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It is possible to decrypt the message without possessing the key but, for a well-designed encryption scheme, considerable computational resources and skills are required. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients but not to unauthorized users.
In addition to providing encryption and authentication — features also provided by typical public-key cryptography suites, such as PGP, GnuPG, and X.509 — OTR also offers some less common features: Forward secrecy Messages are only encrypted with temporary per-message AES keys, negotiated using the Diffie–Hellman key exchange protocol.
Password-authenticated key exchange (PAKE) is a method in which two or more parties, based only on their knowledge of a shared password, [1] establish a cryptographic key using an exchange of messages, such that an unauthorized party (one who controls the communication channel but does not possess the password) cannot participate in the method ...
In a symmetric-key system, Bob knows Alice's encryption key. Once the message is encrypted, Alice can safely transmit it to Bob (assuming no one else knows the key). In order to read Alice's message, Bob must decrypt the ciphertext using which is known as the decryption cipher, :
The encrypting procedure is varied depending on the key, which changes the detailed operation of the algorithm. A key must be selected before using a cipher to encrypt a message. Without knowledge of the key, it should be extremely difficult, if not impossible, to decrypt the resulting ciphertext into readable plaintext.
"Encryption is your friend, whether it is on text messaging or if you have the capacity to use encrypted voice communications, even if the adversary is able to intercept the data, if it is ...
There will be a lock next to the timestamp on each message to indicate the encryption is on. But there's a weakness. When iPhone and Android users text each other, the messages are encrypted only using Rich Communication Services, an industry standard for instant messaging that replaces the older SMS and MMS standards.
Streaming modes of operation can encrypt and decrypt messages of any size and therefore do not require padding. More intricate ways of ending a message such as ciphertext stealing or residual block termination avoid the need for padding. A disadvantage of padding is that it makes the plain text of the message susceptible to padding oracle ...