[Cryptography] "Perpetual Encryption"

Allen allenpmd at gmail.com
Tue Mar 28 21:56:00 EDT 2017


> I wonder, is this some variant of the idea of starting with a shared
> unpredictable one-time pad K1, and sending the encrypted message (xor K1
> M1) along with (xor K1 K2), where K2 is a new unpredictable one-time pad
> to use for the next encryption?

I think the scheme is closer to this:

Mi = sequence of message bits
Ri = sequence of random bits
Pi = sequence of bits from PRNG keyed by key K

The encoder transmits Mi xor Ri, and Ri xor Pi.  The decoder generates
Pi and recovers
Mi = (Mi xor Ri) xor ((Ri xor Pi) xor Pi)

But its certainly not clear from the whitepaper.


More information about the cryptography mailing list