Block symmetric ciphers are one of the most important components modern information security systems. At same time, in addition to structure applied block cipher, cryptographic strength and performance protection system is largely determined by encryption mode. In high high-quality destruction statistics, modes should also protect encrypted from occurred or intentionally introduced errors. this...

A convertible authenticated encryption scheme allows the signer to create a valid authenticated ciphertext such that only the specified receiver can simultaneously recover and verify the message. To protect the receiver’s benefit of a later dispute on repudiation, the receiver has the ability to convert the signature into an ordinary one that can be verified by anyone. However, the previous pro...

Real-world applications of authenticated encryption often require the encryption to be computable online, e.g. to compute the ith block of ciphertext after having processed the first i blocks of plaintext. A significant line of research was dedicated to identifying security notions for online authenticated encryption schemes, that capture various security goals related to real-life scenarios. F...

It was long thought that symmetric cryptography only mildly affected by quantum attacks, and doubling the key length sufficient to restore security. However, recent works have shown Simon’s period finding algorithm breaks a large number of MAC authenticated encryption algorithms when adversary can query MAC/encryption oracle with superposition messages. In particular, OCB mode is broken in this...

Authenticated encryption schemes allow the signer to generate an authenticated ciphertext such that only the designated recipient has the ability to recover the message and verify its corresponding signature. It can be seen that authenticated encryption schemes are applicable to lots of E-Commerce applications like credit card transactions, since these schemes simultaneously fulfill the securit...