High Quality Content by WIKIPEDIA articles! In cryptography, variably modified permutation composition, or VMPC, is a technology designed by Bartosz Zoltak, presented in 2004 at an international cryptography conference for fast software encryption in Delhi, India. The core of the technology is the VMPC one-way function, which is probably the simplest known function that cannot be inverted. The function is applied in an encryption algorithm known as the VMPC stream cipher. The cipher is efficient in software implementations and appears to offer better security than the still very popular RC4 stream cipher, for both the encryption process and the key scheduling algorithm. The best-known attack against VMPC is a distinguishing attack by Alexander Maximov, which can distinguish the keystream generated by VMPC from a random data stream after observing about 2^54 bytes (approximately 18 million gigabytes). Distinguishing attacks, however, do not cause a direct threat to the secrecy of the encrypted data or the cryptographic key.

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