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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
500 Series: Syntax error, command unrecognized and the requested action did not take place. This may include errors such as command line too long. 501:
While Dropbox uses SSL to encrypt data in transit between itself and customers and stores data in encrypted form, it does not use end-to-end encryption in which the user controls the keys used to encrypt the stored data. As a result, Dropbox can decrypt customers' data if it chooses to. [163]
The term "end-to-end encryption" originally only meant that the communication is never decrypted during its transport from the sender to the receiver. [9] For example, around 2003, E2EE has been proposed as an additional layer of encryption for GSM [10] or TETRA, [11] in addition to the existing radio encryption protecting the communication between the mobile device and the network infrastructure.
The Advanced Encryption Standard (AES), also known by its original name Rijndael (Dutch pronunciation: [ˈrɛindaːl]), [5] is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001.
ECB Encryption Steps for CTS. E n−1 = Encrypt (K, P n−1). Encrypt P n−1 to create E n−1. This is equivalent to the behavior of standard ECB mode. C n = Head (E n−1, M). Select the first M bits of E n−1 to create C n. The final ciphertext block, C n, is composed of the leading M bits of the second-to-last ciphertext block. In all ...
For CFB-8, an all-zero IV and an all-zero plaintext, causes 1/256 of keys to generate no encryption, plaintext is returned as ciphertext. [10] For OFB-8, using all zero initialization vector will generate no encryption for 1/256 of keys. [11] OFB-8 encryption returns the plaintext unencrypted for affected keys.
The IPsec stack, in turn, intercepts the relevant IP packets if and where appropriate and performs encryption/decryption as required. Implementations vary on how the interception of the packets is done—for example, some use virtual devices, others take a slice out of the firewall, etc. IKEv1 consists of two phases: phase 1 and phase 2. [10]