Question

Using OpenSSL from the command line interface. Please solve all the following questions. I also need the screenshots for every part.

a. Create a text file with some input and encrypt it using

i. AES-128 CBC

ii. AES-256 CTR

iii. DES

b. Create a 2048 bit RSA public and private key

Answer 1

OpenSSL is cryptography toolkit which can be used for encryption and decryption of files and messages.

Now let's move to the question:-

A)Assume that you have created a file named "ashok.txt" with some personal input and you want to encrypt it.

i) Encrytion with  AES-128 CBC:-

Open the command line interface of your pc which may have windows or linux and type there:-

Note: You can download OpenSSL from their official website and install in your system incase there is no OpenSSL but most of the linux distro have already pre-installed OpenSSL.

i) openssl enc -aes-128-cbc -salt -in ashok.txt -out ashok.txt.enc

ii) Encrytion with AES-256 CTR:

openssl enc -aes-256-ctr -salt -in ashok.txt -out ashok.txt.enc

iii)DES:-

Decryption of both AES-128 CBC and AES-256 CTR:- Same file will be decrypted:

AES-128 CBC DES:-

openssl enc -aes-128-cbc -d -in ashok.txt.enc -out ashok.txt

AES-256 CTR DES:-

openssl enc -aes-256-ctr -d -in ashok.txt.enc -out ashok.txt

syntax Explanation:-

openssl= cmd line tool

enc= encryption with ciphercodes

aes-256-ctr and aes-128-cbc= Encryption methods

salt= makes more powerful encryption

in= input data or file

ashok.txt= original file(without encrypted)

ashok.txt.enc= Encrypted file

out= output file

d= Decrypts data

B)Create a 2048 bit RSA public and private key:-

2048 bit RSA public key generation:-

command:- openssl genrsa -des3 -out public.pem 2048

2048 bit RSA private key generation:-

command:- openssl genrsa -des3 -out private.pem 2048

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