39556963
compression,
encryption + hashing
- COMPRESSION
- lossy
- reduces the file size by permanently
removing some of its information.
- image, video + audio files
- decrease in quality, inability to return to the original format
- image, video + audio files
- reduces the file size by permanently
removing some of its information.
- lossless
- compressed files by recording patterns in data
instead of the actual data the original file can be
recovered from the compressed version.
- text files, source code,
bank statements
- doesn't reduce file size as much as lossy does
- text files, source code,
bank statements
- dictionary encoding
- frequently occurring pieces of data are replaced by
smaller groups of indexes when being transferred.
- A dictionary is then used to say
which indexes match which
groups of characters.
- When decompressed the
dictionary is used to replace the
tokens with the original text
- When decompressed the
dictionary is used to replace the
tokens with the original text
- A dictionary is then used to say
which indexes match which
groups of characters.
- frequently occurring pieces of data are replaced by
smaller groups of indexes when being transferred.
- RLE
- repeated values are removed and
replaced with one occurrence of
the data followed by the number
of times it should be repeated.
- repeated values are removed and
replaced with one occurrence of
the data followed by the number
of times it should be repeated.
- compressed files by recording patterns in data
instead of the actual data the original file can be
recovered from the compressed version.
- lossy
- ENCRYPTION
- process of converting
plaintext into cipher text
- process of converting
plaintext into cipher text
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