OpenEuphoria

Re: Data Encryption

• Posted by "Graeme." <hmi at POWERUP.COM.AU> May 16, 1998
• 731 views

I did an encrypter a while back.

It does the following.

        1) Expands the code into a 256 "ramdom" character string
        2) Loads and encrypts data from files in blocks
        3) The exact length of the blocks is determined by a
           checksum derived from the code string
        4) Starts encrypting at a derived point in each block
           XORing each byte with a character from the code
           string and a number from rand() and the value of the
           next byte *before* it is in turn encrypted (except
           for the 'last' byte, which could be any byte in the
           block) It continues encrypting forward until the end
           of the block then starts from the beginning of the
           block and works up to the 'first' byte

        Reasonable security at 15MB per minute, re-writing the
        output to a seperate file (P-120)

Graeme


----------------------------------------
Got to do one of those signiture thingys
----------------------------------------