Скачать или смотреть What is Digital Signature | Demo | Cryptography Essentials | Encryption, Signatures and Hashing

What is Digital Signature. What is the need for digital Signature. How to digitally sign the documents. How to verify digital signature.

Encryption: It is one of the most used technique for security. Encryption works by converting messages into a format that can be used only by intended users. Three major types of encryption technologies are employed
one way hash
symmetric encryption
asymmetric encryption

One Way Hash: It operates in one direction only i.e you can encrypt but can not decrypt. If we are using the same key on the same data then same hash will get generated. If the data has got changed then hash generated will be different. The hashes are used for storing passwords. We can use hashes to determine whether the data has changed or not.

Symmetric Encryption: I this, the same key is used for encryption/decryption, algorithm is fast. The distribution of keys is a major problem area. if the keys gets compromised, any one can read the data or send bogus
messages.

Asymmetric Encryption (Public/Private Key Based Encryption): In this two keys, public and private are generated. Any key can encrypt but only other key can decrypt. The key distribution is not a big problem but it is slower.

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