Cryptography: Public-key Encryption & Digital Signature
History Public-key encryption makes key-management much easier. It was invented in 1976 by two Stanford mathematicians, Whitfield Diffie and Martin Hellman. Their discovery can be phrased simply:...
View ArticleGPG: Encryption, Decryption & Digital Signature with Public & Private Key [A...
GNU Privacy Guard (GnuPG or GPG) is a free cryptographic software that can secure data transfer and communication between two parties by encrypting, signing and verifying data. Public Key Cryptography...
View ArticleCryptography: Verify file integrity with md5 hash checksum
Checksum is used to verify the data integrity of files. It can be used to detect errors while transmitting data between devices or over the internet. The checksum functions as a digital fingerprint of...
View ArticleGPG: Remove keys from your public keyring?
Your public keyring becomes a long list after you go on importing other peoples’ keys into your system. Later on you might feel to delete some of them which are unnecessary. You can do so (delete keys...
View ArticleGPG: Revoking your public key and notifiying key-server
If you lost your private key then your public key becomes useless because you will not be able to decrypt any encrypted message sent to you. You need to revoke your public key and let other users know...
View ArticleGPG: How to change/edit Private Key Passphrase?
You might forget your GPG private key’s passphrase. You need your private key’s passphrase in order to decrypt an encrypted message or document which is encrypted using your public key. So, if you lost...
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