Encryption

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Come up with an encryption/decryption mechanism. The program runs with one of the following sets of arguments: -e fileName fileOutputName -d fileName fileOutputName where: fileName is the name of a file to be encrypted/decrypted. fileOutputName is the name of the file where you need to write the re

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matemate123

Level 37 , Kraków, Poland

25 January, 14:31

It's good that I remembered lesson from Java Syntax zero. You can look, on Java Syntax Zero Level 9, Lesson 6 Bitwise operations, part 2 -> 4.Encryption Rest is like always on this chapter ;)

Олег Байбула

Level 32 , Ukraine

Expert

20 February, 13:52

Thank you, could not get it because, I'd skipped Bitwise lessons. 😁

Justin Smith

Level 39 , Greenfield, USA, United States

7 October 2021, 14:05

If you got to this task and panicked like I did "OMG they didn't teach us anything about encryption yet" relax It's not real encryption. It would help if they said "Don't use any of Java's encryption classes. Just convert each byte to another byte, and be able to do this process in reverse."

Jurij Thmsn

Level 29 , Flensburg, Germany

13 April 2021, 15:50

Make sure you take "-e" and "-d" as arguments, not "e" and "d" !

Bartlomiej Drozd

Level 22

22 February 2021, 21:24

470

Isma

Level 41 , Madrid, Spain

30 December 2020, 09:28

To those who got confused by "encryption/decryption mechanism". You can create your own mechanism:

byte = byte + 1

is an encryption mechanism. The analogous decryption mechanism would be

byte = byte - 1

Nyerges Ferenc

Level 23 , Bükkábrány, Hungary

8 November 2020, 13:35

Cool task :-) Passed for 2nd ( I should have remembered the difference between i++ and ++i :-) )

Seferi

Level 22 , United Federation of Planets

18 October 2020, 19:36

This task was a lot of fun!

Agent Smith

Level 38

5 September 2020, 18:08

Wow, only 364 people managed to do this task by September 2020. Lowest I've seen so far! I'll leave a small hint: Caesar cipher It might look complicated to do at first, but in fact it is much easier to apply with files than with letters.

Sela

Level 20 , Poland

18 September 2020, 10:24

no of completions: 376 by now

Andrei

Level 41

28 January 2021, 08:55

455 today.

Petros

Level 23 , Columbia, United States

22 August 2020, 21:51

All I found on the internet was Cipher encryption/decryption and that's apparently not on the Codegym system so it can't be used. I had to use the Help section for this one. Brutal. I'm taking intro to computer science this semester at my Uni so maybe they'll brush up on this.

BlueJavaBanana

Level 37

25 May 2020, 11:30

Important Note: For this task the args are as follows: args[0] = -e or -d args[1] = fileIn args[2] = fileOut It is not all in one string that you need to split as I thought.