Data conversion systems and methods
In various embodiments, a computer-readable memory medium coupled to a processor is disclosed. The memory medium is configured to store instructions which cause the processor to retrieve a seed value, receive a digital bit stream, generate a stream of random bits, using the seed value as a seed to a pseudo random number generator (PRNG), wherein the stream of random bits contains at least as many bits as the digital bit stream, shuffle bits of the stream of random bits to create a random bit buffer, generate an obfuscated digital bit stream by applying a first exclusive OR (XOR) to the digital bit stream and the random bit buffer, wherein the obfuscated digital bit stream has the same number of bits as the digital bit stream, and provide the obfuscated digital bit stream to the communications interface.
1. A communications device comprising:
a communications interface;
a processor; and
a non-transient computer-readable memory medium operatively coupled to the processor, wherein the memory medium is configured to store instructions configured to cause the processor to:
retrieve a seed value;
receive a digital bit stream;
generate a stream of random bits comprising at least as many bits as the digital bit stream, using the seed value as a seed to a pseudo random number generator (PRNG);
generate a random bit buffer by swapping at least two bits or flipping at least one bit of the stream of random bits;
generate an obfuscated digital bit stream by applying a first exclusive OR (XOR) to the digital bit stream and the random bit buffer, wherein the obfuscated digital bit stream has the same number of bits as the digital bit stream; and
provide the obfuscated digital bit stream to the communications interface.
2. The communications device of claim 1 , wherein the stream of random bits consists of a power of two number of bytes.
3. The communications device of claim 1 , wherein the instructions are further configured to cause the processor to shuffle the bits of the stream of random bits such that the processor:
initializes the random bit buffer;
transverses the bits in the stream of random bits and for each bit that is set, calculates a destination bit location; and
flips the bit in the random bit buffer at the destination bit location.
4. The communications device of claim 3 , wherein the instructions are further configured to cause the processor to initialize the random bit buffer such that the processor sets all of the bits of the random bit buffer to be the same value.
5. The communications device of claim 3 , wherein the instructions are further configured to cause the processor to initialize the random bit buffer such that the processor sets all of the bits of the random bit buffer to be 0.
6. The communications device of claim 3 , wherein the instructions are configured to cause the processor to calculate the destination bit location using a table lookup.
7. The communications device of claim 1 , wherein the instructions are further configured to cause the processor to:
calculate a CRC of the digital bit stream; and
modify the digital bit stream, prior to generating the obfuscated digital bit stream, such that the digital bit stream includes the CRC.
8. A computer-implemented method for obfuscating data comprising:
retrieving a seed value;
receiving a digital bit stream;
generating a stream of random bits comprising at least as many bits as the digital bit stream, using the seed value as a seed to a pseudo random number generator (PRNG);
generating a random bit buffer by swapping at least two bits or flipping at least one bit of the stream of random bits; and
generating an obfuscated digital bit stream by applying a first exclusive OR (XOR) to the digital bit stream and the random bit buffer, wherein the obfuscated digital bit stream has the same number of bits as the digital bit stream.
9. The computer-implemented method of claim 8 , further comprising:
initializing the random bit buffer;
traversing the bits in the stream of random bits and for each bit that is set, calculating a destination bit location; and
flipping the bit in the random bit buffer at the destination bit location.
10. The computer-implemented method of claim 9 , wherein initializing the random bit buffer sets all of the bits of the random bit buffer to be the same value.
11. The computer-implemented method of claim 9 , wherein calculating the destination bit comprises using a table lookup.
12. The computer-implemented method of claim 8 , wherein:
the stream of random bits consists of a power of two number of bytes.
13. The computer-implemented method of claim 9 , wherein
initializing the random bit buffer sets all of the bits of the random bit buffer to be 0.
14. The computer-implemented method of claim 8 , further comprising:
calculating a CRC of the digital bit stream; and
modifying the digital bit stream, prior to generating the obfuscated digital bit stream, such that the digital bit stream includes the CRC.
15. A non-transient computer-readable memory medium configured to store instructions thereon that when loaded by a processor cause the processor to:
retrieve a seed value;
receive a digital bit stream;
generate a stream of random bits containing of at least as many bits as the digital bit stream, using the seed value as a seed to a pseudo random number generator (PRNG);
generate a random bit buffer by swapping at least two bits or flipping at least one bit of the stream of random bits;
generate an obfuscated digital bit stream by applying a first exclusive OR (XOR) to the digital bit stream and the random bit buffer, wherein the obfuscated digital bit stream has the same number of bits as the digital bit stream; and
provide the obfuscated digital bit stream to a communications interface.
16. The non-transient computer-readable memory medium of claim 15 , wherein the instructions stored thereon further cause the processor to:
generate the stream of random bits such that the stream of random bits consists of a power of two number of bytes.
17. The non-transient computer-readable memory medium of claim 15 , wherein the instructions stored thereon further cause the processor to:
initialize the random bit buffer;
traverse the bits in the stream of random bits and for each bit that is set, calculate a destination bit location;
flip the bit in the random bit buffer at the destination bit location.
18. The non-transient computer-readable memory medium of claim 17 , wherein the instructions stored thereon further cause the processor to:
initialize the random bit buffer such that all of the bits of the random bit buffer are set to be the same value.
19. The non-transient computer-readable memory medium of claim 17 , wherein the instructions stored thereon further cause the processor to:
calculate the destination bit location using a lookup table.
20. The non-transient computer-readable memory medium of claim 15 , wherein the instructions stored thereon further cause the processor to:
calculate a CRC of the digital bit stream; and
modify the digital bit stream, prior to generating the obfuscated digital bit stream, such that the digital bit stream includes the CRC.