DiskCryptor was the first opensource on-the-fly full disk encryption program for MS Windows that allowed the Windows boot partition to be encrypted, in addition to other non-bootable partitions, and provided boot-time authentication.
It was written by a Russian developer under the pseudonym "ntldr", and was first released in 2007 as an open-source alternative to DriveCrypt and PGPDisk. With an English language GUI, it uses AES-256 in LRW mode, and has a volume format compatible with that used by TrueCrypt. As a result, volumes created by DiskCryptor can be mounted by versions of TrueCrypt from 4.3 onwards, making DiskCryptor volumes accessable on Linux and Mac OS X systems, to which TrueCrypt has been ported but DiskCryptor has not.
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