SECURED CHANNEL WITH AUTHENTICATION Russian patent published in 2009 - IPC H04L9/08 

FIELD: physics, computer engineering.

SUBSTANCE: invention is related to the field of cryptography, mainly, to protected channel with authentication, and in particular, for calculation of session keys for creation of such channels to protect digital content. For the purpose the first single-range device selects the first short-term session key x and calculates the first corresponding short-term open key g^x, which is sent to the second single-range device. The second single-range device calculates the second short-term open key g^y in similar manner and short-term key (K_ePh) for collective use, determines hash-value for g^y, K_eph, K_perm and its identifier, and sends g^y and hash-value to the first from single-range devices. The first single-range device calculates K_eph, verifies hash-value and determines hash-value for g^x, K_eph, K_perm and its identifier and sends it to the second single-range device so that it verifies this hash-value. Afterwards both single-range devices receive session key with the help of hash coding of K_eph. Devices may later use session key for establishment of protected channel with authentication (SAC).

EFFECT: increased cryptographic security of channel with authentication.

6 cl, 1 dwg