Encryption and Decryption

Encryption is the process of converting normal data or plaintext to something incomprehensible or cipher-text by applying mathematical transformations. These transformations are known as encryption algorithms and require an encryption key. Decryption is the reverse process of getting back the original data from the cipher-text using a decryption key. The encryption key and the decryption key could be the same as in symmetric or secret key cryptography, or different as in asymmetric or public key cryptography.


A number of encryption algorithms have been developed over time for both symmetric and asymmetric cryptography. The ones supported by the default providers in J2SE v1.4 are: DES, TripleDES, Blowfish, ...

Get J2EE™ Security for Servlets, EJBs and Web Services: Applying Theory and Standards to Practice now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.