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Applications of Cryptography in IT
Data Encryption:

Protects sensitive data (e.g., personal information, financial details) during storage and transmission.
Secure Communication:

Ensures privacy in protocols like HTTPS, VPNs, and email encryption (e.g., PGP).
Authentication:

Uses digital certificates (PKI) to verify identities in online systems.
Blockchain Technology:

Cryptographic techniques like hashing and digital signatures ensure the immutability and security of blockchain transactions.
Digital Signatures:

Verifies the authenticity and integrity of digital documents or software.
Password Protection:

Hashing algorithms secure stored passwords in databases.
Secure Software Updates:

Validates the authenticity of updates using cryptographic signatures.