FED-STD-1028 Telecommunications: Interoperability And Security Requirements For Use Of The Data Encryption Standard With Ccitt Group 3 Facsimile EquipmentThis standard specifies interoperability and security related requirements for the use of encryption with CCITT i.e., International Telegraph and Telephone Consultative Committee\) Group 3-type facsimile equipment. The algorithm used for encryption is the Data Encryption Standard \(DES\), described in Federal Information Processing Standards Publication 46. Requirements contained in section 3 below relate to the interoperation of DES Cryptographic Equipment, or their operation with associated CCITT Group 3 facsimile equipment. Additional security requirements, not directly relating to interoperability, are contained in Federal Standard 1027.

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ON) from a primary (i.e., CCITT V.27 ter or V.29) modem, the modem output (e.g.,

CCITT Interchange Circuit 104, Received Data)

is typically in a MARK (all ONES) state. The 48 bits received immediately

following the first ZERO bit (SPACE) are considered to

be the Initializing Vector. All following bits received are decrypted.

Decryption continues until Receiver Ready indication is turned

off.

3.5

Encryption Bypass. Except when DES Cryptographic Equipment is in the

bypass mode (reference Federal Standard 1027), it shall

not be possible to transmit or receive unencrypted facsimile documents or

portions thereof (including Group 1 and 2 documents).

3.6

DES Key Variable Loading. The capability shall exist to operate (i.e.,

encrypt and decrypt facsimile documents) with DES 5 key

variables loaded using one of the two methods described in Federal Standard

1027.

Effective Date. The use of this standard by U.S. government departments

and agencies is mandatory effective 180 days following

the date of this standard.

Changes. When a Government department or agency considers that this

standard does not provide for its essential needs, a statement

citing specific requirements shall be sent in duplicate to the General Services

Administration (K), Washington, DC, 20405, in

accordance with the provisions of the Federal Information Resources Management

Regulation 201-8.101-3. The General Services

Administration will determine the appropriate action to be taken and will notify

the agency.

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