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What is a UTF-8 string?
UTF-8 is an encoding system for Unicode. It can translate any Unicode character to a matching unique binary string, and can also translate the binary string back to a Unicode character. Characters that appear later in the Unicode library are encoded as two-byte, three-byte, and eventually four-byte binary units.
How is UTF-8 encoded?
UTF-8 is a byte encoding used to encode unicode characters. UTF-8 uses 1, 2, 3 or 4 bytes to represent a unicode character. Remember, a unicode character is represented by a unicode code point. Thus, UTF-8 uses 1, 2, 3 or 4 bytes to represent a unicode code point.
Is ASCII an encoding?
So, ASCII can refer both to an encoding and the set of characters it supports, but in remaining modern use (especially in cases where an escape mechanism allows for other characters to be indirectly represented, such as character entity references) it’s mostly referred to as an encoding.
Why do you xor two strings in UTF8?
Assuming (!) the strings are of equal length, why not convert the strings to byte arrays and then XOR the bytes. The resultant byte arrays may be of different lengths too depending on your encoding (e.g. UTF8 will expand to different byte lengths for different characters).
Is the XOR operation with two strings valid?
The same is valid if you first convert your Strings to UTF-8 and then XOR these bytes – here you quite probably will end up with a byte sequence which is not valid UTF-8, if your Strings were not already both pure ASCII strings.
Why do you have to XOR each Charat in Java?
The base64 encoding is done because xor’ing the bytes of a string may not give valid bytes back for a string. Note: this only works for low characters i.e. below 0x8000, This works for all ASCII characters. I would do an XOR each charAt () to create a new String.
What happens when you XOR ” a ” and ” æ “?
If your input/output is utf-8 and you xor “a” and “æ”, you are left with an invalid utf-8 string consisting of one character (decimal 135, a continuation character). It is the char values which are being xor’ed, but the byte values and this produces a character whichc an be UTF-8 encoded.