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2. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   Definition. A digital signature scheme typically consists of three algorithms: A key generation algorithm that selects a private key uniformly at random from a set of possible private keys. The algorithm outputs the private key and a corresponding public key. A signing algorithm that, given a message and a private key, produces a signature.

3. Pretty Good Privacy - Wikipedia

   en.wikipedia.org/wiki/Pretty_Good_Privacy

   Additionally, a number of Desktop bundles are also available. Depending on the application, the products feature desktop e-mail, digital signatures, IM security, whole disk encryption, file, and folder security, encrypted self-extracting archives, and secure shredding of deleted files. Capabilities are licensed in different ways depending on ...

4. Privacy-Enhanced Mail - Wikipedia

   en.wikipedia.org/wiki/Privacy-Enhanced_Mail

   PEM data is commonly stored in files with a ".pem" suffix, a ".cer" or ".crt" suffix (for certificates), or a ".key" suffix (for public or private keys). [3] The label inside a PEM file represents the type of the data more accurately than the file suffix, since many different types of data can be saved in a ".pem" file.

5. DomainKeys Identified Mail - Wikipedia

   en.wikipedia.org/wiki/DomainKeys_Identified_Mail

   Use of the l tag in signatures makes doctoring such messages even easier. The signed copy can then be forwarded to a million recipients, for example through a botnet, without control. The email provider who signed the message can block the offending user, but cannot stop the diffusion of already-signed messages.

6. Public-key cryptography - Wikipedia

   en.wikipedia.org/wiki/Public-key_cryptography

   In a digital signature system, a sender can use a private key together with a message to create a signature. Anyone with the corresponding public key can verify whether the signature matches the message, but a forger who does not know the private key cannot find any message/signature pair that will pass verification with the public key.

7. DMARC - Wikipedia

   en.wikipedia.org/wiki/DMARC

   DMARC. Domain-based Message Authentication, Reporting and Conformance (DMARC) is an email authentication protocol. It is designed to give email domain owners the ability to protect their domain from unauthorized use, commonly known as email spoofing. The purpose and primary outcome of implementing DMARC is to protect a domain from being used in ...