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privacy enhanced mail (PEM)

Privacy Enhanced Mail (PEM) is one of the oldest standards for the encryption ofe-mails on the Internet. Both the RSA procedure and the symmetrical Data Encryption Standard (DES) or Triple DES (3DES) are provided as encryption procedures

. With Privacy Enhanced Mail (PEM), if a file

isto be sent encrypted, it is first encoded using DES

encryption with the aid of a randomly generated DES key. The DES key is then encoded with therecipient 's public key using the RSA algorithm and transmitted together with the file encrypted using the DES method. The advantage of this combined method is the low computational complexity of decrypting the DES-encrypted file and the high security provided by the RSA-encoded key

. Documents secured with PEM are suitable for data transport over networks and for signature verification. In addition, the PEM protocol accepts digital certificates according to X.509. Privacy Enhanced Mail is described in RFCs 1421 to 1424.

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Englisch: privacy enhanced mail - PEM
Updated at: 18.10.2011
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