Final Project for Operating Stystems 1 (CS_344_400_F2017)

Five programs that encrypt and decrypt information using a one-time pad-like system

This program creates a key of specified length. The characters generated will be any of the 27 allowed characters, generated using the standard UNIX randomization methods.

Client application that connects to otp_enc_d, and asks it to perform a one-time pad style encryption.

This program is to be ran in the background as a daemon. Its function is to perform actual encoding. This program will listen on a particular socket/port. When a connection is made, it will spawn a child process to handle the client requet. The child receives a plaintext and key via communication socket, and will write back the ciphertext.

Client application that connects to otp_dec_d, and asks it to perform a one-time pad style decryption.

This program is to be ran in the background as a daemon. Its function is to perform actual decoding. This program will listen on a particular socket/port. When a connection is made, it will spawn a child process to handle the client requet. The child receives an encrypted text and key via communication socket, and will write back the decyphered text.

$ otp_enc_d 50011 &	
$ otp_dec_d 50012 &	
$ keygen 50 > mykey	
$ cat plaintext1
$ THE RED GOOSE FLIES AT MIDNIGHT STOP
$ otp_enc plaintext1 mykey 50011 > ciphertext1
$ cat ciphertext1	
$ FJLKAESJOL IOVJSANFL PAOIEFJA DYGFYB	
$ otp_dec ciphertext1 mykey 50012 > plaintext1_a	
$ cat plaintext1_a	
$ THE RED GOOSE FLIES AT MIDNIGHT STOP