Let us C Solutions | C Programming | Encryption Decryption by offset chipher and substitution in C
Let us C Chapter 19 File Input Output Exercise C g: Attempt the following: Write a program to encrypt/decrypt a file using:
1. An offset cipher: In an offset cipher each character from the source file is offset with a fixed value and then written to the target file. For example, if character read from the source file is 'A', then convert this into a new character by offsetting 'A' by a fixed value, say 128, and then writing the new character to the target file.
2. A substitution cipher: In this each character read from the source file is substituted by a corresponding predetermined character and this character is written to the target file. For example, if character 'A' is read from the source file, and if we have decided that every 'A' is to be substituted by '!', then a '!' would be written to the target file in place of every 'A'. Similarly, every 'B' would be substituted by '5' and so on.
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This video from Learn coding with Techvideopedia (TVP) explains:
0:00 Let us C solution Chapter 19 Exercise C g
0:30 Understanding encryption / decryption with C
2:20 Encryption in C program
4:30 Concept of cryptography in C
5:56 Decryption in C program
6:10 Offset cipher in C
7:10 Read characters entered in C
9:05 Substitution cipher in C
11:20 Encryption decryption in a file in C
12:12 Write data in file in C
16:07 Encrpting file contents using offset cipher in C
19:20 Read encrypted data from file in C
20:34 Decrypt file contents using substitution cipher in C
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