Technical data

6
Upon the key generation stage is complete, the key sensor switches into the
waiting mode until the next key generation command. If the program has not been
restarted, the statistical control stage is skipped when the next key is generated.
Once 100 decimal digits of the key have been obtained, the algorithm picks 10
checking digits.
The resulting key can be printed out or saved onto a diskette.
Criteria and requirements for gamma quality checking
Criterion
2
for digits
There is a sequence x
1
, x
2
, ..., x
n
, where x
i
{0,1}.
Let
0
be the number of zeros in this sequence, and
1
– the number of ones.
The quality of the sequence is considered to be poor, if
0
2
1
2
2
n
n c
, where P(
2
1
> c ) = 0.001.
Criterion
2
for digrams.
Sequence x
1
, x
2
, ..., x
n
, where x
i
{0,1}, is divided into pairs y
1
, y
2
, ..., y
n/2
,
y
i
= (x
2i
, x
2i+1
), i=
12/,0 n
.
Let
i,j
– is the number of components in sequence y
1
, y
2
, ..., y
n/2
, that are equal to (i,j),
i,j = 0,1. Then, the quality of sequence y
1
, y
2
, ..., y
n/2
is considered to be poor, if
11
2
00
2
10
2
01
2
4n
n c
, where P(
2
3
> c ) = 0.001.
Criteria for gamma quality checking may be modified.
The key generating center is installed on a specially allocated computer, protected
against the E-field radiation leakage of information. Access to the room, where the computer
is located, shall be restricted, using hardware/software/organizational means for that purpose,
and the room itself must be protected.
Security of voice data
SCR-M1.2 – phone scramblers for protection of fax messages and voice signal
These devices have been designed for coding of voice signals and protection of
fax messages transmitted via a public telephone network. Utilization of latest
components, on the basis of high-efficiency signal processors by Analog Devices, has
allowed to provide a compact size, versatility of application and easy control for the
SCR-M1.2-series scramblers. All you have to do to put any of them, except for remote
controlled ones, into the encryption mode, is to press a button.
The SCR-M1.2-series scramblers are absolute selling leaders in their class in
the Russian market.
All SCR-M1.2-series scramblers are compatible with each other and can be
used to built secure communication networks of various configurations.
General characteristics of SCR-M1.2-series scramblers
Signal processing:
Analogue-digital and digital-analogue conversions;