![]() That's it, we now have our original string back. In order to decrypt our scrambled string all we need is the XOR key (our secret password).įirst we convert each character in the scrambled string into character codes (again with the charCodeAt function) and we XOR the result with our XOR key.Īgain this gives us a number that we convert back into the original character by using the JavaScript fromCharCode function. Now we have a string of characters that is the scrambled result of our string with the XOR key. This gives us a number that we convert back to characters using the JavaScript fromCharCode function. In order to encrypt our string ( b) then we convert all the characters in b to character codes (using the JavaScript charCodeAt function) and XOR them with the XOR key ( a). So what happens here is that a is the XOR key (or the secret password) and b is the string that we want to encrypt. This works on the basic mathematical principle that if If you get a JavaScript error when you click on "Encrypt" then try changing the "XOR Key" to a different number. Use this form for encrypting and decrypting strings using XOR. Xor Encrypt Decrypt Php code#When you encrypt a sequence of numbers (or text or any pattern of bits) with XOR, you have a very basic cipher algorithm.This code is the basic code that is used in the protect email address from spam tool. Encrypt a number (210) with a secret "key" (145).Ģ10 XOR 145 gives you 65 ←- your "scrambled" resultĦ5 XOR 145 gives you 210 ←- and back to your original number If you take that scrambled number and XOR it again with the same secret number, you get your original number back. ![]() If you want to "scramble" a number (a pattern of bits), you XOR it with a "secret" number. XOR acts like a toggle switch where you can flip specific bits on and off. On the simplest level, reversible operations such as XOR (pronounced "exclusive OR") form the foundation of most cryptography. How important cryptography is ? Well it was the cause for the invention of computers. It will give you real insights into the world of cryptography and encrypted bits. īy using a truly random* stream of key the cipher is theoretically unbreakable hence unusableīBC: Code Breakers Bletchley Parks lost Heroes documentary Such a cipher is called a stream cipher in which every next bit is encrypted using a different pseudo-random key, such a kind of encryption was used by Germans in theirs Lorentz cipher. īut we change the key after each encryption breaking such encryption is computationally very hard Such a encryption can easily be broken by using a constant repeating key and using frequency analysis. The XOR operator is extremely common component in complex encryption Algorithms. To decrypt the cipher we just need to XOR the cipher with the key to regain the original text. Xor operator is just like AND(*) and OR(+) operator Mathematically, XOR encryption/cipher is additive cipher, an encryption algorithm that operates according to following principles: (A * B) + (!A * !B) The recipient, who has a copy of B in his safe, can do C XOR B and regenerate A. So for a stream of plaintext A, and a key of the same length B, you can generate cryptotext C, and send that to the recipient. The critical feature of XOR with respect to encryption is it is reversible, ie where C = A XOR B, then you can get back A using A = C XOR B. XOR, or 'exclusive or' is a 2 operand logical operation defined as: (a and b) or (not a and not b) That receiver, then takes the received string and XORs it with the key to obtain the original message: 1110 XOR <- received message You take a key, such as 0101, then you use that to XOR your string (in binary format) to achieve an encrypted string. Original = xor_crypt_string(encrypted, key=my_key) # This will obtain the original data from the encrypted ![]() ![]() This is a secret message! How fun."Įncrypted = xor_crypt_string(my_data, key=my_key) Return ''.join(chr(ord(x) ^ ord(y)) for (x,y) in izip(data, cycle(key))) Quasi-pseudo code implementation (via ): #!/usr/bin/env python You can see a truth table for this operation here: It can be used to cipher messages simply and fast. XOR is a logical operation, pronounced exclusive or. ![]()
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