Class CryptoReplaceFfxFpeConfig (2.0.1)

Version 2.0.1

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CryptoReplaceFfxFpeConfig(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Replaces an identifier with a surrogate using Format Preserving Encryption (FPE) with the FFX mode of operation; however when used in the ReidentifyContent API method, it serves the opposite function by reversing the surrogate back into the original identifier. The identifier must be encoded as ASCII. For a given crypto key and context, the same identifier will be replaced with the same surrogate. Identifiers must be at least two characters long. In the case that the identifier is the empty string, it will be skipped. See https://cloud.google.com/dlp/docs/pseudonymization to learn more.

Note: We recommend using CryptoDeterministicConfig for all use cases which do not require preserving the input alphabet space and size, plus warrant referential integrity.

Attributes

Name	Description
crypto_key	`.dlp.CryptoKey` Required. The key used by the encryption algorithm.
context	`.storage.FieldId` The 'tweak', a context may be used for higher security since the same identifier in two different contexts won't be given the same surrogate. If the context is not set, a default tweak will be used. If the context is set but: 1. there is no record present when transforming a given value or 2. the field is not present when transforming a given value, a default tweak will be used. Note that case (1) is expected when an ``InfoTypeTransformation`` is applied to both structured and non-structured ``ContentItem``\ s. Currently, the referenced field may be of value type integer or string. The tweak is constructed as a sequence of bytes in big endian byte order such that: - a 64 bit integer is encoded followed by a single byte of value 1 - a string is encoded in UTF-8 format followed by a single byte of value 2
common_alphabet	`.dlp.CryptoReplaceFfxFpeConfig.FfxCommonNativeAlphabet` Common alphabets.
custom_alphabet	str This is supported by mapping these to the alphanumeric characters that the FFX mode natively supports. This happens before/after encryption/decryption. Each character listed must appear only once. Number of characters must be in the range [2, 95]. This must be encoded as ASCII. The order of characters does not matter.
radix	int The native way to select the alphabet. Must be in the range [2, 95].
surrogate_info_type	`.storage.InfoType` The custom infoType to annotate the surrogate with. This annotation will be applied to the surrogate by prefixing it with the name of the custom infoType followed by the number of characters comprising the surrogate. The following scheme defines the format: info_type_name(surrogate_character_count):surrogate For example, if the name of custom infoType is 'MY_TOKEN_INFO_TYPE' and the surrogate is 'abc', the full replacement value will be: 'MY_TOKEN_INFO_TYPE(3):abc' This annotation identifies the surrogate when inspecting content using the custom infoType ```SurrogateType``

Inheritance

builtins.object > proto.message.Message > CryptoReplaceFfxFpeConfig

Classes

FfxCommonNativeAlphabet

FfxCommonNativeAlphabet(value)

These are commonly used subsets of the alphabet that the FFX mode natively supports. In the algorithm, the alphabet is selected using the "radix". Therefore each corresponds to particular radix.