

8. java.security.InvalidKeyException: Key length not 128/192/256 bits    stackoverflow.com

I am new to Java and was trying to use Hybrid cryptography using AES-128 Symmetric encryption and then RSA-1024 Asymmetric encryption on the generated symmetric key. Can someone help why I ...

9. How to de/encrypt with Rijndael (AES) and a Blocksize of 256 bits?    stackoverflow.com

For certain reasons i need to implement rijndael de/compression with a blocksize of 256 bits (reason: data is encrypted in php and php can do it...). How can i change the Blocksize ...