Bedienungsanleitung VeraCrypt 1.16 (Seite 62 von 162) (Englisch)

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Parallelization

When your computer has a multi-core processor (or multiple processors), VeraCrypt uses all of the

cores (or processors) in parallel for encryption and decryption. For example, when VeraCrypt is to

decrypt a chunk of data, it first splits the chunk into several smaller pieces. The number of the

pieces is equal to the number of the cores (or processors). Then, all of the pieces are decrypted in

parallel (piece 1 is decrypted by thread 1, piece 2 is decrypted by thread 2, etc). The same method

is used for encryption.

So if your computer has, for example, a quad-core processor, then encryption and decryption are

four times faster than on a single-core processor with equivalent specifications (likewise, they are

twice faster on dual-core processors, etc).

Increase in encryption/decryption speed is directly proportional to the number of cores and/or

processors.

Note: Processors with the Hyper-Threading technology provide multiple logical cores per one

physical core (or multiple logical processors per one physical processor). When Hyper Threading is

enabled in the computer firmware (e.g. BIOS) settings, VeraCrypt creates one thread for each

logical core/processor. For example, on a 6-core processor that provides two logical cores per one

physical core, VeraCrypt uses 12 threads.

When your computer has a multi-core processor/CPU (or multiple processors/CPUs), header key

derivation is parallelized too. As a result, mounting of a volume is several times faster on a multi-

core processor (or multi-processor computer) than on a single-core processor (or a single-

processor computer) with equivalent specifications.

Pipelining

When encrypting or decrypting data, VeraCrypt uses so-called pipelining (asynchronous

processing). While an application is loading a portion of a file from a VeraCrypt-encrypted

volume/drive, VeraCrypt is automatically decrypting it (in RAM). Thanks to pipelining, the

application does not have wait for any portion of the file to be decrypted and it can start loading

other portions of the file right away. The same applies to encryption when writing data to an

encrypted volume/drive.

Pipelining allows data to be read from and written to an encrypted drive as fast as if the drive was

not encrypted (the same applies to file-hosted and partition-hosted VeraCrypt volumes).

Note: Pipelining is implemented only in the Windows

versions of VeraCrypt.

Some solid-state drives compress data internally, which appears to increase the actual read/write speed when the data

is compressible (for example, text files). However, encrypted data cannot be compressed (as it appears to consist solely

of random "noise" without any compressible patterns). This may have various implications. For example, benchmarking

software that reads or writes compressible data (such as sequences of zeroes) will report lower speeds on encrypted

volumes than on unencrypted volumes (to avoid this, use benchmarking software that reads/writes random or other kinds

of uncompressible data).

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VeraCrypt 1.16 Seite 62

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