If you are selecting 128 bits for encryption, then the secret key must be of 16 bits long and 24 and 32 bits forġ92 and 256 bits of key size respectively. Hence, you must always use an IV of 128 bits (16ĪES provides 128 bit, 192 bit and 256 bit of secret key size for encryption. When a symmetric cipher mode requires an IV, the length of the IV mustīe equal to the block size of the cipher. The AES algorithm has a 128-bit block size, regardless of whether you key length isĢ56, 192 or 128 bits. If no IV is entered then default will be used here for CBC mode and that defaults to a Hence, it provides more robust encryption as compared to ECB mode,īut it is a bit slower as compared to ECB mode. Plain text blocks are encrypted into dissimilar cipher text blocks. It requires IV to make each message unique meaning the identical The input plain text will be divided into blocks and each block will beĮncrypted with the key provided and hence identical plain text blocks are encrypted intoĬBC(Cipher Block Chaining) mode is highly recommended, and it is an advanced form of block cipher encryption. Different Modes of AES EncryptionĪES offers 2 different modes of encryption - ECB and CBC modes.ĮCB(Electronic Code Book) is the simplest encryption mode and does not require IVįor encryption. Now choose the block cipher mode of encryption. For encryption, you can either enter the plain text, password, an image file or a.

Block cipher decryption tool