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OpenSSL salted format - Just Solve the File Format Problem

OpenSSL salted format

From Just Solve the File Format Problem
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File Format
Name OpenSSL salted format
Ontology

OpenSSL salted format is our name for the file format OpenSSL usually uses when writing password-protected encrypted files.

Contents

Format

Files have an 8-byte signature, followed by an 8(?)-byte salt. Following the salt is the encrypted data.

The salt and password are to be combined in a particular way, to derive the encryption key and initialization vector.

No information about which encryption cipher was used is stored in the file. In order to decrypt the file, the cipher must be known by external means, or guessed. (Obviously, the same goes for the password.)

Identification

Files begin with an 8-byte signature: the ASCII characters "Salted__".

Example

To encrypt a file:

$ openssl aes-128-cbc -in secret.txt -out secret.txt.enc

To decrypt:

$ openssl aes-128-cbc -d -in secret.txt.enc -out secret2.txt

Software

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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