.EFR File Extension
Encryptafile Private Key File
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What is an EFR file?
Private Key used to authenticate an encrypted Encryptafile (.EFL) file; contains a hexadecimal representation of the private key used to created the digital signature for the file.
The length of a private key file must be greater than or equal to 16 bits, and less than or equal to 7128 bits.
Programs that open or reference EFR files