![]() ![]() In this case, the private key is attached to the software or ISO Image, contrary to the operation described previously. PGP creates a digital signature, for example, for an ISO image using DSA or RSA algorithms. Both private key and hash can be decrypted using the public key. This is achieved through digital signature, which can be done with PGP.įirst, PGP generates a hash that is encrypted with the private key. PGP is also used to check packages’ integrity. ![]() The following chart flow shows the whole process: To be more technical, before the symmetric key is applied, the data is also compressed before being encrypted with the symmetric key and public key. With the public key, the sender does two things: first generates the symmetric encryption to protect the data, and then it applies asymmetric encryption, which does not encrypt the data itself, but the symmetric key, which protects the data. Symmetric encryption is applied when the public key is used to encrypt the protected data. But its disadvantage is it can’t encrypt large amounts of data, and that’s why PGP implements both of them. ![]() The advantage of asymmetric encryption is the simplicity to exchange keys. So even if an attacker manages to intercept the message without the private key, he is unable to see the message content. The information is encrypted using the public key, and decrypted using the private key. Only his private key can decrypt the message you encrypted using his public key. If you take his public key to encrypt a message to him, he will be able to decrypt the message using his private key. The issuer of the public key below also issued a private PGP key since they are generated in the same process. This PGP public key can be decrypted only with a specific private PGP key. The image below depicts a PGP public key. This tutorial explains easily how PGP works and how to verify PGP signatures. PGP is not only used to secure information from cyber threats but also to check file integrity. PGP complements symmetric-key with asymmetric-key algorithms, making this software a hybrid cryptographic system, often called hybrid cryptosystem. PGP (Pretty Good Privacy) is a public key-based cryptography program. ![]()
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