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No difference. E-signature is the catchy marketing name the government put on digital signatures. PKI provides the means of managing digital certificates. Digital certificates contain public keys for individuals or entities. A digital signature uses a digital signature algorithm such as RSA or SHA1. Yes, it is a cryptographic algorithm.
For more information on this topic, visit these other searchSecurity resources:
Best Web Links: Digital Signatures
Executive Security Briefing: It's a matter of trust: Digital certificates and e-signatures
Ask the Expert: What is a digital signature?
Dig Deeper on PKI and Digital Certificates
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