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SEC-33 Tel/Fax Encryptor

1. Overview
SEC-33 Tel/Fax Encryptor applies to various public or private phone networks like PSTN, emergency satellite communication system etc. to make end-to-end encryption for client important phone call and fax information. The encryptor guarantees data security while in transmission line, thus effectively prevents clients’ sensitive information from being intercepted through transmission line.
SEC-33 encryptor can work with the key management center which is used to generate and validate keys, produce authentication medium.
System application topology as shown in Figure 1.

Figure 1: System Application Topology

 

 

The KDMC connects PC Client through serial port. KDMC Client Software can be installed to provide user management interface. The KDMC produces SEC-33 encryptor authentication medium and delivers the medium to SEC-33 encryptor offline. SEC-33 encryptor is placed in front of normal phone and fax machine to realize encrypted voice and fax communication.

 

 

2. Device Front/Rear Panel

 

(1) KDMC Front/Rear View

 

Figure 2: The KDMC Front Panel

 

 

① Power indicator: power indication

② Status indicator: indicates the status of operation

③ Management indicator: indicate management status of USB Key

④ Data indicator: indicates the status of system database

⑤ Network indicator: indicates the status of online management

⑥ USB Key indicator: indicates the status of USB Key

⑦ USB socket: USB Key access interface

 

 

Figure 3: The KDMC Rear Panel

 

 

① Power switch: power on/power off

② Power socket: for AC adaptor

③ Mode switch: set the work mode

④ Reset button: reset the KDMC and system key destruction

⑤ User interface: connect with client PC serial port

 

 

(2) SEC-33 Encryptor Front/Rear View

 

Figure 4: SEC-33 Encryptor Front Panel

 

 

① Power indicator: power indication

② Encryption indicator: when the device conducts secure communications, it is lit in green

③ Status indicator: indicates the status of operation

④ Data indicator: reserved

⑤ Telephone indicator: when SEC-33 encryptor detects voice service, it is lit in green

⑥ Fax indicator: when SEC-33 encryptor detects fax service, it is lit in green

⑦ USB socket: read authentication medium

⑧ Secure voice switch button: switch clear to secure voice.

 

 

Figure 5: SEC-33 Rear Panel

 

 

① Power switch: power on/power off

② Power socket: for AC adaptor

③ Mode switch: set the work mode of SEC-33 encryptor

④ Reset button: used for encryptor reset and key destruction

⑤ Network port: reserved

⑥ User port: reserved

⑦ Telephone socket: connect with user telephone

⑧ Fax socket: connect with user fax machine

⑨ Line socket: connect user line provided by telecom provider

 

 

3. Working Principle

 

(1) SEC-33 Encryptor KDMC Working Principle

 

The KDMC includes a management client and a KDMC device. Operator key is used to authorize the operation rights of operators. Management client is installed with management software to provide graphic interface for management operations.

 

(2) SEC-33 Encryptor Working Principle

 

Figure 6: Working Principle Diagram

 

 

Analog voice from telephone is first processed by voice processor to convert to digital voice. Digital voice is then encrypted and modulated and being transmitted through PSTN network. At the receiving end, the voice is first demodulated, then decrypted. After that, the decrypted voice is converted to analog voice. For fax, the fax signals are processed by fax processor and then encrypted. After modulation, they are sent through PSTN network. At the receiving end, the fax signals are demodulated and decrypted. After that, the decrypted fax is processed to feed the fax machine.

 

 

4. Features

 

(1) SEC-33 encryptor can be launched after identification of user identity

(2) SEC-33 encryptor divides user groups; different user groups cannot intercommunicate

(3) SEC-33 encryptor supports key change

(4) When the ECM function of the fax machine is disabled, SEC-33 encryptor can mark every receiving fax with “ENCRYPTED FILE”

(5) SEC-33 encryptor integrates encrypted voice and fax; its multi-functional feature makes it suitable for PSTN, maritime satellite network

 

 

5. Technical Specifications

 

(1) SEC-33 Encryptor KDMC Specifications

 

(a) Functions

(1) User group management: divides different user groups

(2) Key management: generates, verifies and distributes keys

(3) User identity identification: identifies operators through password

(4) Device information maintenance: adds, deletes and modifies device information

(5) Data backup and recovery: backs up and recovers key system data

(6) Log recording and query: records and queries historical operations

 

(b) Specifications

(1) Minimum signal reception level (sensibility): -43dBm

(2) Signal transmission level: -5dBm~-15dBm

(3) Maximum noise bear (S/N): 16dB

(4) Maximum adaptive channel delay: 600ms

 

(c) Others

(1) Size: 233mm×160mm×35mm (L×W×H)

(2) Overall weight: 1.2Kg

(3) Power consumption: 6W

(4) Power supply mode: DC 12V, Power adapter, AC 100-240V, 50/60Hz

(5) Environment condition:

(a) Work temperature: 0°C ~ +40°C

(b) Storage temperature: -10°C ~ +55°C

(c) Relative humidity: 20% ~ 80%

 

 

(1) SEC-33 Encryptor Specifications

 

(a) Functions

(1) Support encryption of voice, fax

(2) Support key change

(3) Communication parties negotiate temporary session keys before encrypted communication

(4) SEC-33 can be launched after user identity identification

(5) Manual key destroy while powering on

(6) Voice/fax auto identification

(7) Automatically identify and receive clear/secure fax, and it is forbidden to send clear fax

(8) Clear/Secure mode indication

(9) When the ECM function of the fax machine is disabled, SEC-33 can mark every receiving fax with “ENCRYPTED FILE”

(10) Support self-test, malfunction indication and malfunction prompt tone

 

(b) Specifications

(1) Voice communication speed: 1.2kbps~4.8kbps

(2) Fax communication speed: 2.4kbps~14.4kbps

(3) Minimum signal reception level (sensibility): -43dBm

(4) Signal transmission level: -5dBm~-15dBm

(5) Maximum noise bear (S/N): 16dB

(6) Maximum adaptive channel delay: 1000ms

 

(c) Others

(1) Appearance: desktop equipment

(2) Size: 233mm×160mm×35mm (L×W×H)

(3) Net weight: 1.2Kg

(4) Power consumption: 6W

(5) Power supply mode: DC 12V, Power adapter, AC 100-240V±10%, 50/60Hz

(6) Environment condition:

(a) Work temperature: 0°C ~ +40°C

(b) Storage temperature: -10°C ~ +55°C

(c) Relative humidity: 20% ~ 80%

SEC-33 Tel/Fax Encryptor
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