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Category Archives: Project 2: Multiple Data Compression and Encryption

In computer science and information theory, data compression, source coding, or bit-rate reduction involves encoding information using fewer bits than the original representation. Compression can be either be lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by identifying marginally important information and removing it. The process of reducing the size of a data file is popularly referred to as data compression, although its formal name is source coding (coding done at the source of the data, before it is stored or transmitted).

Multiple Data Compression & Encryption Using Iterartive Technique(2,3,4,5,6 & 7 bit compression & decompression) make & RCS

RCS file: codelength.c,v Working file: codelength.c head: 1.4 branch: locks: strict root: 1.4 access list: symbolic names: keyword substitution: kv total revisions: 4;    selected revisions: 4 description: this func finds the code length —————————- revision 1.4    locked by: root; date: … Continue reading

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Multiple Data Compression Technique

Multiple Data Compression is an iterative technique to compress the text data. RCS file: ./header.h,v Working file: ./header.h head: 1.4 branch: locks: strict root: 1.4 access list: symbolic names: keyword substitution: kv total revisions: 4; selected revisions: 4 description: This … Continue reading

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Using dd command to Convert a file

dd—Convert a file while copying it (data dumper) Syntax: dd [—help] [—version] [if=file] [of=file] [ibs=bytes] [obs=bytes] [bs=bytes] [cbs=bytes] [skip=blocks] [seek=blocks] [count=blocks] [conv={ascii, ebcdic, ibm, block, unblock, lcase, ucase, swab, noerror, notrunc, sync}] DESCRIPTION: The GNU version of dd copies a file … Continue reading

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Multiple Data Compressions And Encription Using Iterative Technique

Logfile of compleated Project ————————————————— ————————————————— RCS file: header.h,v Working file: header.h head: 1.1 branch: locks: strict root: 1.1 access list: symbolic names: keyword substitution: kv total revisions: 1;    selected revisions: 1 description: It includes basic headers which are used … Continue reading

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what is 256-Bit Encryption

256-Bit Encryption is a data/file encryption technique that use a 256-bit key to encrypt and decrypt data or files.it is one of the most secure encryption method after 128 and 192-bit encryption,and is used in most modern encryption algorithms ,protocols … Continue reading

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master_array creation

RCS file: fun.c,v Working file: fun.c head: 1.1 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 1; selected revisions: 1 description: rcs initiallised —————————- revision 1.1 date: 2015/07/26 06:38:44; author: saroj; state: Exp; Initial revision ============================================================================= … Continue reading

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mylog_28_1(Encryption coding successfully done)

RCS file: header.h,v Working file: header.h head: 1.1 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 1; selected revisions: 1 description: It contains the header file which have to be included in the source code before … Continue reading

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Updated RCS Log File

RCS file: mdc.c,v Working file: mdc.c head: 1.6 branch: locks: strict ravi: 1.6 access list: symbolic names: keyword substitution: kv total revisions: 6; selected revisions: 6 description: Unique Master Array is being created using functions and pointers countred the codelength … Continue reading

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Mdc project prototypes created for various compression file

RCS file: header.h,v Working file: header.h head: 1.5 branch: locks: strict emblogic: 1.5 access list: symbolic names: keyword substitution: kv total revisions: 5; selected revisions: 5 description: Header file and prototype for mdc project. —————————- revision 1.5 locked by: emblogic; … Continue reading

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My log

RCS file: header.h,v Working file: header.h head: 1.1 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 1; selected revisions: 1 description: It contains the various headers files and different function calls which are used in the … Continue reading

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RCS Log File

RCS file: mdc.c,v Working file: mdc.c head: 1.5 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 5; selected revisions: 5 description: Unique Master Array is being created using functions and pointers countred the codelength of the … Continue reading

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MDC project

Working file: comperession.c head: 1.1 branch: locks: strict emblogic-19: 1.1 access list: symbolic names: keyword substitution: kv total revisions: 1;     selected revisions: 1 description: compress the master array —————————- revision 1.1    locked by: emblogic-19; date: 2002/01/01 03:35:03;  author: emblogic-19;  state: … Continue reading

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MDC Project

Learnt to use GDB debugger and source code control commands – RCS. Also we got to know that how to include an externally defined function into the main file

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2 bit mdc successfully done.

RCS file: header.h,v Working file: header.h head: branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 0 description: This is header file define prototype for compress decompress and master_array function include stdio.h stdlib.h fcntl.h string.h ============================================================================= RCS … Continue reading

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Successfuly performed 3 bit compression

RCS file: 3bit.c,v Working file: 3bit.c head: 1.2 branch: locks: strict access list: symbolic names: keyword substitution: kv total revisions: 2; selected revisions: 2 description: THIS IS THE BASE FILE FOR 3 BIT COMPRESSION….. —————————- revision 1.2 date: 2015/02/22 17:59:52; … Continue reading

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