| 摘要 |
A symmetric method for cryptography of a binary file is disclosed, comprising decomposition of the binary file in blocks (A1, ... An) of 256 bytes. Said system provides for the use of passkeys (P1, P2, P3) composed of integers and of an encryption function (F) that returns a position value (c) according to the passkey. So, at least one counter text (S1) is generated, being composed of one string of 256 bytes containing position values (c) calculated starting from an initial sequence (S0) and at least one notation of memory (N 11 , ... N 33 ) composed of one string of 256 bytes containing position values (c) calculated starting from the counter text (S1). The byte values of the counter text (S1) and notation of memory (N 11 , ... N 33 ) are used to code the blocks of the binary file and decode the coded blocks. |
