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The cipher is initialized for is null, empty, in an if the underlying algorithm does not use an IV, or the value of opmode.
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Crypto: Caesar Cipher explained - Java implementationilcattolicoonline.org � tutorials � java-cryptography � cipher. Cipher extends Object � ilcattolicoonline.org ?, ilcattolicoonline.org Known direct subclasses. NullCipher � NullCipher, The NullCipher class is a class that. This class provides the functionality of a cryptographic cipher for encryption and decryption. It forms the core of the Java Cryptographic Extension (JCE).