Abstract :
In
cryptography and computer security, a man-in-the middle attack (often
abbreviated to MITM, Mitm, MIM, Mim attack or MITMA) is an attack where the
attacker security relays and possibly alters the communication between two
parties who believe they are directly communicating with each other. Man-in-the
middle attack can be thought about through a chess analogy; mallory who barely
knows how to play chess, claims that she can play two grandmasters
simultaneously and either win one game or draw both. She waits for the first
grandmaster to make a more and then makes this same move against the second
grand master. When the second grandmaster responds, mallory makes the same
plays the entire game this way and cannot lose. A man in the middle attack is a
similar strategy an can be used against many cryptographic protocols.
One example
of man-in-the middle attacks is active caves dropping, in which the attacker
makes independent connections with the victims and relays messages b/w them to
make believe they are talking directly to each other over a private connection,
when in fact the entire conversation is controlled by the attacker. The
attacker must be able to intercept all relevant massager passing b/w the two
victims and object new ones. This is straight forward in many circumstance for
example, an attacker within reception range of an unencrypted wi-fi wireless
access point can insert himself as a man- in the middle.
Padding
oracle attack
In
cryptography, a padding oracle attack is an attack which is performed using the
padding of a cryptographic message. In cryptography, variable length plamtext
message often have to be padded (expanded) to be compatible with the underlying
cryptographic primitive. Cryptographic primitive are well established,
low-level cryptographic algorith ms that are frequently used to build
cryptographic protocols for computer security systems. These routines include,
bub are not limited to, one-way hash functions and encryption function. The
attack relies on having a “padding oracle” who freely responds to queries about
whether a message is correctly padded or not padding oracle attacks are mostly
associated with CBC mode decryption used within block ciphers.
Symmetric
cryptography
In
symmetric cryptography, l the padding oracle attack can be applied to the CBC
mode of operation, where the “oracle” (usually a server) leaks date about
whether the padding of an encrypted message is correct or not. Such date can
allow attackers to decrypt (and sometimes encrypt) messages through the oracle
using the oracle’s key.
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