S2S Security Header Level 2

To initiate the beginning of a secured area and to provide the parameters needed for authentication or encryption of a transaction set

Position: S2S-01 · Element: 990 · Name: Security Type · Type: Identifier (ID) · Requirement: Mandatory · Min: 2 · Max: 2 · Repeat: -

Code identifying the security algorithms and methods applied for this level of interchange

If S2S01 is "AA", "BB", "AC" or "BC", then S2S04 is required.

If S2S01 is "BB", "EE", "AC" or "EC", then S2S06 is required.

Position: S2S-02 · Element: 824 · Name: Security Originator Name · Type: String (AN) · Requirement: Mandatory · Min: 1 · Max: 64 · Repeat: -

Unique designation (identity) of the cryptographic process that performs authentication or encryption on data to be interchanged, or originates a cryptographic service message Note: X9 has a minimum length of 4 characters for the security originator; no mechanism, or registration method is provided by X9 or X12 to guarantee the uniqueness of the identifier

X9 has a required minimum length of four characters for S2S02 (security originator). No mechanism, or registration method, is provided by X9 or X12 to guarantee uniqueness of the identifier.

Position: S2S-03 · Element: 825 · Name: Security Recipient Name · Type: String (AN) · Requirement: Optional · Min: 1 · Max: 64 · Repeat: -

Unique designation (identity) of the cryptographic process that performs authentication or decryption on received data, or is the destination of a cryptographic service message Note: X9 has a minimum length of 4 characters for the security recipient; no mechanism, or registration method is provided by X9 or X12 to guarantee the uniqueness of the identifier

X9 has a required minimum length of four characters for S2S03 (security recipient). No mechanism, or registration method, is provided by X9 or X12 to guarantee uniqueness of the identifier.

Position: S2S-04 · Element: 991 · Name: Authentication Key Name · Type: String (AN) · Requirement: Conditional · Min: 1 · Max: 64 · Repeat: -

Name of the key used for authentication; this name is mutually known to the security originator and the security recipient, is unique for this relationship, and is intended to allow the changing of the key from time to time Note: The special key name "0123456789ABCDEF" is reserved for the hexidecimal value 0123456789ABCDEF (i.e. a fixed non-secret value) to provide a well-known value for data integrity testing only)

P0405: If either S2S-04 or S2S-05 is present, then the other is required

In S2S04 the special name "01234567890ABCDEF" is reserved for the hexadecimal value 01234567890ABCDEF (i.e., a fixed nonsecret value) to provide a well-known value for data-integrity testing only.

Position: S2S-05 · Element: 992 · Name: Authentication Service Code · Type: Identifier (ID) · Requirement: Conditional · Min: 1 · Max: 1 · Repeat: -

Authentication options

S2S-06 C031 Encryption Key Information Composite (composite) Conditional

Position: 01 · Element: 993 · Name: Encryption Key Name · Type: String (AN) · Requirement: Mandatory · Min: 1 · Max: 64 · Repeat: -

Name of the key used for encryption; this name is mutually known to the security originator and the security recipient, is unique for this relationship, and is intended to allow the changing of the key from time to time Note: If any of the optional fields are present, the Key Name should contain either "PUBLIC" if a public key is being used to encrpyt the one-time key or the actual name of the asymmetric key-encrypting-key used to encrypt the one-time key.

Position: 02 · Element: 1564 · Name: Protocol ID · Type: Identifier (ID) · Requirement: Optional · Min: 3 · Max: 3 · Repeat: -

Code specifying protocol used to encrypt the session key

Position: 03 · Element: 1565 · Name: Look-up Value · Type: String (AN) · Requirement: Optional · Min: 1 · Max: 4,096 · Repeat: -

Value used to identify a certificate containing a public key

Position: 04 · Element: 1566 · Name: Keying Material · Type: String (AN) · Requirement: Optional · Min: 1 · Max: 512 · Repeat: -

Additional material required for decrypting the one-time key

Position: 05 · Element: 1567 · Name: One-time Encryption Key · Type: String (AN) · Requirement: Optional · Min: 1 · Max: 512 · Repeat: -

Hexadecimally filtered encrypted one-time key

S2S-07 C032 Encryption Service Information Composite (composite) Conditional

Position: 01 · Element: 994 · Name: Encryption Service Code · Type: Identifier (ID) · Requirement: Mandatory · Min: 1 · Max: 3 · Repeat: -

Coded values representing options for encryption processing, including the use of compression and filtering; the code either defines the encryption mode and the transmission filter specification for filtering binary data into transmittable text or specifics that the following subelements define these values

Position: 02 · Element: 1568 · Name: Algorithm ID · Type: Identifier (ID) · Requirement: Optional · Min: 3 · Max: 3 · Repeat: -

Algorithm used for Encryption

Position: 03 · Element: 1569 · Name: Algorithm Mode of Operation · Type: Identifier (ID) · Requirement: Optional · Min: 3 · Max: 3 · Repeat: -

Mode of Operation of the Encryption Algorithm

Position: 04 · Element: 1570 · Name: Filter ID Code · Type: Identifier (ID) · Requirement: Conditional · Min: 3 · Max: 3 · Repeat: -

Code specifying the type of filter used to convert data code values

P0405: If either C032-04 or C032-05 is present, then the other is required

Position: 05 · Element: 799 · Name: Version Identifier · Type: String (AN) · Requirement: Conditional · Min: 1 · Max: 30 · Repeat: -

Revision level of a particular format, program, technique or algorithm

Position: 06 · Element: 1571 · Name: Compression ID · Type: Identifier (ID) · Requirement: Conditional · Min: 3 · Max: 3 · Repeat: -

Type of Compression Used

P0607: If either C032-06 or C032-07 is present, then the other is required

Position: 07 · Element: 799 · Name: Version Identifier · Type: String (AN) · Requirement: Conditional · Min: 1 · Max: 30 · Repeat: -

Revision level of a particular format, program, technique or algorithm

Position: S2S-08 · Element: 995 · Name: Length of Data · Type: Numeric (N) · Requirement: Conditional · Min: 1 · Max: 18 · Repeat: -

Length of data is the number of character positions of the compressed or encrypted/filtered text; when data is plain text, this field shall be absent

Position: S2S-09 · Element: 996 · Name: Initialization Vector · Type: String (AN) · Requirement: Conditional · Min: 16 · Max: 16 · Repeat: -

The archival representation of a 64-bit value expressed in hexadecimal notation as 16 ASCII characters from the set of characters (0..9, A..F); the 64-bit value is used as a starting point for encryption of a data sequence to increase security by introducing cryptographic variance and to synchronize cryptographic equipment; a new Initialization Vector (IV) shall be used for each message; the IV shall not be intentionally reused; the 64-bit binary value, not its ASCII representation, is used for the cryptographic process; in the interchange process, the resultant encrypted and filtered 64-bit IV is sent; the hexadecimal notation is the representation for archiving purposes; the IV shall be a random or pseudo-random number; when encrypted, the IV must be decrypted using the Electronic Code Book (ECB) mode and the same key used to encrypt the message