Encoding decoding using XOR gate

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hi i need to create method for personal encoding like this

for example i have string parameter A = "P@ssw0rd" and B = 0xffa1
C = A XOR B
C is my result
it's clear
but in decoding
what operator i have to use to get A from C and B????
A = C (what operator) B ??????

What I have tried:

string A = "P@ssw0rd";
string B = 0xffa1;
C = A XOR B

Posted 2-Oct-17 3:03am

Roozbeh Amiressami

Updated 2-Oct-17 7:10am

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OriginalGriff · Answer 1 · 2017-10-02T03:08:00

Solution 1

The same one!

A XOR B == C
C XOR B == A

But TBH XOR is not an good encryption algorithm, it's far, far too easy to break - and you shouldn't be encrypting passwords anyway! You should Hash your passwords, not encrypt them: Password Storage: How to do it.[^]

Posted 2-Oct-17 3:08am

OriginalGriff

CPallini · Answer 2 · 2017-10-02T03:11:00

Solution 2

Bitwise the XOR operation is reversible:

(a xor b) xor b = a

hence, if probably done, you can reverse the XOR 'ecryption' simply XORing again with the same key.

Posted 2-Oct-17 3:11am

CPallini

Comments

Roozbeh Amiressami 2-Oct-17 9:20am

thank you so much
i know but its a college project

Patrice T · Answer 3 · 2017-10-02T07:10:00

Solution 3

Quote:
but in decoding
what operator i have to use to get A from C and B????

Same
A second xor cancel the first one.
So when you have C=A xor B, you will also have A=C xor B and B=A xor C with same values for A,B,C.

Posted 2-Oct-17 7:10am

Patrice T