> # Compatibility changes

> ## Incompatible changes between Cryptix V2.2 and V3.0

> This documentation is not completed - it should go into more detail about each of the following:

> - cryptix.pgp.CFB renamed to cryptix.security.CFB_PGP.
> - Use of IVs in cryptix.security.CFB changed.
> - cryptix.security.CFB(BlockCipher) constructor removed.
> - protected field KeyRing.entrysById renamed to entriesById.

> ## Java 1.0.x and Java 1.1.x compatibility

> This version of the Cryptix library will compile only under Java 1.1, although almost all features will work correctly when the code is run in a Java 1.0 VM. However, please note that there are a few exceptions:

> ### CompressedData

> The new `CompressedData` class (`cryptix.pgp.CompressedData`) relies on the new Java 1.1 compression classes in order to carry out the job of compression and decompression. Unfortunately, these classes are unavailable under Java 1.0.

> This means that Java 1.0 users will still not be able to deal with PGP's compressed data (and in fact, will never be able to deal with compression).

> If you are a Java 1.0 user, then, regrettably, you will not be able either to compress or to decompress anything. (One good reason for upgrading as soon as you can, perhaps?)

> ### ElGamal and RSA algorithms for JCE

> The packages `cryptix.security.elgamal` and `cryptix.security.rsa` contain some code that relies on the class `java.math.BigInteger`. This is only available in Java 1.1, so if you try to use ElGamal or the JCE version of RSA from Java 1.0, a `NoClassDefFoundError` will be thrown.

> `cryptix.security.rsa` actually includes two separate RSA implementations, one of which uses `cryptix.math.BigInteger`, and will work under Java 1.0. However, this older implementation is deprecated.

> ### SecureRandom class

> The `java.security.SecureRandom` class is not supported under Java 1.0. Any code that uses it, directly or indirectly, will throw a `NoClassDefFoundError`. This includes JCE KeyGenerators and KeyPairGenerators (it is still possible to create Key objects in Java 1.0 by using `cryptix.security.keys.RawSecretKey`).

Copyright © 1997 Systemics Ltd
on behalf of the Cryptix Development Team.
All rights reserved.
Cryptix is a trademark of Systemics Ltd.