hight_dec {hightR}

Perform decryption using HIGHT.

Description

HIGHT (HIGh security and light weigHT) is a symmetric key block cipher algorithm designed for use in resource-constrained environments such as embedded systems and wireless sensor networks. Outputs 64-bit ciphertext from 128-bit master key and 64-bit plaintext. This process can be repeated multiple times.

Usage

hight_dec(C, MK, mode, IV = NULL, output = "int")

Arguments

C

Encrypted plaintext by HIGHT.

MK

Master Key. This is used to encrypt other keys that are used to encrypt and decrypt data. This should be typically kept secret and is only accessible to authorized users who need to use it for encryption and decryption operations. It should have a length of 16 and must have a value from 0 to 255.

mode

Please select one from 'ecb'(Electric CodeBook mode),'cfb'(Cipher FeedBack mode),'cbc'(Cipher Block Chaining mode),'ofb'(Output FeedBack mode).

IV

Initialization Vector. The IV is usually generated randomly and is different for each encryption operation. It is combined with the encryption key to produce a unique key for each encryption operation. Its length must be equal to 8, which is a unit of cryptographic block, and the value range must also have a value from 0 to 255. This parameter will be ignored in ECB mode.

output

Support 'hex'(e.g. '0x66') string or 'int'(e.g. 102) for output format.

Value

Returns a numeric vector decrypted by the HIGHT algorithm.

References

Hong, D., Sung, J., Hong, S., Lim, J., Lee, S., Koo, B. S., ... & Chee, S. (2006). HIGHT: A new block cipher suitable for low-resource device. In Cryptographic Hardware and Embedded Systems-CHES 2006: 8th International Workshop, Yokohama, Japan, October 10-13, 2006. Proceedings 8 (pp. 46-59). Springer Berlin Heidelberg.

Examples

# Encryption and Decryption (CBC mode)
MK = c(0x88, 0xE3, 0x4F, 0x8F, 0x08, 0x17, 0x79, 0xF1,
       0xE9, 0xF3, 0x94, 0x37, 0x0A, 0xD4, 0x05, 0x89)
IV = c(0x26, 0x8D, 0x66, 0xA7, 0x35, 0xA8, 0x1A, 0x81)
P = c(0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07)
C = hight_enc(P,MK,mode = 'CBC', IV, output='int')
hight_dec (C,MK , mode = 'CBC', IV, output = 'int')

# Check decrypted text is same with the Plaintext
hight_dec (C, MK , mode = 'CBC', IV, output = 'int')==P