Encryption Topics

• physical security measures
• digital rights management
• non repudiation
• encryption product
• trojan horse
• g software
• robert richardson
• backup drives
• legal purposes
• security survey
• ciphertext
• confidential data
• cryptographic software
• personal records
• storage devices
• computer crime
• p19
• flash drives
• mobile users
• copy protection

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Encryption, Encryption

The result of the process is encrypted information (in cryptography, referred to as ciphertext). In many contexts, the word encryption also implicitly refers to the reverse process, decryption (e.g. software for encryption can typically also perform decryption), to make the encrypted information readable again (i.e. to make it unencrypted).

For example, in 2007 the U.S. government reported that 71% of companies surveyed utilized encryption for some of their data in transit. 2008 CSI Computer Crime and Security Survey, by Robert Richardson, p19 Encryption can be used to protect data "at rest", such as files on computers and storage devices (e.g. USB flash drives). In recent years there have been numerous reports of confidential data such as customers' personal records being exposed through loss or theft of laptops or backup drives. Encrypting such files at rest helps protect them should physical security measures fail. Digital rights management systems which prevent unauthorized use or reproduction of copyrighted material and protect software against reverse engineering (see also copy protection) are another somewhat different example of using encryption on data at rest.

Standards and cryptographic software and hardware to perform encryption are widely available, but successfully using encryption to ensure security may be a challenging problem. A single slip-up in system design or execution can allow successful attacks. Sometimes an adversary can obtain unencrypted information without directly undoing the encryption. See, e.g., traffic analysis, TEMPEST, or Trojan horse.

First, e-mail must be digitally signed at the point it was created to provide non-repudiation for some legal purposes, otherwise the sender could argue that it was tampered with after it left their computer but before it was encrypted at a gateway according to Paul. An encryption product may also not be practical when mobile users need to send e-mail from outside the corporate network.

Source: Wikipedia > Encryption