The Hadoop Distributed File System (HDFS) is a distributed file system that runs on standard or low-end hardware. Developed by Apache Hadoop, HDFS works like a standard distributed file system but provides better data throughput and access through the MapReduce algorithm, high fault tolerance and native support of large data sets.
Symmetric encryption is a form of computerized cryptography using a singular encryption key to guise an electronic message. Its data conversion uses a mathematical algorithm along with a secret key, which results in the inability to make sense out of a message. Symmetric encrpytion is a two-way algorithm because the mathematical algorithm is reversed when decrypting the message along with using the same secret key.
The two types of symmetric encryptions are done using block and stream algorithms. Block algorithms are applied to blocks of electronic data. Specified set lengths of bits are transformed, while simultaneously using the selected secret key. This key is then applied to each block. However, when network stream data is being encrypted, the encryption system holds the data in its memory components waiting for the blocks in their entirety. The time in which the system waits can yield a definite security gap, and may compromise data protection. The solution involves a process where the block of data could be lessened and combined with previous encrypted data block contents until the rest of the blocks arrive. This is known as feedback. When the entire block is received, then it is encrypted. Conversely, stream algorithms are not held in the encryption system memory, but arrive in data stream algorithms. This type of algorithm is considered somewhat more secure, since a disk or system is not holding on to the data without encryption in the memory components.
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