• SYN flood (half open attack)

    SYN flooding is a method that the user of a hostile client program can use to conduct a denial-of-service (DoS) attack on a computer server.

  • digital certificate

    A digital certificate is an electronic "passport" that allows a person, computer or organization to exchange information securely over the Internet using the public key infrastructure (PKI). A digi...

  • COBIT

    COBIT  is a framework for developing, implementing, monitoring and improving information technology (IT) governance and management practices.

  • computer forensics (cyber forensics)

    Computer forensics is the application of investigation and analysis techniques to gather and preserve evidence from a particular computing device in a way that is suitable for presentation in a cou...

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  • walled garden

    On the Internet, a walled garden is an environment that controls the user's access to Web content and services. 

  • in the wild

    According to noted computer virus expert Paul Ducklin, in order for a virus to be considered in the wild, "it must be spreading as a result of normal day-to-day operations on and between the computers of unsuspecting users. 

  • Chernobyl virus

    The Chernobyl virus is a computer virus with a potentially devastating payload that destroys all computer data when an infected file is executed. 

  • 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. 

  • 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... 

  • MD5

    MD5 is an algorithm that is used to verify data integrity through the creation of a 128-bit message digest from data input (which may be a message of any length) that is claimed to be as unique to that specific data as a fingerprint is to the specifi... 

  • MD4

    MD4 is an earlier version of MD5, an algorithm used to verify data integrity through the creation of a 128-bit message digest from data input (which may be a message of any length) that is claimed to be as unique to that specific data as a fingerprin... 

  • MD2

    MD2 is an earlier, 8-bit version of MD5, an algorithm used to verify data integrity through the creation of a 128-bit message digest from data input (which may be a message of any length) that is claimed to be as unique to that specific data as a fin... 

  • decipher

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

  • server accelerator card (SSL card)

    A server accelerator card (also known as an SSL card) is a Peripheral Component Interconnect (PCI) card used to generate encryption keys for secure transactions on e-commerce Web sites.