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  2. Self-signed certificate - Wikipedia

    en.wikipedia.org/wiki/Self-signed_certificate

    For example, the validity dates of a self-signed certificate might not be trusted because the entity could always create and sign a new certificate that contained a valid date range. The values in a self-signed certificate can only be trusted when the values were verified out-of-band during the acceptance of the certificate, and there is a ...

  3. Simple Certificate Enrollment Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Certificate...

    Due to the use of the self-signed PKCS#10 format for Certificate Signing Requests (CSR), certificates can be enrolled only for keys that support (some form of) signing. A limitation shared by other enrollment protocols based on PKCS#10 CSRs, e.g., EST and ACME , or even the web-based enrollment workflow of most PKI software where the requester ...

  4. Cisco IOS - Wikipedia

    en.wikipedia.org/wiki/Cisco_IOS

    The Cisco IOS monolithic kernel does not implement memory protection for the data of different processes. The entire physical memory is mapped into one virtual address space. The Cisco IOS kernel does not perform any memory paging or swapping. Therefore the addressable memory is limited to the physical memory of the network device on which the ...

  5. Certificate revocation list - Wikipedia

    en.wikipedia.org/wiki/Certificate_revocation_list

    Expiration dates are not a substitute for a CRL. While all expired certificates are considered invalid, not all unexpired certificates should be valid. CRLs or other certificate validation techniques are a necessary part of any properly operated PKI, as mistakes in certificate vetting and key management are expected to occur in real world ...

  6. Certificate signing request - Wikipedia

    en.wikipedia.org/wiki/Certificate_signing_request

    In public key infrastructure (PKI) systems, a certificate signing request (CSR or certification request) is a message sent from an applicant to a certificate authority of the public key infrastructure (PKI) in order to apply for a digital identity certificate. The CSR usually contains the public key for which the certificate should be issued ...

  7. Fix security certificate error messages in Internet Explorer

    help.aol.com/articles/message-the-security...

    Seeing security certificate errors when visiting certain websites? Learn how to remedy this issue in Internet Explorer.

  8. Certificate authority - Wikipedia

    en.wikipedia.org/wiki/Certificate_authority

    Any site using self-signed certificates acts as its own CA. Commercial banks that issue EMV payment cards are governed by the EMV Certificate Authority, [ 5 ] payment schemes that route payment transactions initiated at Point of Sale Terminals ( POS ) to a Card Issuing Bank to transfer the funds from the card holder's bank account to the ...

  9. Certificate revocation - Wikipedia

    en.wikipedia.org/wiki/Certificate_revocation

    Let's Revoke uses bit vectors of revocation statuses (called certificate revocation vectors, or CRVs) to allow large amounts of revocation statuses to be efficiently retrieved by clients. [4] CAs generate CRVs for their own certificates, with one CRV per expiration date. CRV maintenance for CAs is linear in the number of certificates issued ...