Applied Cryptography & Public Key Infrastructure (PKI)
Applied Cryptography involves using mathematical techniques and algorithms to secure digital information, ensuring confidentiality, integrity, and authenticity. Public Key Infrastructure (PKI) is a framework that manages digital keys and certificates, enabling secure communication and authentication over networks. Together, they underpin secure transactions, data protection, and trust in digital environments by facilitating encryption, digital signatures, and identity verification for users and devices.
Applied Cryptography & Public Key Infrastructure (PKI)
Applied Cryptography involves using mathematical techniques and algorithms to secure digital information, ensuring confidentiality, integrity, and authenticity. Public Key Infrastructure (PKI) is a framework that manages digital keys and certificates, enabling secure communication and authentication over networks. Together, they underpin secure transactions, data protection, and trust in digital environments by facilitating encryption, digital signatures, and identity verification for users and devices.
💡 Key Takeaways
- Identify the primary goals of applied cryptography: confidentiality, integrity, and authenticity.
- Compare symmetric and asymmetric cryptography and their typical use cases.
- Explain PKI basics: digital certificates, certificate authorities, and key management for secure communication.
- Describe how digital signatures and PKI enable authentication and non-repudiation, and outline certificate lifecycle (issuance, revocation, expiration).
❓ Frequently Asked Questions
What is applied cryptography?
Applied cryptography is the practical use of cryptographic techniques (encryption, hashing, digital signatures) to protect data and communications in real-world systems.
What is Public Key Infrastructure (PKI) and what is it for?
PKI is the framework that manages keys and digital certificates, enabling secure communication, authentication, and data integrity through trusted identity verification.
What is a digital certificate and who issues it?
A digital certificate binds a public key to an identity and is issued by a trusted Certificate Authority after verifying the identity.
How do encryption and digital signatures differ?
Encryption protects confidentiality by making data unreadable without the key; a digital signature provides authenticity and integrity by signing data with a private key that others can verify with the public key.
What are CRLs and OCSP in PKI?
Certificate Revocation Lists (CRLs) and Online Certificate Status Protocol (OCSP) provide real-time checks to determine if a certificate has been revoked or remains valid.