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Digital Signature
SSL Digital Signatures use public key cryptography with a digital code to verify the Identity of electronically transmitted messages, or to authenticate a message uniquely. A private key is used, showing that the signature belongs to the owner of that key. A secure hash of the document is signed, so that any alteration the document will invalidate the digital signature.
Digital signatures are critcally important for ecommerce and are a key component of most authentication/verification schemes. Digital signatures use the Challenge Handshake Authentication Protocol, and should not be susceptible to penetration. There are several different encryption techniques to guarantee this level of security. AES (US Advanced Encryption Standard) is a symmetric encryption algorithm known as Rijndael which uses 128, 192 or 256-bit keys. It also supports Blowfish, and Twofish, the runner-up candidate for AES. For public-key encryption, the most well-known is the RSA algorithm with unlimited key sizes.
DSA
The Digital Signature Algorithm was mandated by the Federal Information Processing Standard for Digital signatures. A public key system that can only be used for verifying secure signatures.
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