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8 Popular Encryption methods real Usage

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Encryption works as it replaces original data with some special characters and stores the data. You need a private key to decrypt the data. Else it is not possible to understand encrypted data even for hackers.

Private keys are two types. Sender uses one private key and receiver uses one other private key.
I have given in this post about 8 encryption methods.

Flow Diagram Encryption
 Different Encryption Methods Classic CipherRandom Key GenerationRSA TokenHash FunctionsMac value - Message Authentication codeKey HashTLS ProtocolAuthenticated Cipher  1. Classic Cipher The best example is this kind of algorithm was used in world war -II communication machines. 2. Random Key Generations One kind of security. They use an algorithm that sends random numbers. People use that number as a password.
3. RSA Token Every 60 seconds a token is generated. Mostly people use for financial applications. An extra identity mechanism along with user id and password. 4. Hash Functions It assigns a hash va…
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Big Data: Hadoop File system checking Utility- fsck

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Hadoop+Big data+Jobs
Hadoop provides file system utility which is called "fsck"

  • Basically, it checks health of all the files under a path
  • It also check health of all the files under the '/'(root)
BIN/HADOOP  fsck  /

- It checks health of all the files

BIN/HADOOP  fsck    /test/

- It checks health of files under the path

How to find which file is healthy:

- It prints out dot for each healthy file

- It will print message for each file, if it is not healthy, also for under replicated blocks, over replicated blocks, mis-replicated blocks, and corrupted blocks.

By default fsck utility cannot do anything for under replicated blocks and over replicated blocks. Hadoop itself heal the blocks.

How to delete corrupted blocks:

BIN/HADOOP  fsck   -delete  block-names

It will delete all corrupted blocks

BIN/HADOOP  fsck   -move  block-names

It will move corrupted blocks to /lost directory

Other options we can use with fsck:
  • -files
  • -blocks
  • -locations
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