SSL Glossary

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D

Data Encryption Algorithm
An ANSI Standard that describes a cryptographic algorithm for encrypting data. The algorithm is private key driven and forms a vital element of PKI services. Also referred to as the Data Encryption Standard (DES).
Data Encryption Standard
See Data Encryption Algorithm
Data Integrity
Data Integrity is a formal definition of comprehensive rules and the consistent application of those rules to assure high integrity data. It consists of techniques to determine how well data are maintained in the data resource and to ensure that the data resource contains data that have high integrity.
Decryption
Decryption is the process of transforming ciphertext back into plaintext.
Designated Approving Authority (DAA)
An example would be the secure server administrator having the authority to make a decision on accepting the security safeguards that are prescribed or the administrator who might be responsible for issuing an accreditation statement which records the pronouncement to accept those safeguards.
Digital Certificates
Digital authentication systems have become an essential part of e-business on the Web. Using very sophisticated encryption techniques, digital signatures allow ecommerce organizations to electronically certify their identity, online payment, or Two Factor authentication security of any electronic document. Like a passport, Digital Certificates offer access, through the use of a private key and a public key. The two keys work together to verify and authenticate data with an encrypted "fingerprint" that can be used to verify the contents of the certificate, or "cert". Digital certificates are issued by trusted Certificate Authorities. For instance, the public key of the ecommerce merchant's digital certificate is used to encrypt the shopper's order before it is delivered to him.
Digital Signature
A digital signature (not to be confused with a digital certificate) is an electronic rather than a written signature. It can be used with any kind of message, whether it is encrypted or not, simply so that the receiver can be sure of the sender's identity and that the message arrived intact. A digital certificate contains the digital signature of the certificate-issuing authority so that anyone can verify that the certificate is real. Additional benefits of using a digital signature are that it is easily transportable, cannot be easily repudiated, cannot be imitated by someone else, and can be automatically time-stamped.
Digital Signature Algorithm (DSA)
An algorithm for producing digital signatures is developed by National Institute of Standards and Technology (NIST) and the National Security Agency (NSA).
Digital Signature Standard (DSS)
A NIST standard for digital signatures, used for secure authentication of both a message and the signer. DSS has a security level comparable to RSA (Rivest-Shamir-Adleman) cryptography, having 1024bit or 2048-bit keys.
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