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languages tags
objc
strings, ranges, enumberable

Caeser Cipher

All Characters actually have a number corresponding with them. This is known as their ASCII number. For a chart of the ASCII -> character transition take a look here. In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. Wikipedia

Exercise

You'll be writing a caeser encoder and decoder. Each method takes a string and the offset. The encoder converts the letter a with an offset of 3 to the letter d. A capital letter is always converted to a capital letter i.e Z with an offset of 2 is B. Spaces and punctuation are ignored. The decoder works in reverse.

Define and implement 2 methods in FISCaesarCipher:

-(NSString *)encodeWithMessage:(NSString *)message andOffset:(NSInteger)key
-(NSString *)decodeWithMessage:(NSString *)encodedMessage
andOffset:(NSInteger)key

Now code how to encode and decode :)

Hint

To translate from integer version to String version of a character and reverse it's pretty straight forward:

// NSString to ASCII
NSString *string = @"A";
NSInteger asciiCode = [string characterAtIndex:0]; // 65

// ASCII to NSString
NSInteger asciiCode = 65;
NSString *string = [NSString stringWithFormat:@"%c", asciiCode]; // A

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