Cryptography is the science of encryption and decryption, which has been around for years and is a vast topic.
Cryptography is explained using a block of wood and a strip of paper to convey a message, emphasizing the importance of using the correct size block to ensure the letters close and come together again when wrapped around it.
Cryptography uses encryption and decryption methods, like the Caesar cipher, to protect information, but modern technology makes it easier to decrypt encrypted text.
Cryptography involves encrypting and decrypting texts and files using symmetrical encryption, but alternative methods like time delays or using different keys for each message are used for added security due to the vulnerability of the key being easily cracked.
Asymmetric encryption is a method where both the sender and receiver have different keys, allowing for secure communication without the need for a shared key.
Person b has a private key and public keys that can be accessed by anyone, and when person b writes a letter or sends pictures, they can use the public key to encrypt the message, ensuring secure communication.
Asymmetrical encryption uses a public key to encrypt and a private key to decrypt messages, while symmetrical encryption can be used to send codes securely.
Cryptography is a vast topic, but the speaker briefly explains the difference between symmetrical and asymmetrical encryption and hints at an upcoming video on email encryption.
This article is a summary of a YouTube video "Kryptographie - Was ist das?" by Takiry