MmoCryptMethod (Property)

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128-bit, 192-bit and 256-bit AES encryption with OFB mode of operation

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KeyExpression (Example)

OperationLogDirectory

Password

PasswordProtected

PersistedCalculatedItem

RepeatableReadSupported

128-bit, 192-bit and 256-bit AES encryption with OFB mode of operation

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WEBDEV

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See also

MmoCryptMethod (Property)

In french: CryptageMmo

Available only with these kinds of connection

The MmoCryptMethod property is used to set the encryption method of the memo file (.MMO) associated with the data file. You can:

Find out the encryption mode of a memo file associated with a data file (file defined in the data model editor or through programming).
Define the encryption mode of a memo file associated with a data file during its description through programming.

Example

// Find out the encryption mode of the memo file associated with the Customer data file
ResEncrypt = Customer.MmoCryptMethod

Syntax

Finding out the encryption mode of a MMO file Hide the details

<Current encryption mode> = <Data file>.MmoCryptMethod

<Current encryption mode>: Integer constant

The encryption modes are:
hEncryptionAES128 Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted using a 128-bit AES algorithm with Output feedback (OFB).
hEncryptionAES192 Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted using a 192-bit AES algorithm with Output feedback (OFB).
hEncryptionAES256 Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted using a 256-bit AES algorithm with Output feedback (OFB).
hEncryptionAuto Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted according to an optimized encryption algorithm (RC5 16 rounds on 128 bits).
hEncryptionNO No encryption is performed on the file.
hEncryptionRC5_12 The memo file is encrypted according to an optimized encryption algorithm (RC5 12 rounds on 128 bits).
hEncryptionRC5_16 The memo file is encrypted according to an optimized encryption algorithm (RC5 16 rounds on 128 bits).
hEncryptionStandard The memo file is encrypted according to an optimized 128 bits encryption algorithm.

<Data file>: Character string

Name of the data file used. This name was defined in the data model editor or with the File Description type.

Defining the encryption mode of a MMO file Hide the details

<Data file>.MmoCryptMethod = <New encryption mode>

<Data file>: Character string

Name of the data file used. This name was defined by the File Description type.

<New encryption mode>: Integer constant

The encryption modes are:
hEncryptionAES128 Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted using a 128-bit AES algorithm with Output feedback (OFB).
hEncryptionAES192 Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted using a 192-bit AES algorithm with Output feedback (OFB).
hEncryptionAES256 Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted using a 256-bit AES algorithm with Output feedback (OFB).
hEncryptionAuto Encryption is performed only if a password is set for the data file. In this case, the memo file is encrypted according to an optimized encryption algorithm (RC5 16 rounds on 128 bits).
hEncryptionNO No encryption is performed on the file.
hEncryptionRC5_12 The memo file is encrypted according to an optimized encryption algorithm (RC5 12 rounds on 128 bits).
hEncryptionRC5_16 The memo file is encrypted according to an optimized encryption algorithm (RC5 16 rounds on 128 bits).
hEncryptionStandard The memo file is encrypted according to an optimized 128 bits encryption algorithm.

Remarks

128-bit, 192-bit and 256-bit AES encryption with OFB mode of operation

If the Memo file is encrypted using the AES algorithm, it is necessary to use the same method to encrypt the data (FicCryptMethod property) and the indexes (NdxCryptMethod property).
If there is encryption that uses the AES algorithm, the option "High security level with password" is automatically applied.