Best of email security 2013

Email Security Guidelines, Encryption and Appliances

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  • cryptographic checksum

    A cryptographic checksum is a mathematical value (called a checksum) that is assigned to a file and used to "test" the file at a later date to verify that the data contained in the file has not been maliciously changed. 

  • MPPE (Microsoft Point-to-Point Encryption)

    MPPE (Microsoft Point-to-Point Encryption) is a method of encrypting data transferred across Point-to-Point Protocol (PPP)-based dial-up connections or Point-to-Point Tunneling Protocol (PPTP) virtual private network (VPN) connections. 

  • cryptoperiod (key lifetime or a validity period)

    A cryptoperiod (sometimes called a key lifetime or a validity period) is a specific time span during which a cryptographic key setting remains in effect. 

  • output feedback (OFB)

    In cryptography, output feedback (OFB) is a mode of operation for a block cipher. 

  • ciphertext feedback (CFB)

    Ciphertext feedback (CFB) is a mode of operation for a block cipher. In contrast to the cipher block chaining (CBC) mode, which encrypts a set number of bits of plaintext at a time, it is at times desirable to encrypt and transfer some plaintext valu... 

  • decipher

    All three terms - decipher, decrypt, and decode - mean to convert ciphertext into the original, unencrypted plaintext. 

  • Electronic Code Book (ECB)

    Electronic Code Book (ECB) is a mode of operation for a block cipher, with the characteristic that each possible block of plaintext has a defined corresponding ciphertext value and vice versa. 

  • crypto

    Depending on its usage, crypto can be a short form for cryptography or for encryption. 

  • stream cipher

    A stream cipher is a method of encrypting text (to produce ciphertext) in which a cryptographic key and algorithm are applied to each binary digit in a data stream, one bit at a time. 

  • Pretty Good Privacy (PGP)

    Pretty Good Privacy (PGP) is a popular program used to encrypt and decrypt e-mail over the Internet.