|The Open–source PKI Book: A guide to PKIs and Open–source Implementations|
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Global Technologies Group, Inc. sells the PowerCrypt Encryption Accelerator, a hardware crypto accelerator that is compatible with OpenBSD, FreeBSD and Linux. It is based on the HiFn 7751 crypto acceleration chip that is compatible with the IPsec standards. Currently it only supports symmetric cryptography while assymetric cryptography is planned for the future.