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Encryption is used in the 21st century to protect digital data and information systems. As computing power increased over the years, encryption technology has only become more advanced and secure. However, this advancement in technology has also exposed a potential limitation of today's encryption methods.
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The PPTP specification does not describe encryption or authentication features and relies on the Point-to-Point Protocol being tunneled to implement any and all security functionalities. The PPTP implementation that ships with the Microsoft Windows product families implements various levels of authentication and encryption natively as standard ...
If properly used, one-time pads are secure in this sense even against adversaries with infinite computational power. Shannon proved, using information theoretic considerations, that the one-time pad has a property he termed perfect secrecy ; that is, the ciphertext C gives absolutely no additional information about the plaintext .
Some archive utilities have a separate un-archive utility for the reverse operation. One nearly universal type of archive file format is the zip file. Cryptographic utilities encrypt and decrypt streams and files. Data compression utilities output a shorter stream or a smaller file when provided with a stream or file.
Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that the decrypted information appears as a visual image. One of the best-known techniques has been credited to Moni Naor and Adi Shamir , who developed it in 1994. [ 1 ]
If the attacker removes from the user the ability to authenticate however, the SecurID server will assume that it is the user who is actually authenticating and hence will allow the attacker's authentication through. Under this attack model, the system security can be improved using encryption/authentication mechanisms such as SSL.
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